Deductive reasoning in schizophrenia.

Abstract
The Von Domarus principle, as formulated by Von Domarus and Arieti, was subjected to critical and empirical review. Previous studies on the Von Domarus principle were judged inadequate on the bases of unwarranted interpretation and restricted scope. 50 hospitalized normal patients and 50 schizophrenic patients were administered a 96-item syllogistic test and verbal IQ test. The 1st 3 figures of the traditional syllogism were used and 4 content categories: abstract, concrete, personal, and nonpersonal. No significant differences were found between the 2 groups on the experimental items. Contrary to expectation, the figure (II) describing the Von Domarus principle was the easiest of the 3 figures. The author suggests that a different conceptual approach be used in examining schizophrenic thinking. (30 ref.) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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