Psychopathy - Wikipedia

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In his classic monograph, The Mask of Sanity (1941), Cleckley drew on a small series of vivid case studies of psychiatric patients at a Veterans Administration hospital in Georgia to provide a description for psychopathy. Cleckley used the metaphor of the “mask” to refer to the tendency of psychopaths to appear confident, personable, and well-adjusted compared to most psychiatric patients, while revealing underlying pathology through their actions over time

Psychopathy - Wikipedia