In a dramatic study,psychologist David Rosenhan demonstrated that professional staff in mental hospitals could readily distinguish "insane" people from "sane" people.

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In fact, Rosenhan's study, published in 1973, revealed the opposite. He and several other research participants, who were all mentally healthy, presented themselves to mental hospitals with a complaint of hearing voices. Once admitted, they stopped simulating any symptoms and behaved normally, yet none were identified as imposters by the staff. They were all given a diagnosis of a mental disorder and kept in the hospital for an average of 19 days. The study raised ethical concerns about the labeling and treatment of psychiatric patients and spurred reforms in the mental healthcare system.

In a Dramatic Study,psychologist David Rosenhan Demonstrated That Professional Staff