The Mask of Sanity: An Attempt to Clarify Some Issues About the So-Called Psychopathic Personality is a book written by American psychiatrist Hervey M. Cleckley, first published in 1941, describing Cleckley's clinical interviews with patients in a locked institution. The text is considered to be a seminal work and the most influential clinical description of psychopathy in the twentieth century. The basic elements of psychopathy outlined by Cleckley are still relevant today. The title refers to the normal "mask" that conceals the mental disorder of the psychopathic person in Cleckley's conceptualization.
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Dr. Hervey Milton Cleckley, a pioneer in the study of psychopathy, delved into the deceptive connection between apparent normalcy and concealed mental disorder. His work explored the intriguing paradox of individuals who present an outward facade of sanity, while beneath this "mask" lies a profound psychological disturbance. Through his influential clinical observations, Cleckley illuminated the subtle ways in which a person can seem outwardly sound, yet harbor a hidden psychosis. His insights continue to shape our understanding of the complex nature of the human psyche and the hidden realities it can contain.

- 2016