In 1973, a Stanford psychologist released a study challenging the validity of psychiatry diagnoses. Decades later when journalist Susannah Cahalan was admitted to hospital with delusions and paranoia, the way doctors evaluated her can be traced to that study. They said she was mad. They were wrong. She re-examines the study and the repercussions it's had on mental health treatment in her new book, The Great Pretender: The Undercover Mission That Changed Our Understanding of Madness.
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