The Stanford Prison Experiment . Twenty-four male students out of seventy-five were 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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Zimbardo's infamous prison experiment, A pretty unethical study, but it yielded powerful insight into human psychology. And to think, even after this study and all of the controversy surrounding it, Zimbardo went on to become president of the APA.