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Participant Selection in the Stanford Prison Experiment

In the summer of 1971, researchers recruited male volunteers via a California newspaper advertisement for a study on the psychological effects of prison life. Over 70 men responded, and those with psychiatric problems, medical conditions, or histories of crime or drug abuse were screened out through psychological testing. The remaining pool was narrowed to 24 healthy male college students. Each participant was paid $15 per day (equivalent to roughly $80 today) and was randomly assigned to portray either a prisoner or a guard.

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Updated 2026-05-17

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