Author Susannah Cahalan discusses new book ‘The Great Pretender’

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Susannah Cahalan, the bestselling author of the 2012 book “Brain on Fire,” joins the 3rd hour of TODAY to discuss her latest read, “The Great Pretender.” In it, Cahalan delves into the finding of a 1970s study by Dr. David Rosenhan and seven others, who committed themselves to psychiatric hospitals across America to investigate the state of care for mentally ill patients.