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The term psychopath was introduced by J.L.A. Koch in his 1891 monograph, Die Psychopathischen Minderwertigkeiten, in his description of “psychopathic inferiorities.” In 1939, Henderson described psychopaths in his book Psychopathic States as those afflicted with an illness:

The term psychopathic state is the name we apply to those individuals who conform to a certain intellectual standard, sometimes high, sometimes approaching the realm of defect but yet not amounting to it, who throughout their lives, or from a comparatively early age, have exhibited disorders of conduct of an antisocial or asocial nature, usually of a recurrent or episodic type, who, in many instances, have proved difficult to influence by methods of social, penal, and medical care and treatment and for whom we have no adequate provision of ...
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