Introversion-extraversion and psychiatric diagnoses: a test of Eysenck's hypothesis.

Eysenck has stated that dysthymics were introverted and psychopaths were extraverted This study tested this hypothesis. The Ss were 28 male and 7 female inpatients from a state mental hospital. Twenty were diagnosed as neurotics, 15 as psychopaths. The sample was divided into extravert-introvert groups on the basis of scores on the Meyers-Briggs Type Indicator. Chi-square analysis revealed no significant differences in patient distribution by type and diagnosis. It was concluded that extraversion-introversion scores would not aid in the diagnosis of neurosis or psychopathy.