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The Stanford Prison Experiment

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The Stanford Prison Experiment es una película del 2015 basada en el libro "The Lucifer Effect", dirigida por Kyle Patrick Alvarez y escrita por Tim Talbott y Philip Zimbardo . La película está protagonizada por Billy Crudup , Michael Angarano y Moises Arias .

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Personaje Actor original Actor de doblaje
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Dr. Philip Zimbardo
Christopher Archer
Daniel Culp / 8612
Peter Mitchell / 819
Dra. Christina Maslach
Jeff Jansen / 1037
Paul Vogel
Mike Penny
Tom Thompson / 2093 Chris Sheffield
Jacob Harding
Hubbie Whitlow / 7258 Brett Davern
Karl Vandy
Gavin Lee / 3401
Matthew Townshend James Frecheville
Jesse Fletcher
Paul Beattie / 5704 Jesse Carere
Jim Randall / 4325 Jack Kilmer
Kyle Parker
Prisionero 416
Jerry Sherman / 5486
Anthony Carroll
Marshall Lovett
John Lovett
Padre MacAllister Albert Malafronte
Sra. Mitchell Kate Butler
Andrew Ceros
Mary Ann Danielle Lauder
Henry Ward
Warren Jim Klock
Jim Cook Fred Ochs
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The Stanford Prison Experiment

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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."

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What the Stanford Prison Experiment Taught Us

Guards with a blindfolded prisoner, still from the Stanford Prison Experiment conducted by Phillip Zimbardo

In August of 1971, Dr. Philip G. Zimbardo of Stanford University in California conducted what is widely considered one of the most influential experiments in social psychology to date. Made into a New York Times best seller in 2007 ( The Lucifer Effect ) and a major motion picture in 2015 ( The Stanford Prison Experiment ), the Stanford Prison Experiment has integrated itself not only into the psychology community but also popular culture. The events that occurred within this experiment, though disturbing, have given many people insight into just how much a situation can affect behavior. They have also caused many to ponder the nature of evil. How disturbing was it? Well, the proposed two-week experiment was terminated after just six days, due to alarming levels of mistreatment and brutality perpetrated on student “prisoners” by fellow student “guards.”

The study aimed to test the effects of prison life on behavior and wanted to tackle the effects of situational behavior rather than just those of disposition. After placing an ad in the newspaper, Zimbardo selected 24 mentally and physically healthy undergraduate students to participate in the study. The idea was to randomly assign nine boys to be prisoners, nine to be guards, and six to be extras should they need to make any replacements. After randomly assigning the boys, the nine deemed prisoners were “arrested” and promptly brought into a makeshift Stanford County Prison, which was really just the basement of the Stanford Psychology Department building. Upon arrival, the boys’ heads were shaved, and they were subjected to a strip search as well as delousing (measures taken to dehumanize the prisoners). Each prisoner was then issued a uniform and a number to increase anonymity. The guards who were to be in charge of the prisoners were not given any formal training; they were to make up their own set of rules as to how they would govern their prison.

Over the course of six days, a shocking set of events unfolded. While day one seemed to go by without issue, on the second day there was a rebellion, causing guards to spray prisoners with a fire extinguisher in order to force them further into their cells. The guards took the prisoners’ beds and even utilized solitary confinement. They also began to use psychological tactics, attempting to break prisoner solidarity by creating a privilege cell. With each member of the experiment, including Zimbardo, falling deeper into their roles, this “prison” life quickly became a real and threatening situation for many. Thirty-six hours into the experiment, prisoner #8612 was released on account of acute emotional distress, but only after (incorrectly) telling his prison-mates that they were trapped and not allowed to leave, insisting that it was no longer an experiment. This perpetuated a lot of the fears that many of the prisoners were already experiencing, which caused prisoner #819 to be released a day later after becoming hysterical in Dr. Zimbardo’s office.

The guards got even crueler and more unusual in their punishments as time progressed, forcing prisoners to participate in sexual situations such as leap-frogging each other’s partially naked bodies. They took food privileges away and forced the prisoners to insult one another. Even the prisoners fell victim to their roles of submission. At a fake parole board hearing, each of them was asked if they would forfeit all money earned should they be allowed to leave the prison immediately. Most of them said yes, then were upset when they were not granted parole, despite the fact that they were allowed to opt out of the experiment at any time. They had fallen too far into submissive roles to remember, or even consider, their rights.

On the sixth day, Dr. Zimbardo closed the experiment due to the continuing degradation of the prisoners’ emotional and mental states. While his findings were, at times, a terrifying glimpse into the capabilities of humanity, they also advanced the understanding of the psychological community. When it came to the torture done at Abu Ghraib or the Rape of Nanjing in China, Zimbardo’s findings allowed for psychologists to understand evil behavior as a situational occurrence and not always a dispositional one.

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stanford experiment wikipedia

Carried out August 15-21, 1971 in the basement of Jordan Hall, the Stanford Prison Experiment set out to examine the psychological effects of authority and powerlessness in a prison environment. The study, led by psychology professor Philip G. Zimbardo, recruited Stanford students using a local newspaper ad. Twenty-four students were carefully screened and randomly assigned into groups of prisoners and guards. The experiment, which was scheduled to last 1-2 weeks, ultimately had to be terminated on only the 6th day as the experiment escalated out of hand when the prisoners were forced to endure cruel and dehumanizing abuse at the hands of their peers. The experiment showed, in Dr. Zimbardo’s words, how “ordinary college students could do terrible things.”

Researchers: Philip Zimbardo, Craig Haney, W. Curtis Banks, David Jaffe

Primary Consultant: Carlo Prescott

Additional research assistance, clerical assistance, and critical information provided by: Carolyn Burkhart, David Gorchoff, Christina Maslach, Susan Phillips, Anne Riecken, Cathy Rosenfeld, Lee Ross, Rosanne Saussotte, and Greg White.

Prison constructed by: Ralph Williams, Bob Zeiss, and Don Johann

Police cooperation through: James C. Zurcher, Chief of Police, City of Palo Alto; Joseph Sparaco, Officer, Police Department, City of Palo Alto; and Marvin Herrington, Director of Police, Stanford University

stanford experiment wikipedia

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The Stanford Prison Experiment

The Stanford Prison Experiment (2015)

In 1971, twenty-four male students 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. In 1971, twenty-four male students 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. In 1971, twenty-four male students 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.

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  • Trivia Although never mentioned in the movie, the real life experiment was funded by the U.S. Office of Naval Research and was of interest to both the U.S. Navy and Marine Corps as an investigation into the causes of conflict between military guards and prisoners.
  • Goofs When Dr. Zimbardo speaks with his colleague, the colleague says that he will see him at the beginning of the semester. Stanford does not have semesters; rather, it has a quarter academic calendar.

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.

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  • Jul 19, 2015

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The Stanford Prison Experiment

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

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

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The Stanford Prison Experiment

stanford experiment wikipedia

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.

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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 .

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  • Kyle Patrick Alvarez
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Stanford prison experiment

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The Stanford prison experiment was a study of the psychological effects of becoming a prisoner or prison guard. The experiment was conducted in 1971 by a team of researchers led by Psychology Professor Philip Zimbardo at Stanford University . Twenty-four undergraduates were selected out of 70 to play the roles of both guards and prisoners and live in a mock prison in the basement of the Stanford psychology building. Those selected were chosen for their lack of psychological issues, crime history, and medical disabilities, in order to obtain a representative sample . Roles were assigned based on a coin toss. [ 1 ]

Prisoners and guards rapidly adapted to their roles, stepping beyond the boundaries of what had been predicted and leading to dangerous and psychologically damaging situations. One-third of the guards were judged to have exhibited "genuine" sadistic tendencies, while many prisoners were emotionally traumatized and two had to be removed from the experiment early. After being confronted by Christina Maslach, a graduate student in psychology whom he was dating, [ 2 ] and realizing that he had been passively allowing unethical acts to be performed under his direct supervision, Zimbardo concluded that both prisoners and guards had become too grossly absorbed in their roles and terminated the experiment after six days. [ 3 ]

Ethical concerns surrounding the famous experiment often draw comparisons to the Milgram experiment , which was conducted in 1961 at Yale University by Stanley Milgram , Zimbardo's former college friend. Tom Peters and Robert H. Waterman Jr wrote in 1981 that the Milgram experiment and the Stanford prison experiment were frightening in their implications about the danger which lurks in the darker side of human nature. [ 4 ]

Goals and methods Results Conclusions Criticism of the experiment Haslam and Reicher Comparisons to Abu Ghraib Similar incidents In multimedia See also Footnotes References External links

[ edit ] Goals and methods

Zimbardo and his team set out to test the idea that the inherent personality traits of prisoners and guards were key to understanding abusive prison situations. Participants were recruited and told they would participate in a two-week "prison simulation." Of the 70 respondents, Zimbardo and his team selected the 24 males whom they deemed to be the most psychologically stable and healthy. These participants were predominantly white and middle-class .

The "prison" itself was in the basement of Stanford's Jordan Hall, which had been converted into a mock jail. An undergraduate research assistant was the "warden" and Zimbardo the "superintendent". Zimbardo set up a number of specific conditions on the participants which he hoped would promote disorientation , depersonalisation and deindividualisation .

The researchers provided weapons -- wooden batons -- and clothing that simulated that of a prison guard -- khaki shirt and pants from a local military surplus store . They were also given mirrored sunglasses to prevent eye contact .

Prisoners wore ill-fitting smocks and stocking caps. Guards called prisoners by their assigned numbers, sewn on their uniforms, instead of by name. A chain around their ankles reminded them of their roles as prisoners.

The researchers held an "orientation" session for guards the day before the experiment, during which they were told that they could not physically harm the prisoners. In The Stanford Prison Study video, quoted in Haslam & Reicher, 2003, Zimbardo is seen telling the guards, "You can create in the prisoners feelings of boredom, a sense of fear to some degree, you can create a notion of arbitrariness that their life is totally controlled by us, by the system, you, me, and they'll have no privacy… We're going to take away their individuality in various ways. In general what all this leads to is a sense of powerlessness. That is, in this situation we'll have all the power and they'll have none."

The participants who had been chosen to play the part of prisoners were "arrested" at their homes and "charged" with armed robbery. The local Palo Alto police department assisted Zimbardo with the arrests and conducted full booking procedures on the prisoners, which included fingerprinting and taking mug shots. At the prison, they were transported to the mock prison where they were strip-searched and given their new identities.

[ edit ] Results

The experiment quickly grew out of hand. Prisoners suffered — and accepted — sadistic and humiliating treatment from the guards. The high level of stress progressively led them from rebellion to inhibition. By the experiment's end, many showed severe emotional disturbances.

After a relatively uneventful first day, a riot broke out on the second day. The guards volunteered to work extra hours and worked together to break the prisoner revolt, attacking the prisoners with fire extinguishers without supervision from the research staff.

A false rumor spread that one of the prisoners, who asked to leave the experiment, would lead companions to free the rest of the prisoners. The guards were forced to dismantle the prison and move the inmates to another secure location. When no breakout attempt occurred, the guards were angry about having to rebuild the prison, so they took it out on the prisoners.

Guards forced the prisoners to count off repeatedly as a way to learn their prison numbers, and to reinforce the idea that this was their new identity. Guards soon used these prisoner counts as another method to harass the prisoners, using physical punishment such as protracted exercise for errors in the prisoner count. Sanitary conditions declined rapidly, made worse by the guards refusing to allow some prisoners to urinate or defecate. As punishment, the guards would not let the prisoners empty the sanitation bucket. Mattresses were a valued item in the spartan prison, so the guards would punish prisoners by removing their mattresses, leaving them to sleep on concrete. Some prisoners were forced to go nude as a method of degradation, and some were subjected to sexual humiliation, including simulated homosexual sex.

Zimbardo cited his own absorption in the experiment he guided, and in which he actively participated as Prison Superintendent. On the fourth day, some prisoners were talking about trying to escape. Zimbardo and the guards attempted to move the prisoners to the more secure local police station, but officials there said they could no longer participate in Zimbardo's experiment.

Several guards became increasingly cruel as the experiment continued. Experimenters said that approximately one-third of the guards exhibited genuine sadistic tendencies. Interestingly, most of the guards were upset when the experiment concluded early.

Zimbardo argued that the prisoner participants had internalized their roles, based on the fact that some had stated that they would accept parole even with the attached condition of forfeiting all of their experiment-participation pay. Yet, when their parole applications were all denied, none of the prisoner participants quit the experiment. Zimbardo argued they had no reason for continued participation in the experiment after having lost all monetary compensation, yet they did, because they had internalized the prisoner identity, they thought themselves prisoners, hence, they stayed.

Prisoner No. 416, a newly admitted stand-by prisoner, expressed concern over the treatment of the other prisoners. The guards responded with more abuse. When he refused to eat his sausages, saying he was on a hunger strike, guards confined him in a closet and called it solitary confinement . [ 5 ] The guards used this incident to turn the other prisoners against No. 416, saying the only way he would be released from solitary confinement was if they gave up their blankets and slept on their bare mattresses, which all but one refused to do.

Zimbardo concluded the experiment early when Christina Maslach, a graduate student he was then dating (and later married), objected to the appalling conditions of the prison after she was introduced to the experiment to conduct interviews. Zimbardo noted that of more than fifty outside persons who had seen the prison, Maslach was the only one who questioned its morality. After only six days of a planned two weeks' duration, the Stanford Prison experiment was shut down.

[ edit ] Conclusions

The Stanford experiment ended on August 20, 1971, only 6 days after it began instead of the 14 it was supposed to have lasted. The experiment's result has been argued to demonstrate the impressionability and obedience of people when provided with a legitimizing ideology and social and institutional support. It is also used to illustrate cognitive dissonance theory and the power of authority .

In psychology, the results of the experiment are said to support situational attributions of behaviour rather than dispositional attribution . In other words, it seemed the situation caused the participants' behaviour, rather than anything inherent in their individual personalities . In this way, it is compatible with the results of the also-famous Milgram experiment , in which ordinary people fulfilled orders to administer what appeared to be damaging electric shocks to a confederate of the experimenter.

Shortly after the study had been completed, there were bloody revolts at both the San Quentin and Attica prison facilities, and Zimbardo reported his findings on the experiment to the U.S. House Committee on the Judiciary .

[ edit ] Criticism of the experiment

The experiment was widely criticized as being unethical and bordering on unscientific . Current ethical standards of psychology would not permit such a study to be conducted today. The study would violate the American Psychological Associate Ethics Code, the Canadian Code of Conduct for Research Involving Humans, and the Belmont Report . Critics including Erich Fromm challenged how readily the results of the experiment could be generalized. Fromm specifically writes about how the personality of an individual does in fact affect behavior when imprisoned (using historical examples from the Nazi concentration camps ). This runs counter to the study's conclusion that the prison situation itself controls the individual's behavior. Fromm also argues that the amount of sadism in the "normal" subjects could not be determined with the methods employed to screen them.

Because it was a field experiment , it was impossible to keep traditional scientific controls . Dr Zimbardo was not merely a neutral observer , but influenced the direction of the experiment as its "superintendent". Conclusions and observations drawn by the experimenters were largely subjective and anecdotal , and the experiment would be difficult for other researchers to reproduce .

Some of the experiment's critics argued that participants based their behavior on how they were expected to behave, or modelled it after stereotypes they already had about the behavior of prisoners and guards. In other words, the participants were merely engaging in role-playing . Another problem with the experiment was certain guards, such as "John Wayne", changed their behavior because of wanting to conform to the behavior that they thought Zimbardo was trying to elicit. In response, Zimbardo claimed that even if there was role-playing initially, participants internalized these roles as the experiment continued.

Additionally, it was criticized on the basis of ecological validity . Many of the conditions imposed in the experiment were arbitrary and may not have correlated with actual prison conditions, including blindfolding incoming "prisoners", not allowing them to wear underwear, not allowing them to look out of windows and not allowing them to use their names. Zimbardo argued that prison is a confusing and dehumanizing experience and that it was necessary to enact these procedures to put the "prisoners" in the proper frame of mind; however, it is difficult to know how similar the effects were to an actual prison, and the experiment's methods would be difficult to reproduce exactly so that others could test them.

Some said that the study was too deterministic : reports described significant differences in the cruelty of the guards, the worst of whom came to be nicknamed "John Wayne." (This guard alleges he started the escalation of events between "guards" and "prisoners" after he began to emulate a character from the Paul Newman film Cool Hand Luke . He further intensified his actions because he was nicknamed "John Wayne" though he was trying to mimic actor Strother Martin who played the role of the sadistic "Captain" in the movie. [ 6 ] ) Most of the other guards were kinder and often did favors for prisoners. Zimbardo made no attempt to explain or account for these differences.

Also, it has been argued that selection bias may have played a role in the results. Researchers from Western Kentucky University recruited students for a study using an advertisement similar to the one used in the Stanford Prison Experiment, with and without the words "prison life." It was found that students volunteering for a prison life study possessed dispositions toward abusive behavior.

Additionally, the sample size was very small, with only 24 participants taking part over a relatively short period of time. This reality means that it is difficult to generalize across a wider scale.

Finally, the study was never published in a peer-reviewed journal. Lacking peer-review, it is difficult to interpret the meaningfulness of the results.

[ edit ] Haslam and Reicher

Alex Haslam and Steve Reicher (2003), psychologists from the University of Exeter and University of St Andrews , conducted the BBC Prison Study [ 7 ] , a partial replication of the experiment with the assistance of the BBC , who broadcast scenes from the study in a documentary program called The Experiment . Their results and conclusions differed from Zimbardo's and led to a number of publications on tyranny, stress and leadership (moreover, unlike results from the SPE, these were published in leading academic journals; e.g., British Journal of Social Psychology , Journal of Applied Psychology , Social Psychology Quarterly ). While their procedure was not a direct replication of Zimbardo's, their study does cast further doubt on the generality of his conclusions. Specifically, it questions the notion that people slip mindlessly into role and the idea that the dynamics of evil are in any way banal. Their research also points to the importance of leadership in the emergence of tyranny (of the form displayed by Zimbardo when briefing guards in the Stanford experiment). [ 8 ] [ 9 ]

[ edit ] Comparisons to Abu Ghraib

When the Abu Ghraib military prisoner torture and abuse scandal was published in March 2004, many observers immediately were struck by its similarities to the Stanford Prison experiment — among them, Philip Zimbardo , who paid close attention to the details of the story. He was dismayed by official military and government efforts shifting the blame for the torture and abuses in the Abu Ghraib American military prison on to " a few bad apples " rather than acknowledging it as possibly systemic problems of a formally established military incarceration system.

Eventually, Zimbardo became involved with the defense team of lawyers representing Abu Ghraib prison guard Staff Sergeant Ivan "Chip" Frederick . He had full access to all investigation and background reports, testifying as an expert witness in SSG Frederick's court martial , resulting in an eight-year prison sentence for Frederick in October 2004.

Zimbardo drew on the knowledge he gained from participating in the Frederick case to write The Lucifer Effect: Understanding How Good People Turn Evil (Random House, 2007), dealing with the striking similarities between the Stanford Prison Experiment and the Abu Ghraib abuses. [ 5 ]

[ edit ] Similar incidents

In April 2007, it was reported [ 10 ] that high-school students in Waxahachie, Texas who were participating in a role-playing exercise fell into a similar abusive pattern of behavior as exhibited in the original experiment.

In 2002, as mentioned above, the BBC conducted a similar experiment in The Experiment .

[ edit ] In multimedia

  • In 1992, a documentary about the experiment was made available via the Stanford Prison Experiment website. The documentary, Quiet Rage: The Stanford Prison Experiment , was written by Zimbardo and directed and produced by Ken Musen. [ 11 ]
  • The novel Black Box , inspired by the experiment, was adapted to cinema in 2001 as Das Experiment .
  • A 30 minute 2002 BBC documentary produced and directed by Kim Duke .
  • Breathing Room , a 2008 horror film .
  • A film about the experiment, entitled The Stanford Prison Experiment , is currently in production by Maverick Films . It was written by Christopher McQuarrie and Tim Talbott is said to feature actors Channing Tatum , Paul Dano , Ryan Phillippe , Giovanni Ribisi , Benjamin McKenzie , Charlie Hunnam , Kieran Culkin , Jesse Eisenberg , and Dylan Purcell , and is slotted for release in 2009.

[ edit ] See also

  • Das Experiment , a 2001 German film directed by Oliver Hirschbiegel , inspired by the Stanford events.
  • The Wave , a novel by Todd Strasser based on the incident
  • The Wave , a short film based on the incident
  • The Wave , a 2008 feature film based on the incident
  • Milgram experiment on obedience to authority
  • Peer pressure
  • Lord of the Flies , a 1954 novel by William Golding , in which a group of youths degrade into dictatorship
  • The Dispossessed , a 1974 novel by Ursula K. Le Guin , in which the protagonist Shevek took the part of a jail guard in a childhood game with very similar conditions and outcome.
  • The Tipping Point: How Little Things Can Make a Big Difference , a book by Malcolm Gladwell , addresses this experiment.
  • Abu Ghraib torture and prisoner abuse
  • My Big Fat Greek Rush Week , an episode of the Veronica Mars television series depicting an experiment modeled on the Stanford Prison Experiment.
  • When I Was Ming the Merciless a science fiction short story by Gene Wolfe , discusses an experiment similar to the Stanford Prison Experiment.
  • Life an NBC TV series alluded to this experiment with the episode "Not for Nothing" in which a murder takes place during a similar experiment.

[ edit ] Footnotes

  • ^ Slideshow on official site
  • ^ Stanford University News Service - The Standard Prison Experiment
  • ^ Stanford Prison Experiment - Conclusion.
  • ^ Peters, Thomas, J., , Waterman, Robert. H. , " In Search of Excellence ", 1981. Cf. p.78 and onward.
  • ^ a b The Lucifer Effect website
  • ^ "John Wayne" (name withheld). Interview. "The Science of Evil." Primetime. Basic Instincts. KATU. 3 Jan. 2007.
  • ^ The BBC Prison Study
  • ^ see interviews at http://education.guardian.co.uk/academicexperts/story/0,,1605313,00.html and http://www.offthetelly.co.uk/interviews/experiment.htm
  • ^ for details of the BBC Prison study see http://bbcprisonstudy.org/
  • ^ Holocaust Lesson Gets Out Of Hand , http://www.smh.com.au/news/world/jews-and-germans-lesson-gets-out-of-hand/2007/04/11/1175971162172.html
  • ^ Justice videos

[ edit ] References

  • Carnahan, C. & McFarland, S. (2007). Revisiting the Stanford Prison Experiment: Could Participant Self-Selection Have Led to the Cruelty? Personality and Social Psychology Bulletin , Vol. 33, No. 5, 603-614.
  • Haney, C., Banks, W. C., & Zimbardo, P. G. (1973). Study of prisoners and guards in a simulated prison. Naval Research Reviews , 9, 1–17. Washington, DC: Office of Naval Research
  • Haney, C., Banks, W. C., & Zimbardo, P. G. (1973). Interpersonal dynamics in a simulated prison. International Journal of Criminology and Penology , 1, 69–97.
  • Haslam, S. Alexander & Reicher, Stephen (2003). Beyond Stanford: Questioning a role-based explanation of tyranny. Dialogue (Bulletin of the Society for Personality and Social Psychology) , 18, 22–25.
  • Musen, K. & Zimbardo, P. G. (1991). Quiet rage: The Stanford prison study . Videorecording. Stanford, CA: Psychology Dept., Stanford University.
  • Reicher, Stephen., & Haslam, S. Alexander. (2006). Rethinking the psychology of tyranny: The BBC Prison Study. British Journal of Social Psychology , 45, 1–40.
  • Zimbardo, P. G. (1971). The power and pathology of imprisonment. Congressional Record . (Serial No. 15, 1971-10-25). Hearings before Subcommittee No. 3, of the Committee on the Judiciary, House of Representatives, Ninety-Second Congress, First Session on Corrections, Part II, Prisons, Prison Reform and Prisoner's Rights: California. Washington, DC: U.S. Government Printing Office.
  • Zimbardo, P. G (2007) Understanding How Good People Turn Evil . Interview transcript. "Democracy Now!", March 30, 2007. Accessed March 31, 2007

[ edit ] External links

  • Official Site
  • Homepage of Philip Zimbardo
  • Summary of the experiment
  • Zimbardo, P. (2007). From Heavens to Hells to Heroes . In-Mind Magazine.
  • Fromm's criticism of the experiment
  • The official website of the BBC Prison Study
  • The Experiment (IMDb) — German movie (Das Experiment) from 2001 inspired by the Stanford Experiment
  • The Lie of the Stanford Prison Experiment — Criticism from Carlo Prescott, ex-con and consultant/assistant for the experiment
  • The Artificial Prison of the Human Mind Article with Comments.
  • Philip Zimbardo on Democracy Now! March 30 2007
  • Philip Zimbardo on The Daily Show, March, 2007

Abu Ghraib and the experiment:

  • BBC News: Is it in anyone to abuse a captive?
  • BBC News: Why everyone's not a torturer
  • Ronald Hilton: US soldiers' bad behavior and Stanford Prison Experiment
  • Slate.com: Situationist Ethics: The Stanford Prison Experiment doesn't explain Abu Ghraib , by William Saletan
  • IMDb: Untitled Stanford Prison Experiment Project
  • VIDEO: Talk to MIT re: new book: The Lucifer Effect
  • Edit this page

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  1. Official site

    Stanford prison experiment

  2. The Stanford Prison Experiment

    The Stanford Prison Experiment es una película del 2015 basada en el libro "The Lucifer Effect", dirigida por Kyle Patrick Alvarez y escrita por Tim Talbott y Philip Zimbardo. La película está protagonizada por Billy Crudup , Michael Angarano y Moises Arias.

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  4. Stanford prison experiment

    The Stanford prison experiment ( SPE) was a psychological experiment conducted in August 1971. It was a two-week simulation of a prison environment that examined the effects of situational variables on participants' reactions and behaviors. Stanford University psychology professor Philip Zimbardo led the research team who administered the study.

  5. Stanford prison experiment

    The Stanford Prison Experiment (SPE) was a psychology experiment to see the effects of becoming a prisoner or a prison guard on human behaviour and psychology. [1] The experiment ran from 15 to 21 August 1971. It was led by Dr Philip Zimbardo at Stanford University.

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    The Stanford Prison Experiment is a 2015 American docudrama psychological thriller film directed by Kyle Patrick Alvarez, written by Tim Talbott, and starring Billy Crudup, Michael Angarano, Ezra Miller, Tye Sheridan, Keir Gilchrist, Olivia Thirlby, and Nelsan Ellis.The plot concerns the 1971 Stanford prison experiment, conducted at Stanford University under the supervision of psychology ...

  7. Stanford Prison Experiment

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  10. Philip Zimbardo

    Philip George Zimbardo (/ z ɪ m ˈ b ɑːr d oʊ /; born March 23, 1933) is an American psychologist and a professor emeritus at Stanford University. [1] He became known for his 1971 Stanford prison experiment, which was later severely criticized for both ethical and scientific reasons.He has authored various introductory psychology textbooks for college students, and other notable works ...

  11. Stanford prison experiment

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  13. What the Stanford Prison Experiment Taught Us

    The Editors of Encyclopaedia Britannica. PrisonExp.org. In August of 1971, Dr. Philip G. Zimbardo of Stanford University in California conducted what is widely considered one of the most influential experiments in social psychology to date. Made into a New York Times best seller in 2007 ( The Lucifer Effect) and a major motion picture in 2015 ...

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  25. The Stanford Prison Experiment movie review (2015)

    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.

  26. Stanford prison experiment

    The Stanford prison experiment was a study of the psychological effects of becoming a prisoner or prison guard. The experiment was conducted in 1971 by a team of researchers led by Psychology Professor Philip Zimbardo at Stanford University.Twenty-four undergraduates were selected out of 70 to play the roles of both guards and prisoners and live in a mock prison in the basement of the Stanford ...