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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ABSTRACT: This study examined the effect of preparatory interval (PI) lenght on the reaction time (RT) of extraverts (Es) and introverts (Is). In addition to displaying a significantly slower overall mean RT than Es, Is also tended to be more adversely affected by longer PI duration (P = 0.06). That is, unlike Es, Is tended to show a much greater increase in RT to an 8-sec PI duration as compared to a 4-sec PI duration. Examination of the influence of psychoticism (P) and neuroticism (N) effects on the performance of Es and Is indicated that N had no effect for this sample of subjects. However, high levels of P tended to lead to a decrease in the overall mean RT of ES while it tended to increase the RT scores of Is. P did not, however, have an effect on the PI responding of Es and Is. Discussion of these results centered on certain parallels between the performance of introverts and schizophrenic subjects concerning deficits in attention during RT performance.
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