stanford prison experiment movie quotes

30 Best The Stanford Prison Experiment Quotes With Image

Introduction

5 key lessons from the stanford prison experiment, 30 best the stanford prison experiment quotes, related quotes.

• Create account
• Contributions

The Stanford Prison Experiment (film)

The Stanford Prison Experiment is a 2015 film about twenty-four male students out of seventy-five who are selected to take on randomly assigned roles of prisoners and guards in a mock prison situated in the basement of the Stanford psychology building. The participants adapted to their roles well beyond expectations, as the guards enforced authoritarian measures and ultimately subjected some of the prisoners to psychological torture . Many of the prisoners passively accepted psychological abuse and, at the request of the guards, readily harassed other prisoners who attempted to prevent it.

Dr. Philip Zimbardo

• This experiment... is over.

Daniel Culp/Prisoner 8612

• You have no right to fuck with my head!

Peter Mitchell/Prisoner 819

• Blow it out your ass, Mr. Correctional Officer!
• It's easy for you to say, 'Oh, I wouldn't have acted that way, but you don't know. That's - that's the truth. You don't know. And now, I know what I'm capable of, and it hurts.
• Billy Crudup - Dr. Philip Zimbardo
• Michael Angarano - Christopher Archer/"John Wayne" Guard
• Ezra Miller - Daniel Culp/Prisoner 8612
• Tye Sheridan - Peter Mitchell/Prisoner 819
• Thomas Mann - Prisoner 416
• Miles Heizer - Marshal Lovett
• Keir Gilchrist - John Lovett
• Johnny Simmons - Jeff Jansen
• Moises Arias - Anthony Caroll
• Olivia Thirlby - Christina Maslach
• Nelsan Ellis - Jesse Fletcher
• James Wolk - Mike Pennyl
• Gaius Charles - Paul Vogel
• Logan Miller - Jerry
• James Frecheville - Townshend
• Ki Hong Lee - Gavin Chan
• Matt Bennett - Kyle Parker
• Jack Kilmer - Jim
• Nicholas Braun - Karl Vandy
• Brett Davern - Hubbie Whitlow
• Jesse Carere - Paul

External links

• The Stanford Prison Experiment quotes at the Internet Movie Database
• The Stanford Prison Experiment at Rotten Tomatoes
• The Stanford Prison Experiment at Metacritic

• 2010s American films
• Films based on true stories
• Prison films
• Psychological thriller films
• Sundance Film Festival award winners
• Films set in California
• Stanford University

Philip Zimbardo reflects on ‘The Stanford Prison Experiment’ movie

Today, Philip Zimbardo, professor emeritus of psychology at Stanford, will see the story of his famously controversial Stanford Prison Experiment unfold on the big screen.

Conducted in 1971, the experiment simulated a prison environment with a group of 22 male college students. The young men, hand-picked for their physical and mental maturity, among other factors, were randomly assigned the role of “prisoner” or “guard.” While the students were specifically instructed against the use of physical punishment, they were given no further instructions. Throughout the six-day study , half of the prisoners suffered from “extreme emotional depression, crying, rage, and acute anxiety” and had to be excused from the experiment.

Since the study was conducted, Zimbardo has written “The Lucifer Effect,” a book in which he discusses the gradual changes experienced within the subjects and himself throughout the experiment. The research has been widely studied by psychology students and beyond, serving as a controversial but poignant example of the effect of a prison environment.

With “The Stanford Prison Experiment” set to premiere today, Zimbardo spoke with The Daily about the original study, as well as his thoughts about the motion picture.

The Stanford Daily (TSD): What were your initial expectations for the original experiment?

Philip Zimbardo (PZ): [We wanted to expand on] Milgram’s experiment on obedience through authority, in which he showed that situational factors can get good people to do bad things… Our study was a follow-up of that, in which we focus less on powerful authority and obedience…

In the earlier research – in most psychological research – it [the study] only goes for a single hour. We wanted to observe the gradual transformation of people into their character, into their role… What’s dramatic about the research – and now what’s dramatic about the movie – is that you see for the first time character transformations – people becoming their role, becoming guards, becoming prisoners – in a relatively short time.

TSD: Why did you decide to conduct the study with college-age males?

PZ: I wanted to have bright, intelligent college students. And unlike Milgram’s study, we gave them personality tests. We only picked the most normal and healthy. The bottom line is, I want to say, here we have normal, intelligent, bright, college students who should understand things about [themselves]. Even more than ordinary, uneducated people. And the point is, it works for them as well as for the ordinary men in Milgram’s study.

TSD: In some of the interviews after the experiment, students explained that the prison became more than just an experiment, that they really grew into their roles as prisoners and guards. Did you also grow into your role as prison superintendent? How did this it affect your research?

PZ: Oh, absolutely. I made the mistake of playing two roles simultaneously. One role was principal investigator of the research project, and in that role I am objective; I am distant; I am emotionally neutral. But then I made the mistake of also being the prison superintendent, and my undergraduate assistant David Chassey played the role of the warden, and my two graduate students…played the two attendants. But we all had a prison-life role to play.

Over time, hour-by-hour, day-by-day, I fell into that role, and in that role I observed guards brutalizing prisoners – in some cases sadistically… And I did not stop it. The only thing I stopped was physical force, but I didn’t stop psychological force, which, in the long run is much worse. I had become, without my awareness, the indifferent superintendent of the Stanford Prison Experiment. And in my book “The Lucifer Effect,” I write about it in great detail – that this was a mistake I made. I should have had someone else play that role.

PZ: When I finished this study, I wrote a few articles about it, because it was really, to me, not a big deal… And then what happened was Abu Ghraib in 2004 – there were obvious parallels with the prison study. Military guards put bags over prisoners’ heads, stripped them naked, humiliated them, just as our guards had done. And so I became an excellent witness to one of those military guards and got to know everything about that horrendous military situation in Iraq. And then I decided I should really go back and review what happened in the Stanford Prison Study, which was 30 years earlier.

And so what I did is I looked at 12 hours of our videotape along with two students who didn’t know anything about this study… And what I decided to do is write a book in which we basically detail what happened in the study. We basically have a chapter of each day, and of course a chapter of setting it [the experiment] up, and other chapters on other things and other kinds of evil situations. My book, “The Lucifer Effect,” [has] been a great success. It’s been in 20 different languages around the world; it’s being used not only by college students and psychologists but in military situations and even in mental hospitals.

TSD: Was there a particular time when your role started to shift from principal investigator to prison superintendent, or was it gradual?

PZ: It’s totally gradual. The point is that we all – I mean I lived there, I slept in my office – hadn’t noticed [the changes] at all. That is, we lived the experiment.

The other problem was we – we meaning my research team – were really not prepared for the intensity an experiment that goes 24/7. Because there are endless logistical things to do – prisoners have to be fed morning, lunch, evening. In order to make it realistic we had parole board hearings two times, with an ex-convict heading it. The secretaries had visiting days two times, with parents, boyfriends, girlfriends. We had a visiting by a prison chaplain…

But the changes are gradual. The changes occur, as I said, a little bit more each day. It’s not a single dramatic thing.

TSD: You mentioned that your two-week study was terminated after just six days; why did you make the decision to conclude the study at the point that you did?

PZ: It’s a critical dramatic instance of heroic action by a young woman, who brought me to my senses…On Thursday night, one of those former graduate students [coming to help with the study], a young woman named Christina Maslach [Ph.D. ’71] – she had been my graduate student at Stanford and also my teaching assistant, and she had just graduated in June – had gotten a job at Berkeley as an assistant professor in psychology and was on her way [to Stanford]…

We had just decided in addition in the beginning of August that we would move in together. We were having a romantic relationship…  So she happened to be at Stanford on Thursday working in the library, and contacted me and said, “Hey, can we get together for dinner at the end of the night shift?” And I said, “Sure, why don’t you come down and just check out what’s happening.”

And she comes down and observes guards brutalizing prisoners with bags over their head, yelling, screaming, chaining their legs together, and when I looked at what was happening on the monitor it was nothing more than the 10 o’clock toilet shift – because 10 o’clock was the last time prisoners could go to a real toilet… She begins to tear up, and runs out and says “I can’t look at this”…

I’m arguing about why this is such an important study, and then she [asks], how could I not see the suffering that was so obvious to her? And if this was the real me, because what she had known me before – the professor, who was a caring, loving teacher… I’m not sure I want to continue my romantic relationship with you. And at that point it was really stunning because it was exactly what I needed to shake me loose from my fantasy, from my craziness… At this point it’s like 11 o’clock at night, and I say, “All right, I’m going to end the study tomorrow… ” We ended the study on Friday, the next day.

TSD: Shifting focus from the actual study to the film that’s coming out, how accurately do you think the film portrays your experiment?

PZ: It’s a remarkably accurate portrayal. Now, the only issue of course is they’re compressing six days into two hours – it is a two hour film. So in fact, they had to leave out many traumatic scenes. There are no scenes that were put in that didn’t happen in the real study. There were no scenes that had to be put in for the drama. If anything, they left out a lot of what I consider powerful scenes, which they actually had in and it just went too long so they had to cut it out. I’d say it’s roughly 90 percent accurate.

Now in addition, when I was writing “The Lucifer Effect,” I was sending to the scriptwriter Tim Talbott all of the dialogue between prisoners and guards. So in the movie almost all of what the guards say to prisoners, prisoners say to guards, came exactly from “The Lucifer Effect” (and I got a screen citation).

TSD: What was your involvement with the making of the movie?

PZ: From the beginning, I was the consultant. I reviewed the script; I made significant changes in the script; I contributed to the script. And I was on the set a couple of days. Unfortunately, I couldn’t be there all the time because I was in Europe. And even when the film was shown at Sundance, there were several parts of the movie which were just wrong psychologically, and then also we added the screen credits. Several things which are now in the movie.

TSD: There have been several documentaries and informational videos made about the experiment, but this is more of a motion picture than a documentary. How do you think the dramatization of the experiment affects the events and conclusions that are presented? Are they easier to relate to for the audience?

PZ: Our movie sticks essentially to the facts… So the movie, then, is a dramatic recreation. It’s dramatic in that it’s highlighting some things and not getting into details about something else. But it has the visiting days. It has the parole board hearing. It has at least one scene of the police arrest. It has the interaction of me and my staff making group decisions about what we should do with certain prisoners. At least more than half of the movie is just prisoner and guard interaction with no one else present.

What’s dramatic is, the audience, in looking at the movie – it’s as if they’re looking through a one-way screen, as we were doing. They are taking the place of the observers looking at the drama unfolding. But they are also observing the observers. Observing the changes in me and my graduate students as these things unfold.

I think it’s a unique movie; it’s the only movie I know where the whole movie is about a psychological experiment.

TSD: If you could change something about the movie, what would you change?

PZ: The confrontation I had with Christina is the reason we ended the study – and it makes her a hero. Because in doing what she was doing, she was willing to say two things. She doesn’t know these boys, doesn’t know anything about them. But she’s just saying “I see human suffering, and you are responsible. I don’t want to have a relationship with somebody who could do that… ” That’s heroic. Heroes defend their moral cause aware of the risk.

But they didn’t use that to end the movie. They had a confrontation, and then I go down to the dungeon, and I’m looking at the video, and the video is the worst thing that happens… They wanted a traumatic scene, wanted to have the biggest traumatic impact – which it does… And then I go down, I enter the yard and say, “Okay, this study is over.” So the way the movie does, it doesn’t give her the heroic status that she deserves.

TSD: You mentioned that the audience will be encased in the basement as well. What do you hope viewers will take away from that experience?

PZ: It’s: What kind of guard would I have been if I was in that study? Would I have been a cruel guard; would I have been a good guard; would I have stopped what the bad guards did? What kind of prisoner would I have been? Would I have been defiant? Would I have stood up for my rights? Would I have helped other prisoners who were breaking down? If I would have been the prison superintendent, what would I have done to make the situation not erupt so horribly?

Essentially, we would like them to identify with the prisoners, the guards and me and my staff. And then also the question is: Would you have allowed it to go the second week, or would you end it earlier?… The point is to reflect. We’ve got all this stuff happening, prison riots in New York and Rikers Island – it’s really about abuse of power. Abuse of police power we see everywhere.

This interview has been condensed and edited.

Contact Lea Sparkman at 16lsparkman ‘at’ castilleja.org.

Login or create an account

Join the stanford daily, priority application deadline saturday, october 5th.

• NEWS, ARTS, SPORTS
• OPINIONS, HUMOR, CREATIVE NONFICTION
• PHOTO, VIDEO, GRAPHICS, PODCASTS
• MAGAZINE, TECH, CROSSWORD

Find anything you save across the site in your account

The Real Lesson of the Stanford Prison Experiment

On the morning of August 17, 1971, nine young men in the Palo Alto area received visits from local police officers. While their neighbors looked on, the men were arrested for violating Penal Codes 211 and 459 (armed robbery and burglary), searched, handcuffed, and led into the rear of a waiting police car. The cars took them to a Palo Alto police station, where the men were booked, fingerprinted, moved to a holding cell, and blindfolded. Finally, they were transported to the Stanford County Prison—also known as the Stanford University psychology department.

They were willing participants in the Stanford Prison Experiment, one of the most controversial studies in the history of social psychology. (It’s the subject of a new film of the same name—a drama, not a documentary—starring Billy Crudup, of “Almost Famous,” as the lead investigator, Philip Zimbardo. It opens July 17th.) The study subjects, middle-class college students, had answered a questionnaire about their family backgrounds, physical- and mental-health histories, and social behavior, and had been deemed “normal”; a coin flip divided them into prisoners and guards. According to the lore that’s grown up around the experiment, the guards, with little to no instruction, began humiliating and psychologically abusing the prisoners within twenty-four hours of the study’s start. The prisoners, in turn, became submissive and depersonalized, taking the abuse and saying little in protest. The behavior of all involved was so extreme that the experiment, which was meant to last two weeks, was terminated after six days.

Less than a decade earlier, the Milgram obedience study had shown that ordinary people, if encouraged by an authority figure, were willing to shock their fellow-citizens with what they believed to be painful and potentially lethal levels of electricity. To many, the Stanford experiment underscored those findings, revealing the ease with which regular people, if given too much power, could transform into ruthless oppressors. Today, more than forty-five years later, many look to the study to make sense of events like the behavior of the guards at Abu Ghraib and America’s epidemic of police brutality. The Stanford Prison Experiment is cited as evidence of the atavistic impulses that lurk within us all; it’s said to show that, with a little nudge, we could all become tyrants.

And yet the lessons of the Stanford Prison Experiment aren’t so clear-cut. From the beginning, the study has been haunted by ambiguity. Even as it suggests that ordinary people harbor ugly potentialities, it also testifies to the way our circumstances shape our behavior. Was the study about our individual fallibility, or about broken institutions? Were its findings about prisons, specifically, or about life in general? What did the Stanford Prison Experiment really show?

The appeal of the experiment has a lot to do with its apparently simple setup: prisoners, guards, a fake jail, and some ground rules. But, in reality, the Stanford County Prison was a heavily manipulated environment, and the guards and prisoners acted in ways that were largely predetermined by how their roles were presented. To understand the meaning of the experiment, you have to understand that it wasn’t a blank slate; from the start, its goal was to evoke the experience of working and living in a brutal jail.

From the first, the guards’ priorities were set by Zimbardo. In a presentation to his Stanford colleagues shortly after the study’s conclusion, he described the procedures surrounding each prisoner’s arrival: each man was stripped and searched, “deloused,” and then given a uniform—a numbered gown, which Zimbardo called a “dress,” with a heavy bolted chain near the ankle, loose-fitting rubber sandals, and a cap made from a woman’s nylon stocking. “Real male prisoners don't wear dresses,” Zimbardo explained, “but real male prisoners, we have learned, do feel humiliated, do feel emasculated, and we thought we could produce the same effects very quickly by putting men in a dress without any underclothes.” The stocking caps were in lieu of shaving the prisoner’s heads. (The guards wore khaki uniforms and were given whistles, nightsticks, and mirrored sunglasses inspired by a prison guard in the movie “Cool Hand Luke.”)

Often, the guards operated without explicit, moment-to-moment instructions. But that didn’t mean that they were fully autonomous: Zimbardo himself took part in the experiment, playing the role of the prison superintendent. (The prison’s “warden” was also a researcher.) /Occasionally, disputes between prisoner and guards got out of hand, violating an explicit injunction against physical force that both prisoners and guards had read prior to enrolling in the study. When the “superintendent” and “warden” overlooked these incidents, the message to the guards was clear: all is well; keep going as you are. The participants knew that an audience was watching, and so a lack of feedback could be read as tacit approval. And the sense of being watched may also have encouraged them to perform. Dave Eshelman, one of the guards, recalled that he “consciously created” his guard persona. “I was in all kinds of drama productions in high school and college. It was something I was very familiar with: to take on another personality before you step out on the stage,” Eshelman said. In fact, he continued, “I was kind of running my own experiment in there, by saying, ‘How far can I push these things and how much abuse will these people take before they say, ‘Knock it off?’ ”

Other, more subtle factors also shaped the experiment. It’s often said that the study participants were ordinary guys—and they were, indeed, determined to be “normal” and healthy by a battery of tests. But they were also a self-selected group who responded to a newspaper advertisement seeking volunteers for “a psychological study of prison life.” In a 2007 study, the psychologists Thomas Carnahan and Sam McFarland asked whether that wording itself may have stacked the odds. They recreated the original ad, and then ran a separate ad omitting the phrase “prison life.” They found that the people who responded to the two ads scored differently on a set of psychological tests. Those who thought that they would be participating in a prison study had significantly higher levels of aggressiveness, authoritarianism, Machiavellianism, narcissism, and social dominance, and they scored lower on measures of empathy and altruism.

Moreover, even within that self-selected sample, behavioral patterns were far from homogeneous. Much of the study’s cachet depends on the idea that the students responded en masse, giving up their individual identities to become submissive “prisoners” and tyrannical “guards.” But, in fact, the participants responded to the prison environment in all sorts of ways. While some guard shifts were especially cruel, others remained humane. Many of the supposedly passive prisoners rebelled. Richard Yacco, a prisoner, remembered “resisting what one guard was telling me to do and being willing to go into solitary confinement. As prisoners, we developed solidarity—we realized that we could join together and do passive resistance and cause some problems.”

What emerges from these details isn’t a perfectly lucid photograph but an ambiguous watercolor. While it’s true that some guards and prisoners behaved in alarming ways, it’s also the case that their environment was designed to encourage—and, in some cases, to require—those behaviors. Zimbardo himself has always been forthcoming about the details and the nature of his prison experiment: he thoroughly explained the setup in his original study and, in an early write-up , in which the experiment was described in broad strokes only, he pointed out that only “about a third of the guards became tyrannical in their arbitrary use of power.” (That’s about four people in total.) So how did the myth of the Stanford Prison Experiment—“Lord of the Flies” in the psych lab—come to diverge so profoundly from the reality?

In part, Zimbardo’s earliest statements about the experiment are to blame. In October, 1971, soon after the study’s completion—and before a single methodologically and analytically rigorous result had been published—Zimbardo was asked to testify before Congress about prison reform. His dramatic testimony , even as it clearly explained how the experiment worked, also allowed listeners to overlook how coercive the environment really was. He described the study as “an attempt to understand just what it means psychologically to be a prisoner or a prison guard.” But he also emphasized that the students in the study had been “the cream of the crop of this generation,” and said that the guards were given no specific instructions, and left free to make “up their own rules for maintaining law, order, and respect.” In explaining the results, he said that the “majority” of participants found themselves “no longer able to clearly differentiate between role-playing and self,” and that, in the six days the study took to unfold, “the experience of imprisonment undid, although temporarily, a lifetime of learning; human values were suspended, self-concepts were challenged, and the ugliest, most base, pathological side of human nature surfaced.” In describing another, related study and its implications for prison life, he said that “the mere act of assigning labels to people, calling some people prisoners and others guards, is sufficient to elicit pathological behavior.”

Zimbardo released video to NBC, which ran a feature on November 26, 1971. An article ran in the Times Magazine in April of 1973. In various ways, these accounts reiterated the claim that relatively small changes in circumstances could turn the best and brightest into monsters or depersonalized serfs. By the time Zimbardo published a formal paper about the study , in a 1973 issue of the International Journal of Crim__i__nology and Penology , a streamlined and unequivocal version of events had become entrenched in the national consciousness—so much so that a 1975 methodological critique fell largely on deaf ears.

Forty years later, Zimbardo still doesn’t shy away from popular attention. He served as a consultant on the new film, which follows his original study in detail, relying on direct transcripts from the experimental recordings and taking few dramatic liberties. In many ways, the film is critical of the study: Crudup plays Zimbardo as an overzealous researcher overstepping his bounds, trying to create a very specific outcome among the students he observes. The filmmakers even underscore the flimsiness of the experimental design, inserting characters who point out that Zimbardo is not a disinterested observer. They highlight a real-life conversation in which another psychologist asks Zimbardo whether he has an “independent variable.” In describing the study to his Stanford colleagues shortly after it ended, Zimbardo recalled that conversation: “To my surprise, I got really angry at him,” he said. “The security of my men and the stability of my prison was at stake, and I have to contend with this bleeding-heart, liberal, academic, effete dingdong whose only concern was for a ridiculous thing like an independent variable. The next thing he’d be asking me about was rehabilitation programs, the dummy! It wasn’t until sometime later that I realized how far into the experiment I was at that point.”

In a broad sense, the film reaffirms the opinion of John Mark, one of the guards, who, looking back, has said that Zimbardo’s interpretation of events was too shaped by his expectations to be meaningful: “He wanted to be able to say that college students, people from middle-class backgrounds ... will turn on each other just because they’re given a role and given power. Based on my experience, and what I saw and what I felt, I think that was a real stretch.”

If the Stanford Prison Experiment had simulated a less brutal environment, would the prisoners and guards have acted differently? In December, 2001 , two psychologists, Stephen Reicher and Alexander Haslam, tried to find out. They worked with the documentaries unit of the BBC to partially recreate Zimbardo’s setup over the course of an eight-day experiment. Their guards also had uniforms, and were given latitude to dole out rewards and punishments; their prisoners were placed in three-person cells that followed the layout of the Stanford County Jail almost exactly. The main difference was that, in this prison, the preset expectations were gone. The guards were asked to come up with rules prior to the prisoners’ arrival, and were told only to make the prison run smoothly. (The BBC Prison Study, as it came to be called, differed from the Stanford experiment in a few other ways, including prisoner dress; for a while, moreover, the prisoners were told that they could become guards through good behavior, although, on the third day, that offer was revoked, and the roles were made permanent.)

Within the first few days of the BBC study, it became clear that the guards weren’t cohering as a group. “Several guards were wary of assuming and exerting their authority,” the researchers wrote. The prisoners, on the other hand, developed a collective identity. In a change from the Stanford study, the psychologists asked each participant to complete a daily survey that measured the degree to which he felt solidarity with his group; it showed that, as the guards grew further apart, the prisoners were growing closer together. On the fourth day, three cellmates decided to test their luck. At lunchtime, one threw his plate down and demanded better food, another asked to smoke, and the third asked for medical attention for a blister on his foot. The guards became disorganized; one even offered the smoker a cigarette. Reicher and Haslam reported that, after the prisoners returned to their cells, they “literally danced with joy.” (“That was fucking sweet,” one prisoner remarked.) Soon, more prisoners began to challenge the guards. They acted out during roll call, complained about the food, and talked back. At the end of the sixth day, the three insubordinate cellmates broke out and occupied the guards’ quarters. “At this point,” the researchers wrote, “the guards’ regime was seen by all to be unworkable and at an end.”

Taken together, these two studies don’t suggest that we all have an innate capacity for tyranny or victimhood. Instead, they suggest that our behavior largely conforms to our preconceived expectations. All else being equal, we act as we think we’re expected to act—especially if that expectation comes from above. Suggest, as the Stanford setup did, that we should behave in stereotypical tough-guard fashion, and we strive to fit that role. Tell us, as the BBC experimenters did, that we shouldn’t give up hope of social mobility, and we act accordingly.

This understanding might seem to diminish the power of the Stanford Prison Experiment. But, in fact, it sharpens and clarifies the study’s meaning. Last weekend brought the tragic news of Kalief Browder’s suicide . At sixteen, Browder was arrested, in the Bronx, for allegedly stealing a backpack; after the arrest, he was imprisoned at Rikers for three years without trial . (Ultimately, the case against him was dismissed.) While at Rikers, Browder was the object of violence from both prisoners and guards, some of which was captured on video . It’s possible to think that prisons are the way they are because human nature tends toward the pathological. But the Stanford Prison Experiment suggests that extreme behavior flows from extreme institutions. Prisons aren’t blank slates. Guards do indeed self-select into their jobs, as Zimbardo’s students self-selected into a study of prison life. Like Zimbardo’s men, they are bombarded with expectations from the first and shaped by preëxisting norms and patterns of behavior. The lesson of Stanford isn’t that any random human being is capable of descending into sadism and tyranny. It’s that certain institutions and environments demand those behaviors—and, perhaps, can change them.

The Stanford Prison Experiment

Students of high school or university psychology classes are probably familiar with the Stanford Prison Experiment. Run in 1971 at the behest of the U.S. Navy, the experiment intended to investigate the cause of conflict between guards and prisoners in military correctional facilities. Dr. Philip Zimbardo and his team chose 24 male Stanford students and divvied them up into guards and prisoners. Turning the basement of one of the student halls into a makeshift prison, Zimbardo placed his subjects under surveillance and watched as the prisoners became passive and the guards exhibited authority by way of sometimes sadistic psychological torture. Zimbardo ended the experiment 6 days into its 2-week run, mostly due to the objections of his fiancée. She felt Zimbardo had become an unhealthy part of his own experiment.

A documentary about this could potentially be fascinating, as some of the actual experiment exists on film. Unfortunately, “The Stanford Prison Experiment” is a dramatization, and no matter how much it may adhere to the well-documented specifics of Zimbardo’s work, it is a massive failure. It prefers to abstract the experiment from any psychological theories or details, opting instead to merely harp on endless, repetitive scenes of prisoner abuse. One particular guard, who thinks he’s Strother Martin in “ Cool Hand Luke ,” abuses the prisoners. The prisoners take the abuse, rebelling once or twice before becoming passive. Zimbardo glares at a TV screen doing nothing while his guards break the rules of the contract everybody signed at the outset. Repeat ad nauseum.

These scenes are supposed to shock the viewer, but they did not work for me, because I just didn’t care. The film reduces the entire experiment to a Dead Teenager movie whose slasher just roughs them up. Prisoners are referred to by numbers in order to strip them of their personal identities, and the film keeps them at this level of distance. We never get to know any subject outside of brief sketches, so the victims become disposable. Despite the best efforts of the actors on both sides of the law, the film is completely clinical in its depiction, striking the same note for over 2 hours. It gets real dull, real fast.

I didn’t care because this isn’t remotely like an actual prison; it’s a bunch of privileged kids playing dress-up for $15 a day. Even a priest Zimbardo hires as a prison chaplain tells the doctor “it’s good that these privileged kids experience prison life.” The actual reasons for the experiment (and its military involvement) are never expressed in Tim Talbott ’s screenplay, so the priest’s comment almost serves as the reason for these tests. And the film takes great pains to tell us that nobody in the experiment suffered “long term psychological damage” after it was abruptly cancelled. I’m sure someone who has experienced the harsh realities of actual prison life would feel relieved that these young men weren’t scarred.

The best scene in “The Stanford Prison Experiment” deals with an actual prisoner and serves to highlight my disdain for how the film trades emotion and details for exploitative shocks. The fantastic Nelsan Ellis (last seen in “ Get On Up ”) plays Jesse, an ex-con brought in by Zimbardo’s team as an expert witness to their proceedings. At a mock parole board hearing, Jesse rips into an inmate, treating him as inhumanely as possible while verbally shredding the inmate’s explanation for why he should be paroled. After the stunned inmate is sent back to his cell, Jesse reveals that he was recreating his own parole board treatment. He tells Zimbardo that playing the role of his own tormentor “felt good, and I hated that it did.” This, in a nutshell, is what the actual experiment sought to explore, that is, the nature of even the nicest human beings to commit evil. Jesse’s revelation, and the psychological toll it takes on him, is more effective than anything else the film conjures up. If only the movie had spent more time interacting with the Strother Martin-wannabe’s own thoughts rather than trudging him out only for sadism.

The film reduces Zimbardo to some kind of megalomaniac who doesn’t know what he is doing. This makes his research seem half-assed and unethical. He watches the guards strike the prisoners (a direct violation of the rules) and the film paints him as the biggest villain of all. He challenges anyone who questions his methods and authority, and at one point, he absurdly sits in a hallway like a low-rent Charles Bronson hoping for the return of a subject who might jeopardize his research. (In the actual case, Zimbardo simply moves the prison to a location unknown by the subject.) And though his intentions are to “feminize” the prisoners by giving them “dresses” that barely hide their genitalia, “The Stanford Prison Experiment” implies that Zimbardo’s sole reason for stopping the experiment was the moment when his guards forced the inmates into a gay sex pantomime. Violence and hog-tying inmates were OK, but none of that gay stuff, the movie seems to say.

Billy Crudup deserves some kind of medal for his attempt to breathe life into his one dimensional character, as do actors like Ezra Miller and Olivia Thirlby . But they are undermined by a poor script, horror movie-style music and ripe dramatizations that exist solely to make the viewer feel superior. I despise movies like this and “ Compliance ” because they pretend to say something profound about their scenarios but are, at heart, cynically manipulative trash designed to make audiences pat themselves on the back for not being “like those people.” Had we been forced to identify with anyone, prisoner or guard, the film might have achieved the palpable discomfort of forcing us to look at ourselves. That was one of the goals of the actual Stanford Prison Experiment. This movie just wants to superficially disturb, and it’s not even successful at that.

Odie Henderson

Odie “Odienator” Henderson has spent over 33 years working in Information Technology. He runs the blogs Big Media Vandalism and Tales of Odienary Madness. Read his answers to our Movie Love Questionnaire  here .

• Keir Gilchrist as John Lovett
• Tye Sheridan as Peter Mitchell - Prisoner 819
• Ezra Miller as Daniel Culp - Prisoner '8612'
• Moisés Arias as Actor
• Billy Crudup as Dr. Philip Zimbardo
• Gaius Charles as Banks
• Thomas Mann as Prisoner 416
• Michael Angarano as Christopher Archer
• Olivia Thirlby as Christina Zimbardo
• Nelsan Ellis as Jesse Fletcher
• Johnny Simmons as Jeff Jansen
• James Wolk as Penny

Director of Photography

• Jas Shelton
• Kyle Patrick Alvarez
• Tim Talbott

Leave a comment

Now playing.

I, The Executioner

The Apprentice

Daddy’s Head

Little Bites

House of Spoils

Memoir of a Snail

V/H/S/Beyond

Latest articles

Chaz Ebert, CEO of RogerEbert.com, Makes Directorial Debut with “Wellness Warrior”

Transcending Hell on Earth in Larisa Sheptiko’s “The Ascent”

Netflix’s “Nobody Wants This” Sadly Lives Up To Its Title

Fantastic Fest 2024: The Fall, The Birthday, Wake in Fright

The best movie reviews, in your inbox.

50 Years On: What We've Learned From the Stanford Prison Experiment

The experiment generated important research into unexplored territories..

Posted August 16, 2021 | Reviewed by Tyler Woods

• What Is Shyness?
• Take our Social Anxiety Test
• Find a therapist near me
• I developed 3 new areas of research after the Stanford prison experiment (SPE): good and evil, time perspective, and shyness.
• The SPE was closed down after 6 days because the "guards" became so brutal and as Superintendent, I was too caught up in my role.
• The Heroic Imagination Project teaches people how to be Everyday Heroes and take effective actions in challenging situations.

Fifty years ago this month I conducted a research experiment that could have been a blight to my career . Instead, what has become known as the Stanford prison experiment (SPE) drove me to extensively pursue the question: Why do good people do evil things? After three decades of research on this subject, I recorded my findings in The Lucifer Effect: Understanding How Good People Turn Evil (Random House, 2007).

But the SPE also led me to research three new topics that hadn’t previously been studied:

1) Heroism: Why, in difficult situations, some people heroically step forward to help others, oftentimes complete strangers, while others stand by and watch.

2) Time Perspective: The psychological time warp experienced by participants of the SPE—not knowing if it was day or night or what day it was—led to my research in people’s individual time perspectives and how these affect our lives.

3) Shyness : Rethinking shyness as a self-imposed psychological prison led me to conduct research on shyness in adults, and then create a clinic in the community designed to cure shyness.

The Experiment in a Nutshell

In August 1971, I led a team of researchers at Stanford University to determine the psychological effects of being a guard or a prisoner. The study was funded by the US Office of Naval Research as both the US Navy and the US Marine Corps were interested in the causes of conflict between military guards and prisoners. In the study, 24 normal college students were randomly assigned to play the role of guard or inmate for two weeks in a simulated prison located in the basement of the Stanford Psychology Department building. But the guards quickly became so brutal, and I had become so caught up in my role as Superintendent, that I shut down the experiment after only six days.

Challenging the Truth

There seem to be powerful silent barriers to dealing with new truths emanating from psychological laboratories and field experiments that tell us things about how the mind works, which challenge our basic assumptions. We want to believe our decisions are wisely informed, that our actions are rational, that our personal conscience buffers us against tyrannical authorities. Moreover, we want to believe in the dominating influence of our good character despite social circumstances. Yes, those personal beliefs are sometimes true, but often they are not, and rigidly defending them can get us in trouble individually and collectively. Let’s see how.

Denial and Finger Pointing

When we discover two or three ordinary American citizens administered extreme electric shocks to an innocent victim on the relentless commands of a heartless authority, we say, “no way, not me.” Yale University psychologist Stanley Milgram’s obedience to authority research has been in the public arena for decades, yet we ignore its message of the power of unjust authority in undercutting our moral conscience. Similarly, the SPE research made vivid the power of hostile situational forces in overwhelming dispositional tendencies toward compassion and human dignity. Still, many who insist on honoring the dominance of character over circumstance reject its situational power message.

In 2004, people around the world witnessed online photos of horrific actions of American Military Police guards in Iraq’s Abu Ghraib Prison against prisoners in their charge. It was portrayed as the work of a “few bad apples” according to military brass and Bush administration spokespeople. I publicly challenged this traditional focus on individual dispositions by portraying American servicemen as good apples that were forced to operate in a Bad Barrel (the Situation) created by Bad Barrel Makers (the System).

I became an expert witness in the defense of the Staff Sergeant in charge of the night shift, where all the abuses took place. In that capacity, I had personal access to the defendant, to all 1,000 photos and videos, to all dozen military investigations, and more. It was sufficient to validate my view of that prison as a replica of the Stanford prison experiment on steroids, and of my defendant, Chip Frederick, as really a Good Apple corrupted by being forced to function for 12 hours every night for many months in the worst barrel imaginable. My situation-based testimony to the military Court Martial hearings helped reduce the severity of his sentence from 15 years down to only four years.

The January 6, 2021 insurrection is a recent example of some Good Apples being corrupted by a Bad Barrel. In this case, the Bad Barrel is the insidiousness of fascism led by the former president and other fraudulent politicians as well as media personalities. These “leaders” have been generously dumping poison in the Barrel and over the Apples with lies that feed the Apples’ deepest fears.

“The Stanford Prison Experiment” Film

In 2015, The Stanford Prison Experiment was made into a film starring Billy Crudup as me and Olivia Thrilby as Christina Maslach, the whistle-blowing graduate student (whom I later married) who pointed out the experiment had gone awry and had changed me to such a degree that she didn’t know who I was anymore. Her personal challenge led me to end the study the next day. The film received two awards at the Sundance Film Festival: best screenwriting and best science feature.

The Stanford Prison Experiment movie enables viewers to look through the observation window as if they were part of the prison staff watching this remarkable drama slowly unfold, and simultaneously observe those observers as well. They are witnesses to the gradual transformations taking place, hour by hour, day by day, and guard shift by guard shift. Viewers see what readers of The Lucifer Effect book account can only imagine. As these young students become the characters inhabited in their roles and dressed in their costumes, as prisoners or guards, a Pirandellian drama emerges.

The fixed line between Good, like us, and Evil, like them, is relentlessly blurred as it becomes ever more permeable. Ordinary people soon slip into doing extraordinarily bad things to other people, who are actually just like them except for a random coin flip. Other healthy people soon get sick mentally, being unable to cope with the learned helplessness imposed on them in that unique, unfamiliar setting. They do not offer comfort to their buddies as they break down, nor do those who adopt a “good guard” persona ever do anything to limit the sadistic excesses of the cruel guards heading their shifts.

Finally, the movie also tracks the emotional changes in the lead character (me) as his compassion and intellectual curiosity get distilled and submerged over time. The initial roles of research creator and objective observer are dominated by power and insensitivity to prisoners' suffering in the new role of Prison Superintendent.

Visit the official Stanford Prison Experiment website to learn more about the experiment.

Heroic Imagination

I should add that, along with continuing research in time perspectives and time perspective therapy , my new mission in life has been to empower everyone to wisely resist negative situational forces and evil by becoming Everyday Heroes in Training. Our non-profit Heroic Imagination Project (HIP) teaches ordinary people how to stand up, speak out and take effective actions in challenging situations in their lives.

Rosemary K.M. Sword and Philip Zimbardo are authors, along with Richard M. Sword, of The Time Cure: Overcoming PTSD with the New Psychology of Time Perspective Therapy.

• Find a Therapist
• Find a Treatment Center
• Find a Psychiatrist
• Find a Support Group
• Find Online Therapy
• United States
• Brooklyn, NY
• Chicago, IL
• Houston, TX
• Los Angeles, CA
• New York, NY
• Portland, OR
• San Diego, CA
• San Francisco, CA
• Seattle, WA
• Washington, DC
• Asperger's
• Bipolar Disorder
• Chronic Pain
• Eating Disorders
• Passive Aggression
• Personality
• Goal Setting
• Positive Psychology
• Stopping Smoking
• Low Sexual Desire
• Relationships
• Child Development
• Self Tests NEW
• Therapy Center
• Diagnosis Dictionary
• Types of Therapy

It’s increasingly common for someone to be diagnosed with a condition such as ADHD or autism as an adult. A diagnosis often brings relief, but it can also come with as many questions as answers.

• Emotional Intelligence
• Gaslighting
• Affective Forecasting
• Neuroscience

• ABBREVIATIONS
• BIOGRAPHIES
• CALCULATORS
• CONVERSIONS
• DEFINITIONS

The Stanford Prison Experiment

Daniel Culp: You have no right to f*** with my head!

Dr. Philip Zimbardo: This experiment... is over.

Peter Mitchell: Blow it out your ass, Mr. Correctional Officer!

Daniel Culp: Don't eat that sh*t.

Daniel Culp: I know you're a nice guy.

Christopher Archer: So why do you hate me?

Daniel Culp: Because I know what you can become.

Jesse Fletcher: You brought me here to legitimize this experiment, and there's nothing legitimate about this place, Phil.

Dr. Philip Zimbardo: You're right. You're right. I didn't explain it well. Prisons they represent a loss of freedom literally and symbolically.

Jesse Fletcher: Yeah, but that does not explain why they're wearing dresses. They're wearing dresses, Phil.

Dr. Philip Zimbardo: Yes, I understand. Uh, we're trying to strip away their individuality. Make them uniform. Feminize them.

Jesse Fletcher: Feminize them?

Dr. Philip Zimbardo: Yes. Feminize them. Take away all the things that make them them. You see we're trying to understand how an institution affects an individual's behavior. We're trying to do something... We're trying to do something good.

Karl Vandy: It's easy for you to say, 'Oh, I wouldn't have acted that way, but you don't know. That's - that's the truth. You don't know. And now, I know what I'm capable of, and it hurts.

Share your thoughts on The Stanford Prison Experiment's quotes with the community:

Report Comment

We're doing our best to make sure our content is useful, accurate and safe. If by any chance you spot an inappropriate comment while navigating through our website please use this form to let us know, and we'll take care of it shortly.

You need to be logged in to favorite .

Create a new account.

Your name: * Required

Your email address: * Required

Pick a user name: * Required

Username: * Required

Password: * Required

Forgot your password?    Retrieve it

Quote of the Day Today's Quote  |  Archive

Would you like us to send you a free inspiring quote delivered to your inbox daily.

Please enter your email address:

Use the citation below to add this movie page to your bibliography:

Style: MLA Chicago APA

"The Stanford Prison Experiment Quotes." Quotes.net. STANDS4 LLC, 2024. Web. 27 Sep. 2024. < https://www.quotes.net/movies/the_stanford_prison_experiment_quotes_149548 >.

Know another quote from The Stanford Prison Experiment?

Don't let people miss on a great quote from the "the stanford prison experiment" movie - add it here, the web's largest resource for, famous quotes & sayings, a member of the stands4 network, our favorite collection of, famous movies.

Browse Quotes.net

Are you a quotes master, "no soup for you".

• Bipolar Disorder
• Therapy Center
• When To See a Therapist
• Types of Therapy
• Best Online Therapy
• Best Couples Therapy
• Managing Stress
• Sleep and Dreaming
• Understanding Emotions
• Self-Improvement
• Healthy Relationships
• Student Resources
• Personality Types
• Guided Meditations
• Verywell Mind Insights
• 2024 Verywell Mind 25
• Mental Health in the Classroom
• Editorial Process
• Meet Our Review Board
• Crisis Support

The Stanford Prison Experiment

• Participants
• Setting and Procedure

In August of 1971, psychologist Philip Zimbardo and his colleagues created an experiment to determine the impacts of being a prisoner or prison guard. The Stanford Prison Experiment, also known as the Zimbardo Prison Experiment, went on to become one of the best-known studies in psychology's history —and one of the most controversial.

This study has long been a staple in textbooks, articles, psychology classes, and even movies. Learn what it entailed, what was learned, and the criticisms that have called the experiment's scientific merits and value into question.

Purpose of the Stanford Prison Experiment

Zimbardo was a former classmate of the psychologist Stanley Milgram . Milgram is best known for his famous obedience experiment , and Zimbardo was interested in expanding upon Milgram's research. He wanted to further investigate the impact of situational variables on human behavior.

Specifically, the researchers wanted to know how participants would react when placed in a simulated prison environment. They wondered if physically and psychologically healthy people who knew they were participating in an experiment would change their behavior in a prison-like setting.

Participants in the Stanford Prison Experiment

To carry out the experiment, researchers set up a mock prison in the basement of Stanford University's psychology building. They then selected 24 undergraduate students to play the roles of both prisoners and guards.

Participants were chosen from a larger group of 70 volunteers based on having no criminal background, no psychological issues , and no significant medical conditions. Each volunteer agreed to participate in the Stanford Prison Experiment for one to two weeks in exchange for $15 a day.

Setting and Procedures

The simulated prison included three six-by-nine-foot prison cells. Each cell held three prisoners and included three cots. Other rooms across from the cells were utilized for the jail guards and warden. One tiny space was designated as the solitary confinement room, and yet another small room served as the prison yard.

The 24 volunteers were randomly assigned to either the prisoner or guard group. Prisoners were to remain in the mock prison 24 hours a day during the study. Guards were assigned to work in three-man teams for eight-hour shifts. After each shift, they were allowed to return to their homes until their next shift.

Researchers were able to observe the behavior of the prisoners and guards using hidden cameras and microphones.

Results of the Stanford Prison Experiment

So what happened in the Zimbardo experiment? While originally slated to last 14 days, it had to be stopped after just six due to what was happening to the student participants. The guards became abusive and the prisoners began to show signs of extreme stress and anxiety .

It was noted that:

• While the prisoners and guards were allowed to interact in any way they wanted, the interactions were hostile or even dehumanizing.
• The guards began to become aggressive and abusive toward the prisoners while the prisoners became passive and depressed.
• Five of the prisoners began to experience severe negative emotions , including crying and acute anxiety, and had to be released from the study early.

Even the researchers themselves began to lose sight of the reality of the situation. Zimbardo, who acted as the prison warden, overlooked the abusive behavior of the jail guards until graduate student Christina Maslach voiced objections to the conditions in the simulated prison and the morality of continuing the experiment.

One possible explanation for the results of this experiment is the idea of deindividuation , which states that being part of a large group can make us more likely to perform behaviors we would otherwise not do on our own.

Impact of the Zimbardo Prison Experiment

The experiment became famous and was widely cited in textbooks and other publications. According to Zimbardo and his colleagues, the Stanford Prison Experiment demonstrated the powerful role that the situation can play in human behavior.

Because the guards were placed in a position of power, they began to behave in ways they would not usually act in their everyday lives or other situations. The prisoners, placed in a situation where they had no real control , became submissive and depressed.

In 2011, the Stanford Alumni Magazine featured a retrospective of the Stanford Prison Experiment in honor of the experiment’s 40th anniversary. The article contained interviews with several people involved, including Zimbardo and other researchers as well as some of the participants.

In the interviews, Richard Yacco, one of the prisoners in the experiment, suggested that the experiment demonstrated the power that societal roles and expectations can play in a person's behavior.

In 2015, the experiment became the topic of a feature film titled The Stanford Prison Experiment that dramatized the events of the 1971 study.

Criticisms of the Stanford Prison Experiment

In the years since the experiment was conducted, there have been a number of critiques of the study. Some of these include:

Ethical Issues

The Stanford Prison Experiment is frequently cited as an example of unethical research. It could not be replicated by researchers today because it fails to meet the standards established by numerous ethical codes, including the Code of Ethics of the American Psychological Association .

Why was Zimbardo's experiment unethical?

Zimbardo's experiment was unethical due to a lack of fully informed consent, abuse of participants, and lack of appropriate debriefings. More recent findings suggest there were other significant ethical issues that compromise the experiment's scientific standing, including the fact that experimenters may have encouraged abusive behaviors.

Lack of Generalizability

Other critics suggest that the study lacks generalizability due to a variety of factors. The unrepresentative sample of participants (mostly white and middle-class males) makes it difficult to apply the results to a wider population.

Lack of Realism

The Zimbardo Prison Experiment is also criticized for its lack of ecological validity. Ecological validity refers to the degree of realism with which a simulated experimental setup matches the real-world situation it seeks to emulate.

While the researchers did their best to recreate a prison setting, it is simply not possible to perfectly mimic all the environmental and situational variables of prison life. Because there may have been factors related to the setting and situation that influenced how the participants behaved, it may not truly represent what might happen outside of the lab.

Recent Criticisms

More recent examination of the experiment's archives and interviews with participants have revealed major issues with the research method , design, and procedures used. Together, these call the study's validity, value, and even authenticity into question.

These reports, including examinations of the study's records and new interviews with participants, have also cast doubt on some of its key findings and assumptions.

Among the issues described:

• One participant suggested that he faked a breakdown so he could leave the experiment because he was worried about failing his classes.
• Other participants also reported altering their behavior in a way designed to "help" the experiment .
• Evidence suggests that the experimenters encouraged the guards' behavior and played a role in fostering the abusive actions of the guards.

In 2019, the journal American Psychologist published an article debunking the famed experiment. It detailed the study's lack of scientific merit and concluded that the Stanford Prison Experiment was "an incredibly flawed study that should have died an early death."

In a statement posted on the experiment's official website, Zimbardo maintains that these criticisms do not undermine the main conclusion of the study—that situational forces can alter individual actions both in positive and negative ways.

The Stanford Prison Experiment is well known both inside and outside the field of psychology . While the study has long been criticized for many reasons, more recent criticisms of the study's procedures shine a brighter light on the experiment's scientific shortcomings.

Stanford University. About the Stanford Prison Experiment .

Stanford Prison Experiment. 2. Setting up .

Sommers T. An interview with Philip Zimbardo . The Believer.

Ratnesar R. The menace within . Stanford Magazine.

Jabbar A, Muazzam A, Sadaqat S. An unveiling the ethical quandaries: A critical analysis of the Stanford Prison Experiment as a mirror of Pakistani society . J Bus Manage Res . 2024;3(1):629-638.

Horn S. Landmark Stanford Prison Experiment criticized as a sham . Prison Legal News .

Bartels JM. The Stanford Prison Experiment in introductory psychology textbooks: A content analysis .  Psychol Learn Teach . 2015;14(1):36-50. doi:10.1177/1475725714568007

American Psychological Association. Ecological validity .

Blum B. The lifespan of a lie . Medium .

Le Texier T. Debunking the Stanford Prison Experiment . Am Psychol . 2019;74(7):823-839. doi:10.1037/amp0000401

Stanford Prison Experiment. Philip Zimbardo's response to recent criticisms of the Stanford Prison Experiment .

By Kendra Cherry, MSEd Kendra Cherry, MS, is a psychosocial rehabilitation specialist, psychology educator, and author of the "Everything Psychology Book."

Stanford Prison Experiment: Zimbardo’s Famous Study

Saul McLeod, PhD

Editor-in-Chief for Simply Psychology

BSc (Hons) Psychology, MRes, PhD, University of Manchester

Saul McLeod, PhD., is a qualified psychology teacher with over 18 years of experience in further and higher education. He has been published in peer-reviewed journals, including the Journal of Clinical Psychology.

Learn about our Editorial Process

Olivia Guy-Evans, MSc

Associate Editor for Simply Psychology

BSc (Hons) Psychology, MSc Psychology of Education

Olivia Guy-Evans is a writer and associate editor for Simply Psychology. She has previously worked in healthcare and educational sectors.

On This Page:

• The experiment was conducted in 1971 by psychologist Philip Zimbardo to examine situational forces versus dispositions in human behavior.
• 24 young, healthy, psychologically normal men were randomly assigned to be “prisoners” or “guards” in a simulated prison environment.
• The experiment had to be terminated after only 6 days due to the extreme, pathological behavior emerging in both groups. The situational forces overwhelmed the dispositions of the participants.
• Pacifist young men assigned as guards began behaving sadistically, inflicting humiliation and suffering on the prisoners. Prisoners became blindly obedient and allowed themselves to be dehumanized.
• The principal investigator, Zimbardo, was also transformed into a rigid authority figure as the Prison Superintendent.
• The experiment demonstrated the power of situations to alter human behavior dramatically. Even good, normal people can do evil things when situational forces push them in that direction.

Zimbardo and his colleagues (1973) were interested in finding out whether the brutality reported among guards in American prisons was due to the sadistic personalities of the guards (i.e., dispositional) or had more to do with the prison environment (i.e., situational).

For example, prisoners and guards may have personalities that make conflict inevitable, with prisoners lacking respect for law and order and guards being domineering and aggressive.

Alternatively, prisoners and guards may behave in a hostile manner due to the rigid power structure of the social environment in prisons.

Zimbardo predicted the situation made people act the way they do rather than their disposition (personality).

To study people’s roles in prison situations, Zimbardo converted a basement of the Stanford University psychology building into a mock prison.

He advertised asking for volunteers to participate in a study of the psychological effects of prison life.

The 75 applicants who answered the ad were given diagnostic interviews and personality tests to eliminate candidates with psychological problems, medical disabilities, or a history of crime or drug abuse.

24 men judged to be the most physically & mentally stable, the most mature, & the least involved in antisocial behaviors were chosen to participate.

The participants did not know each other prior to the study and were paid $15 per day to take part in the experiment.

Participants were randomly assigned to either the role of prisoner or guard in a simulated prison environment. There were two reserves, and one dropped out, finally leaving ten prisoners and 11 guards.

Prisoners were treated like every other criminal, being arrested at their own homes, without warning, and taken to the local police station. They were fingerprinted, photographed and ‘booked.’

Then they were blindfolded and driven to the psychology department of Stanford University, where Zimbardo had had the basement set out as a prison, with barred doors and windows, bare walls and small cells. Here the deindividuation process began.

When the prisoners arrived at the prison they were stripped naked, deloused, had all their personal possessions removed and locked away, and were given prison clothes and bedding. They were issued a uniform, and referred to by their number only.

The use of ID numbers was a way to make prisoners feel anonymous. Each prisoner had to be called only by his ID number and could only refer to himself and the other prisoners by number.

Their clothes comprised a smock with their number written on it, but no underclothes. They also had a tight nylon cap to cover their hair, and a locked chain around one ankle.

All guards were dressed in identical uniforms of khaki, and they carried a whistle around their neck and a billy club borrowed from the police. Guards also wore special sunglasses, to make eye contact with prisoners impossible.

Three guards worked shifts of eight hours each (the other guards remained on call). Guards were instructed to do whatever they thought was necessary to maintain law and order in the prison and to command the respect of the prisoners. No physical violence was permitted.

Zimbardo observed the behavior of the prisoners and guards (as a researcher), and also acted as a prison warden.

Within a very short time both guards and prisoners were settling into their new roles, with the guards adopting theirs quickly and easily.

Asserting Authority

Within hours of beginning the experiment, some guards began to harass prisoners. At 2:30 A.M. prisoners were awakened from sleep by blasting whistles for the first of many “counts.”

The counts served as a way to familiarize the prisoners with their numbers. More importantly, they provided a regular occasion for the guards to exercise control over the prisoners.

The prisoners soon adopted prisoner-like behavior too. They talked about prison issues a great deal of the time. They ‘told tales’ on each other to the guards.

They started taking the prison rules very seriously, as though they were there for the prisoners’ benefit and infringement would spell disaster for all of them. Some even began siding with the guards against prisoners who did not obey the rules.

Physical Punishment

The prisoners were taunted with insults and petty orders, they were given pointless and boring tasks to accomplish, and they were generally dehumanized.

Push-ups were a common form of physical punishment imposed by the guards. One of the guards stepped on the prisoners” backs while they did push-ups, or made other prisoners sit on the backs of fellow prisoners doing their push-ups.

Asserting Independence

Because the first day passed without incident, the guards were surprised and totally unprepared for the rebellion which broke out on the morning of the second day.

During the second day of the experiment, the prisoners removed their stocking caps, ripped off their numbers, and barricaded themselves inside the cells by putting their beds against the door.

The guards called in reinforcements. The three guards who were waiting on stand-by duty came in and the night shift guards voluntarily remained on duty.

Putting Down the Rebellion

The guards retaliated by using a fire extinguisher which shot a stream of skin-chilling carbon dioxide, and they forced the prisoners away from the doors. Next, the guards broke into each cell, stripped the prisoners naked and took the beds out.

The ringleaders of the prisoner rebellion were placed into solitary confinement. After this, the guards generally began to harass and intimidate the prisoners.

Special Privileges

One of the three cells was designated as a “privilege cell.” The three prisoners least involved in the rebellion were given special privileges. The guards gave them back their uniforms and beds and allowed them to wash their hair and brush their teeth.

Privileged prisoners also got to eat special food in the presence of the other prisoners who had temporarily lost the privilege of eating. The effect was to break the solidarity among prisoners.

Consequences of the Rebellion

Over the next few days, the relationships between the guards and the prisoners changed, with a change in one leading to a change in the other. Remember that the guards were firmly in control and the prisoners were totally dependent on them.

As the prisoners became more dependent, the guards became more derisive towards them. They held the prisoners in contempt and let the prisoners know it. As the guards’ contempt for them grew, the prisoners became more submissive.

As the prisoners became more submissive, the guards became more aggressive and assertive. They demanded ever greater obedience from the prisoners. The prisoners were dependent on the guards for everything, so tried to find ways to please the guards, such as telling tales on fellow prisoners.

Prisoner #8612

Less than 36 hours into the experiment, Prisoner #8612 began suffering from acute emotional disturbance, disorganized thinking, uncontrollable crying, and rage.

After a meeting with the guards where they told him he was weak, but offered him “informant” status, #8612 returned to the other prisoners and said “You can”t leave. You can’t quit.”

Soon #8612 “began to act ‘crazy,’ to scream, to curse, to go into a rage that seemed out of control.” It wasn’t until this point that the psychologists realized they had to let him out.

A Visit from Parents

The next day, the guards held a visiting hour for parents and friends. They were worried that when the parents saw the state of the jail, they might insist on taking their sons home. Guards washed the prisoners, had them clean and polish their cells, fed them a big dinner and played music on the intercom.

After the visit, rumors spread of a mass escape plan. Afraid that they would lose the prisoners, the guards and experimenters tried to enlist help and facilities of the Palo Alto police department.

The guards again escalated the level of harassment, forcing them to do menial, repetitive work such as cleaning toilets with their bare hands.

Catholic Priest

Zimbardo invited a Catholic priest who had been a prison chaplain to evaluate how realistic our prison situation was. Half of the prisoners introduced themselves by their number rather than name.

The chaplain interviewed each prisoner individually. The priest told them the only way they would get out was with the help of a lawyer.

Prisoner #819

Eventually, while talking to the priest, #819 broke down and began to cry hysterically, just like two previously released prisoners had.

The psychologists removed the chain from his foot, the cap off his head, and told him to go and rest in a room that was adjacent to the prison yard. They told him they would get him some food and then take him to see a doctor.

While this was going on, one of the guards lined up the other prisoners and had them chant aloud:

“Prisoner #819 is a bad prisoner. Because of what Prisoner #819 did, my cell is a mess, Mr. Correctional Officer.”

The psychologists realized #819 could hear the chanting and went back into the room where they found him sobbing uncontrollably. The psychologists tried to get him to agree to leave the experiment, but he said he could not leave because the others had labeled him a bad prisoner.

Back to Reality

At that point, Zimbardo said, “Listen, you are not #819. You are [his name], and my name is Dr. Zimbardo. I am a psychologist, not a prison superintendent, and this is not a real prison. This is just an experiment, and those are students, not prisoners, just like you. Let’s go.”

He stopped crying suddenly, looked up and replied, “Okay, let’s go,“ as if nothing had been wrong.

An End to the Experiment

Zimbardo (1973) had intended that the experiment should run for two weeks, but on the sixth day, it was terminated, due to the emotional breakdowns of prisoners, and excessive aggression of the guards.

Christina Maslach, a recent Stanford Ph.D. brought in to conduct interviews with the guards and prisoners, strongly objected when she saw the prisoners being abused by the guards.

Filled with outrage, she said, “It’s terrible what you are doing to these boys!” Out of 50 or more outsiders who had seen our prison, she was the only one who ever questioned its morality.

Zimbardo (2008) later noted, “It wasn’t until much later that I realized how far into my prison role I was at that point — that I was thinking like a prison superintendent rather than a research psychologist.“

This led him to prioritize maintaining the experiment’s structure over the well-being and ethics involved, thereby highlighting the blurring of roles and the profound impact of the situation on human behavior.

Here’s a quote that illustrates how Philip Zimbardo, initially the principal investigator, became deeply immersed in his role as the “Stanford Prison Superintendent (April 19, 2011):

“By the third day, when the second prisoner broke down, I had already slipped into or been transformed into the role of “Stanford Prison Superintendent.” And in that role, I was no longer the principal investigator, worried about ethics. When a prisoner broke down, what was my job? It was to replace him with somebody on our standby list. And that’s what I did. There was a weakness in the study in not separating those two roles. I should only have been the principal investigator, in charge of two graduate students and one undergraduate.”

According to Zimbardo and his colleagues, the Stanford Prison Experiment revealed how people will readily conform to the social roles they are expected to play, especially if the roles are as strongly stereotyped as those of the prison guards.

Because the guards were placed in a position of authority, they began to act in ways they would not usually behave in their normal lives.

The “prison” environment was an important factor in creating the guards’ brutal behavior (none of the participants who acted as guards showed sadistic tendencies before the study).

Therefore, the findings support the situational explanation of behavior rather than the dispositional one.

Zimbardo proposed that two processes can explain the prisoner’s “final submission.”

Deindividuation may explain the behavior of the participants; especially the guards. This is a state when you become so immersed in the norms of the group that you lose your sense of identity and personal responsibility.

The guards may have been so sadistic because they did not feel what happened was down to them personally – it was a group norm. They also may have lost their sense of personal identity because of the uniform they wore.

Also, learned helplessness could explain the prisoner’s submission to the guards. The prisoners learned that whatever they did had little effect on what happened to them. In the mock prison the unpredictable decisions of the guards led the prisoners to give up responding.

After the prison experiment was terminated, Zimbardo interviewed the participants. Here’s an excerpt:

‘Most of the participants said they had felt involved and committed. The research had felt “real” to them. One guard said, “I was surprised at myself. I made them call each other names and clean the toilets out with their bare hands. I practically considered the prisoners cattle and I kept thinking I had to watch out for them in case they tried something.” Another guard said “Acting authoritatively can be fun. Power can be a great pleasure.” And another: “… during the inspection I went to Cell Two to mess up a bed which a prisoner had just made and he grabbed me, screaming that he had just made it and that he was not going to let me mess it up. He grabbed me by the throat and although he was laughing I was pretty scared. I lashed out with my stick and hit him on the chin although not very hard, and when I freed myself I became angry.”’

Most of the guards found it difficult to believe that they had behaved in the brutal ways that they had. Many said they hadn’t known this side of them existed or that they were capable of such things.

The prisoners, too, couldn’t believe that they had responded in the submissive, cowering, dependent way they had. Several claimed to be assertive types normally.

When asked about the guards, they described the usual three stereotypes that can be found in any prison: some guards were good, some were tough but fair, and some were cruel.

A further explanation for the behavior of the participants can be described in terms of reinforcement.  The escalation of aggression and abuse by the guards could be seen as being due to the positive reinforcement they received both from fellow guards and intrinsically in terms of how good it made them feel to have so much power.

Similarly, the prisoners could have learned through negative reinforcement that if they kept their heads down and did as they were told, they could avoid further unpleasant experiences.

Critical Evaluation

Ecological validity.

The Stanford Prison Experiment is criticized for lacking ecological validity in its attempt to simulate a real prison environment. Specifically, the “prison” was merely a setup in the basement of Stanford University’s psychology department.

The student “guards” lacked professional training, and the experiment’s duration was much shorter than real prison sentences. Furthermore, the participants, who were college students, didn’t reflect the diverse backgrounds typically found in actual prisons in terms of ethnicity, education, and socioeconomic status.

None had prior prison experience, and they were chosen due to their mental stability and low antisocial tendencies. Additionally, the mock prison lacked spaces for exercise or rehabilitative activities.

Demand characteristics

Demand characteristics could explain the findings of the study. Most of the guards later claimed they were simply acting. Because the guards and prisoners were playing a role, their behavior may not be influenced by the same factors which affect behavior in real life. This means the study’s findings cannot be reasonably generalized to real life, such as prison settings. I.e, the study has low ecological validity.

One of the biggest criticisms is that strong demand characteristics confounded the study. Banuazizi and Movahedi (1975) found that the majority of respondents, when given a description of the study, were able to guess the hypothesis and predict how participants were expected to behave.

This suggests participants may have simply been playing out expected roles rather than genuinely conforming to their assigned identities.

In addition, revelations by Zimbardo (2007) indicate he actively encouraged the guards to be cruel and oppressive in his orientation instructions prior to the start of the study. For example, telling them “they [the prisoners] will be able to do nothing and say nothing that we don’t permit.”

He also tacitly approved of abusive behaviors as the study progressed. This deliberate cueing of how participants should act, rather than allowing behavior to unfold naturally, indicates the study findings were likely a result of strong demand characteristics rather than insightful revelations about human behavior.

However, there is considerable evidence that the participants did react to the situation as though it was real. For example, 90% of the prisoners’ private conversations, which were monitored by the researchers, were on the prison conditions, and only 10% of the time were their conversations about life outside of the prison.

The guards, too, rarely exchanged personal information during their relaxation breaks – they either talked about ‘problem prisoners,’ other prison topics, or did not talk at all. The guards were always on time and even worked overtime for no extra pay.

When the prisoners were introduced to a priest, they referred to themselves by their prison number, rather than their first name. Some even asked him to get a lawyer to help get them out.

Fourteen years after his experience as prisoner 8612 in the Stanford Prison Experiment, Douglas Korpi, now a prison psychologist, reflected on his time and stated (Musen and Zimbardo 1992):

“The Stanford Prison Experiment was a very benign prison situation and it promotes everything a normal prison promotes — the guard role promotes sadism, the prisoner role promotes confusion and shame”.

Sample bias

The study may also lack population validity as the sample comprised US male students. The study’s findings cannot be applied to female prisons or those from other countries. For example, America is an individualist culture (where people are generally less conforming), and the results may be different in collectivist cultures (such as Asian countries).

Carnahan and McFarland (2007) have questioned whether self-selection may have influenced the results – i.e., did certain personality traits or dispositions lead some individuals to volunteer for a study of “prison life” in the first place?

All participants completed personality measures assessing: aggression, authoritarianism, Machiavellianism, narcissism, social dominance, empathy, and altruism. Participants also answered questions on mental health and criminal history to screen out any issues as per the original SPE.

Results showed that volunteers for the prison study, compared to the control group, scored significantly higher on aggressiveness, authoritarianism, Machiavellianism, narcissism, and social dominance. They scored significantly lower on empathy and altruism.

A follow-up role-playing study found that self-presentation biases could not explain these differences. Overall, the findings suggest that volunteering for the prison study was influenced by personality traits associated with abusive tendencies.

Zimbardo’s conclusion may be wrong

While implications for the original SPE are speculative, this lends support to a person-situation interactionist perspective, rather than a purely situational account.

It implies that certain individuals are drawn to and selected into situations that fit their personality, and that group composition can shape behavior through mutual reinforcement.

Contributions to psychology

Another strength of the study is that the harmful treatment of participants led to the formal recognition of ethical  guidelines by the American Psychological Association. Studies must now undergo an extensive review by an institutional review board (US) or ethics committee (UK) before they are implemented.

Most institutions, such as universities, hospitals, and government agencies, require a review of research plans by a panel. These boards review whether the potential benefits of the research are justifiable in light of the possible risk of physical or psychological harm.

These boards may request researchers make changes to the study’s design or procedure, or, in extreme cases, deny approval of the study altogether.

Contribution to prison policy

A strength of the study is that it has altered the way US prisons are run. For example, juveniles accused of federal crimes are no longer housed before trial with adult prisoners (due to the risk of violence against them).

However, in the 25 years since the SPE, U.S. prison policy has transformed in ways counter to SPE insights (Haney & Zimbardo, 1995):

• Rehabilitation was abandoned in favor of punishment and containment. Prison is now seen as inflicting pain rather than enabling productive re-entry.
• Sentencing became rigid rather than accounting for inmates’ individual contexts. Mandatory minimums and “three strikes” laws over-incarcerate nonviolent crimes.
• Prison construction boomed, and populations soared, disproportionately affecting minorities. From 1925 to 1975, incarceration rates held steady at around 100 per 100,000. By 1995, rates tripled to over 600 per 100,000.
• Drug offenses account for an increasing proportion of prisoners. Nonviolent drug offenses make up a large share of the increased incarceration.
• Psychological perspectives have been ignored in policymaking. Legislators overlooked insights from social psychology on the power of contexts in shaping behavior.
• Oversight retreated, with courts deferring to prison officials and ending meaningful scrutiny of conditions. Standards like “evolving decency” gave way to “legitimate” pain.
• Supermax prisons proliferated, isolating prisoners in psychological trauma-inducing conditions.

The authors argue psychologists should reengage to:

• Limit the use of imprisonment and adopt humane alternatives based on the harmful effects of prison environments
• Assess prisons’ total environments, not just individual conditions, given situational forces interact
• Prepare inmates for release by transforming criminogenic post-release contexts
• Address socioeconomic risk factors, not just incarcerate individuals
• Develop contextual prediction models vs. focusing only on static traits
• Scrutinize prison systems independently, not just defer to officials shaped by those environments
• Generate creative, evidence-based reforms to counter over-punitive policies

Psychology once contributed to a more humane system and can again counter the U.S. “rage to punish” with contextual insights (Haney & Zimbardo, 1998).

Evidence for situational factors

Zimbardo (1995) further demonstrates the power of situations to elicit evil actions from ordinary, educated people who likely would never have done such things otherwise. It was another situation-induced “transformation of human character.”

• Unit 731 was a covert biological and chemical warfare research unit of the Japanese army during WWII.
• It was led by General Shiro Ishii and involved thousands of doctors and researchers.
• Unit 731 set up facilities near Harbin, China to conduct lethal human experimentation on prisoners, including Allied POWs.
• Experiments involved exposing prisoners to things like plague, anthrax, mustard gas, and bullets to test biological weapons. They infected prisoners with diseases and monitored their deaths.
• At least 3,000 prisoners died from these brutal experiments. Many were killed and dissected.
• The doctors in Unit 731 obeyed orders unquestioningly and conducted these experiments in the name of “medical science.”
• After the war, the vast majority of doctors who participated faced no punishment and went on to have prestigious careers. This was largely covered up by the U.S. in exchange for data.
• It shows how normal, intelligent professionals can be led by situational forces to systematically dehumanize victims and conduct incredibly cruel and lethal experiments on people.
• Even healers trained to preserve life used their expertise to destroy lives when the situational forces compelled obedience, nationalism, and wartime enmity.

Evidence for an interactionist approach

The results are also relevant for explaining abuses by American guards at Abu Ghraib prison in Iraq.

An interactionist perspective recognizes that volunteering for roles as prison guards attracts those already prone to abusive tendencies, which are intensified by the prison context.

This counters a solely situationist view of good people succumbing to evil situational forces.

Ethical Issues

The study has received many ethical criticisms, including lack of fully informed consent by participants as Zimbardo himself did not know what would happen in the experiment (it was unpredictable). Also, the prisoners did not consent to being “arrested” at home. The prisoners were not told partly because final approval from the police wasn’t given until minutes before the participants decided to participate, and partly because the researchers wanted the arrests to come as a surprise. However, this was a breach of the ethics of Zimbardo’s own contract that all of the participants had signed.

Protection of Participants

Participants playing the role of prisoners were not protected from psychological harm, experiencing incidents of humiliation and distress. For example, one prisoner had to be released after 36 hours because of uncontrollable bursts of screaming, crying, and anger.

Here’s a quote from Philip G. Zimbardo, taken from an interview on the Stanford Prison Experiment’s 40th anniversary (April 19, 2011):

“In the Stanford prison study, people were stressed, day and night, for 5 days, 24 hours a day. There’s no question that it was a high level of stress because five of the boys had emotional breakdowns, the first within 36 hours. Other boys that didn’t have emotional breakdowns were blindly obedient to corrupt authority by the guards and did terrible things to each other. And so it is no question that that was unethical. You can’t do research where you allow people to suffer at that level.”

“After the first one broke down, we didn’t believe it. We thought he was faking. There was actually a rumor he was faking to get out. He was going to bring his friends in to liberate the prison. And/or we believed our screening procedure was inadequate, [we believed] that he had some mental defect that we did not pick up. At that point, by the third day, when the second prisoner broke down, I had already slipped into or been transformed into the role of “Stanford Prison Superintendent.” And in that role, I was no longer the principal investigator, worried about ethics.”

However, in Zimbardo’s defense, the emotional distress experienced by the prisoners could not have been predicted from the outset.

Approval for the study was given by the Office of Naval Research, the Psychology Department, and the University Committee of Human Experimentation.

This Committee also did not anticipate the prisoners’ extreme reactions that were to follow. Alternative methodologies were looked at that would cause less distress to the participants but at the same time give the desired information, but nothing suitable could be found.

Withdrawal 

Although guards were explicitly instructed not to physically harm prisoners at the beginning of the Stanford Prison Experiment, they were allowed to induce feelings of boredom, frustration, arbitrariness, and powerlessness among the inmates.

This created a pervasive atmosphere where prisoners genuinely believed and even reinforced among each other, that they couldn’t leave the experiment until their “sentence” was completed, mirroring the inescapability of a real prison.

Even though two participants (8612 and 819) were released early, the impact of the environment was so profound that prisoner 416, reflecting on the experience two months later, described it as a “prison run by psychologists rather than by the state.”

Extensive group and individual debriefing sessions were held, and all participants returned post-experimental questionnaires several weeks, then several months later, and then at yearly intervals. Zimbardo concluded there were no lasting negative effects.

Zimbardo also strongly argues that the benefits gained from our understanding of human behavior and how we can improve society should outbalance the distress caused by the study.

However, it has been suggested that the US Navy was not so much interested in making prisons more human and were, in fact, more interested in using the study to train people in the armed services to cope with the stresses of captivity.

Discussion Questions

What are the effects of living in an environment with no clocks, no view of the outside world, and minimal sensory stimulation?

Consider the psychological consequences of stripping, delousing, and shaving the heads of prisoners or members of the military. Whattransformations take place when people go through an experience like this?

The prisoners could have left at any time, and yet, they didn’t. Why?

After the study, how do you think the prisoners and guards felt?

If you were the experimenter in charge, would you have done this study? Would you have terminated it earlier? Would you have conducted a follow-up study?

Frequently Asked Questions

What happened to prisoner 8612 after the experiment.

Douglas Korpi, as prisoner 8612, was the first to show signs of severe distress and demanded to be released from the experiment. He was released on the second day, and his reaction to the simulated prison environment highlighted the study’s ethical issues and the potential harm inflicted on participants.

After the experiment, Douglas Korpi graduated from Stanford University and earned a Ph.D. in clinical psychology. He pursued a career as a psychotherapist, helping others with their mental health struggles.

Why did Zimbardo not stop the experiment?

Zimbardo did not initially stop the experiment because he became too immersed in his dual role as the principal investigator and the prison superintendent, causing him to overlook the escalating abuse and distress among participants.

It was only after an external observer, Christina Maslach, raised concerns about the participants’ well-being that Zimbardo terminated the study.

What happened to the guards in the Stanford Prison Experiment?

In the Stanford Prison Experiment, the guards exhibited abusive and authoritarian behavior, using psychological manipulation, humiliation, and control tactics to assert dominance over the prisoners. This ultimately led to the study’s early termination due to ethical concerns.

What did Zimbardo want to find out?

Zimbardo aimed to investigate the impact of situational factors and power dynamics on human behavior, specifically how individuals would conform to the roles of prisoners and guards in a simulated prison environment.

He wanted to explore whether the behavior displayed in prisons was due to the inherent personalities of prisoners and guards or the result of the social structure and environment of the prison itself.

What were the results of the Stanford Prison Experiment?

The results of the Stanford Prison Experiment showed that situational factors and power dynamics played a significant role in shaping participants’ behavior. The guards became abusive and authoritarian, while the prisoners became submissive and emotionally distressed.

The experiment revealed how quickly ordinary individuals could adopt and internalize harmful behaviors due to their assigned roles and the environment.

Banuazizi, A., & Movahedi, S. (1975). Interpersonal dynamics in a simulated prison: A methodological analysis. American Psychologist, 30 , 152-160.

Carnahan, T., & McFarland, S. (2007). Revisiting the Stanford prison experiment: Could participant self-selection have led to the cruelty? Personality and Social Psychology Bulletin, 33, 603-614.

Drury, S., Hutchens, S. A., Shuttlesworth, D. E., & White, C. L. (2012). Philip G. Zimbardo on his career and the Stanford Prison Experiment’s 40th anniversary.  History of Psychology ,  15 (2), 161.

Griggs, R. A., & Whitehead, G. I., III. (2014). Coverage of the Stanford Prison Experiment in introductory social psychology textbooks. Teaching of Psychology, 41 , 318 –324.

Haney, C., Banks, W. C., & Zimbardo, P. G. (1973). A study of prisoners and guards in a simulated prison . Naval Research Review , 30, 4-17.

Haney, C., & Zimbardo, P. (1998). The past and future of U.S. prison policy: Twenty-five years after the Stanford Prison Experiment.  American Psychologist, 53 (7), 709–727.

Musen, K. & Zimbardo, P. (1992) (DVD) Quiet Rage: The Stanford Prison Experiment Documentary.

Zimbardo, P. G. (Consultant, On-Screen Performer), Goldstein, L. (Producer), & Utley, G. (Correspondent). (1971, November 26). Prisoner 819 did a bad thing: The Stanford Prison Experiment [Television series episode]. In L. Goldstein (Producer), Chronolog. New York, NY: NBC-TV.

Zimbardo, P. G. (1973). On the ethics of intervention in human psychological research: With special reference to the Stanford prison experiment.  Cognition ,  2 (2), 243-256.

Zimbardo, P. G. (1995). The psychology of evil: A situationist perspective on recruiting good people to engage in anti-social acts.  Japanese Journal of Social Psychology ,  11 (2), 125-133.

Zimbardo, P.G. (2007). The Lucifer effect: Understanding how good people turn evil . New York, NY: Random House.

Further Information

• Reicher, S., & Haslam, S. A. (2006). Rethinking the psychology of tyranny: The BBC prison study. The British Journal of Social Psychology, 45 , 1.
• Coverage of the Stanford Prison Experiment in introductory psychology textbooks
• The Stanford Prison Experiment Official Website

Log in or sign up for Rotten Tomatoes

Trouble logging in?

By continuing, you agree to the Privacy Policy and the Terms and Policies , and to receive email from the Fandango Media Brands .

By creating an account, you agree to the Privacy Policy and the Terms and Policies , and to receive email from Rotten Tomatoes and to receive email from the Fandango Media Brands .

By creating an account, you agree to the Privacy Policy and the Terms and Policies , and to receive email from Rotten Tomatoes.

Email not verified

Let's keep in touch.

Sign up for the Rotten Tomatoes newsletter to get weekly updates on:

• Upcoming Movies and TV shows
• Rotten Tomatoes Podcast
• Media News + More

By clicking "Sign Me Up," you are agreeing to receive occasional emails and communications from Fandango Media (Fandango, Vudu, and Rotten Tomatoes) and consenting to Fandango's Privacy Policy and Terms and Policies . Please allow 10 business days for your account to reflect your preferences.

OK, got it!

• About Rotten Tomatoes®
• Login/signup

Movies in theaters

• Opening This Week
• Top Box Office
• Coming Soon to Theaters
• Certified Fresh Movies

Movies at Home

• Fandango at Home
• Prime Video
• Most Popular Streaming Movies
• What to Watch New

Certified fresh picks

• 98% The Wild Robot Link to The Wild Robot
• 100% Girls Will Be Girls Link to Girls Will Be Girls
• 100% Super/Man: The Christopher Reeve Story Link to Super/Man: The Christopher Reeve Story

New TV Tonight

• 100% Colin from Accounts: Season 2
• 100% Matlock: Season 1
• 100% Brilliant Minds: Season 1
• 71% Murder in a Small Town: Season 1
• 50% Rescue: HI-Surf: Season 1
• -- Grotesquerie: Season 1
• 95% Nobody Wants This: Season 1
• -- Everybody Still Hates Chris: Season 1
• -- Doctor Odyssey: Season 1
• -- Social Studies: Season 1

Most Popular TV on RT

• 94% The Penguin: Season 1
• 83% Agatha All Along: Season 1
• 65% The Perfect Couple: Season 1
• 67% Mr. McMahon: Season 1
• 86% High Potential: Season 1
• 50% Monsters: The Lyle and Erik Menendez Story: Season 2
• 100% Slow Horses: Season 4
• 100% From: Season 3
• Best TV Shows
• Most Popular TV

Certified fresh pick

• 83% Agatha All Along: Season 1 Link to Agatha All Along: Season 1
• All-Time Lists
• Binge Guide
• Comics on TV
• Five Favorite Films
• Video Interviews
• Weekend Box Office
• Weekly Ketchup
• What to Watch

All Saturday Night Live Movies Ranked

The 100 Best Horror Movies of the 1970s

What to Watch: In Theaters and On Streaming

Awards Tour

Vote in the 1994 Movies Showdown – Round 2

10 Latin Directors to Seek Out and Their Freshest and Hottest Hits

• Trending on RT
• Hispanic Heritage Month
• All SNL Movies Ranked
• Movie Re-Release Calendar
• Most Anticipated TV

The Stanford Prison Experiment

Where to watch.

Watch The Stanford Prison Experiment with a subscription on Paramount+, rent on Prime Video, Apple TV, or buy on Prime Video, Apple TV.

What to Know

As chillingly thought-provoking as it is absorbing and well-acted, The Stanford Prison Experiment offers historical drama that packs a timelessly relevant punch.

Critics Reviews

Audience reviews, cast & crew.

Kyle Patrick Alvarez

Billy Crudup

Dr. Philip Zimbardo

Michael Angarano

Christopher Archer

Moises Arias

Anthony Carroll

Nicholas Braun

Gaius Charles

More Like This

Related movie news.

• History & Society
• Science & Tech
• Biographies
• Animals & Nature
• Geography & Travel
• Arts & Culture
• Games & Quizzes
• On This Day
• One Good Fact
• New Articles
• Lifestyles & Social Issues
• Philosophy & Religion
• Politics, Law & Government
• World History
• Health & Medicine
• Browse Biographies
• Birds, Reptiles & Other Vertebrates
• Bugs, Mollusks & Other Invertebrates
• Environment
• Fossils & Geologic Time
• Entertainment & Pop Culture
• Sports & Recreation
• Visual Arts
• Demystified
• Image Galleries
• Infographics
• Top Questions
• Britannica Kids
• Saving Earth
• Space Next 50
• Student Center

Stanford Prison Experiment

Our editors will review what you’ve submitted and determine whether to revise the article.

• BBC News - Stanford prison experiment continues to shock
• Official Site of Stanford Prison Experiment
• Grand Valley State University - Twenty-Five Years after the Stanford Prison Experiment
• American Psychological Association - Demonstrating the Power of Social Situations via a Simulated Prison Experiment
• Verywell Mind - The Stanford Prison Experiment
• Stanford Libraries - Stanford Prison Experiment
• Simply Psychology - Stanford Prison Experiment: Zimbardo’s Famous Study
• Academia - Stanford Prison Experiment

Stanford Prison Experiment , a social psychology study in which college students became prisoners or guards in a simulated prison environment . The experiment, funded by the U.S. Office of Naval Research, took place at Stanford University in August 1971. It was intended to measure the effect of role-playing, labeling, and social expectations on behaviour over a period of two weeks. However, mistreatment of prisoners escalated so alarmingly that principal investigator Philip G. Zimbardo terminated the experiment after only six days.

More than 70 young men responded to an advertisement about a “psychological study of prison life,” and experimenters selected 24 applicants who were judged to be physically and mentally healthy. The paid subjects—they received $15 a day—were divided randomly into equal numbers of guards and prisoners. Guards were ordered not to physically abuse prisoners and were issued mirrored sunglasses that prevented any eye contact. Prisoners were “arrested” by actual police and handed over to the experimenters in a mock prison in the basement of a campus building. Prisoners were then subjected to indignities that were intended to simulate the environment of a real-life prison. In keeping with Zimbardo’s intention to create very quickly an “atmosphere of oppression,” each prisoner was made to wear a “dress” as a uniform and to carry a chain padlocked around one ankle. All participants were observed and videotaped by the experimenters.

On only the second day the prisoners staged a rebellion. Guards then worked out a system of rewards and punishments to manage the prisoners. Within the first four days, three prisoners had become so traumatized that they were released. Over the course of the experiment, some of the guards became cruel and tyrannical, while a number of the prisoners became depressed and disoriented. However, only after an outside observer came upon the scene and registered shock did Zimbardo conclude the experiment, less than a week after it had started.

The Stanford Prison Experiment immediately came under attack on methodological and ethical grounds. Zimbardo admitted that during the experiment he had sometimes felt more like a prison superintendent than a research psychologist. Later on, he claimed that the experiment’s “social forces and environmental contingencies” had led the guards to behave badly. However, others claimed that the original advertisement attracted people who were predisposed to authoritarianism . The most conspicuous challenge to the Stanford findings came decades later in the form of the BBC Prison Study, a differently organized experiment documented in a British Broadcasting Corporation series called The Experiment (2002). The BBC’s mock prisoners turned out to be more assertive than Zimbardo’s. The British experimenters called the Stanford experiment “a study of what happens when a powerful authority figure (Zimbardo) imposes tyranny.”

The Stanford Prison Experiment became widely known outside academia . It was the acknowledged inspiration for Das Experiment (2001), a German movie that was remade in the United States as the direct-to-video film The Experiment (2010). The Stanford Prison Experiment (2015) was created with Zimbardo’s active participation; the dramatic film more closely followed actual events.

• Cast & crew
• User reviews

The Stanford Prison Experiment

• Dr. Philip Zimbardo : This experiment... is over.
• Daniel Culp : I know you're a nice guy.
• Christopher Archer : So why do you hate me?
• Daniel Culp : Because I know what you can become.
• Karl Vandy : It's easy for you to say, 'Oh, I wouldn't have acted that way', but you don't know. That's - that's the truth. You don't know. And now I know what I'm capable of, and it hurts.
• Daniel Culp : You have no right to fuck with my head!
• Jesse Fletcher : You brought me here to legitimize this experiment and there's nothing legitimate about this place, Phil.
• Dr. Philip Zimbardo : You're right. You're right. I didn't explain it well. Prisons, they represent a loss of freedom, literally and symbolically.
• Jesse Fletcher : Yeah, but that does not explain why they're wearing dresses. They're wearing dresses, Phil.
• Dr. Philip Zimbardo : Yes, I understand. Uh, we're trying to strip away their individuality. Make them uniform. Feminize them.
• Jesse Fletcher : Feminize them?
• Dr. Philip Zimbardo : Yes. Feminize them. Take away all the things that make them them. You see, we're trying to understand how an institution affects an individual's behavior. We're trying to do something... We're trying to do something good.
• Peter Mitchell : Blow it out your ass, Mr. Correctional Officer!
• Daniel Culp : Don't eat that shit.

Contribute to this page

• See more gaps
• Learn more about contributing

More from this title

More to explore, recently viewed.