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Who played the learner in the Milgram experiment?

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In the Milgram experiment, the person acting as the "learner" was not a volunteer participant, but rather an actor hired by Stanley Milgram.

While the volunteer participants were led to believe that the roles of "teacher" and "learner" were assigned randomly, the process was fixed so that all volunteers were assigned the role of teacher, while the hired actors were assigned the role of the learner.12