Eysenck, Hans Jurgen (häns yŏrˈgən Īˈsĕngk) [key], 1916–97, British psychologist. Best known for his theory of human personality, Eysenck suggested that personality is biologically determined and is arranged in a hierarchy consisting of types, traits, habitual responses, and specific responses. A staunch critic of psychoanalysis, Eysenck maintained that the recovery rates of the emotionally disturbed were approximately equal for treated and untreated individuals, though the accuracy of his studies on the subject have been questioned in recent years. Among Eysenck's many works is The Intelligence Controversy (written with L. J. Kamin, 1981).
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