Introversion-extroversion and the functional psychoses.
Journal of Applied Psychology (Impact Factor: 4.31). 05/1934; 18(3):478-488. DOI: 10.1037/h0071426
Comparisons between manic-depressive and schizophrenic patients and normal individuals on the Heidbreder and the Neymann-Kohlstedt tests of introversion-extroversion show that (1) the decreasing order of extroversion is: normal, manic-depressive patients, schizophrenic patients; (2) each psychotic group resembles the other more than either resembles the group of normal individuals; (3) no relationship exists between introversion-extroversion and prognosis in functional psychoses; (4) asthenic patients seem to be more introverted than pyknic patients. (PsycINFO Database Record (c) 2012 APA, all rights reserved)
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