University of Michigan - Ann Arbor

The Stanford Prison Experiment, a renowned psychological study conducted by Philip Zimbardo at Stanford University in 1971, was designed to demonstrate the power of situational factors like social roles, norms, and scripts on behavior. The study, which was advertised as an investigation into the psychological effects of prison life, had to be terminated after only six days due to the extreme and abusive behavior of participants assigned as 'guards' and the severe emotional distress experienced by those assigned as 'prisoners'.

Stanford Prison Experiment

What was a significant finding of the Stanford Prison Experiment?

Why was the Stanford Prison Experiment terminated early?

What ethical concerns were raised by the Stanford Prison Experiment?

What was the main purpose of the Stanford Prison Experiment?

The primary finding of the Stanford Prison Experiment was that situational factors are a powerful determinant of behavior, often overriding individual personality traits. Participants quickly adopted their assigned social roles, with 'guards' becoming abusive and 'prisoners' becoming passive and distressed. This powerful conformity to social scripts extended even to the lead researcher, Philip Zimbardo, who became so immersed in his role as 'prison supervisor' that he lost his scientific objectivity and began to act as if the situation were real.

Findings of the Stanford Prison Experiment

The Stanford Prison Experiment has drawn substantial criticism on multiple fronts. Ethically, it is condemned for the psychological distress it caused participants. Methodologically, its validity is challenged due to several flaws, including potential recruitment bias, the presence of strong demand characteristics stemming from Zimbardo's instructions, issues with generalizability, and the failure of subsequent studies to replicate its findings.

Criticisms of the Stanford Prison Experiment

The experiment was staged in a mock prison constructed in the basement of Stanford University's psychology building. To increase the study's realism, participants assigned to the prisoner role were unexpectedly 'arrested' at their residences by actual Palo Alto police officers, processed at a police station, and then transported to the simulated prison.

Setup of the Stanford Prison Experiment

In the experiment, participants assigned as 'guards' rapidly and enthusiastically embraced their roles, with their behavior escalating to sadistic levels in a very short time. By the second day, their harassment of 'prisoners' involved stripping them, confiscating their beds, using solitary confinement, denying privacy, removing basic comforts like mattresses, and imposing degrading chores and late-night counts.

Escalation of Guard Behavior in the Stanford Prison Experiment

The participants assigned to the prisoner role quickly began to exhibit signs of severe emotional distress. They developed anxiety and a sense of hopelessness, eventually becoming passive and starting to tolerate the abusive treatment from the guards.

Psychological Effects on 'Prisoners' in the Stanford Prison Experiment

The Stanford Prison Experiment is often compared to the abuse of prisoners of war by U.S. Army and CIA personnel at the Abu Ghraib prison during the Iraq War. In 2003 and 2004, these personnel committed offenses against prisoners that were documented in photographs, some of which were taken by the abusers themselves. Philip Zimbardo, the lead researcher of the Stanford experiment, has also publicly discussed these parallels, for instance, in an NPR interview.

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