ISSN : 1229-067X
The present study investigated frontal-executive functions in 45 schizophrenic patients and 27 normal control subjects. All subjects were administered Executive Intelligence Test (EXIT), K-Wechsler Adult Intelligence Scale (K-WAIS) and Rey-Kim Memory Test (RKMT). The major findings were as follows. Firstly, the difference between the schizophrenia group and the control group was most pronounced in executive intelligence quotient (EIQ) compared with the difference in verbal comprehension index (VCI), perceptual organization index (POI), freedom-from-distractibility index (FDI), and memory quotient (MQ). Secondly, the 4 difference scores of the EXIT are relatively pure measures of executive functions. The schizophrenic group was significantly lower than the control group in each difference score. Thirdly, of the schizophrenic group, 25 showed a clinically defective performance (i.e., ≤79) in at least one of the three summary measures--EIQ, MQ, and full-scale intelligence quotient (FIQ). Of these 25, 24 (96%) showed a defective performance in EIQ. These results suggest that frontal-executive function is one of the most defective cognitive functions in schizophrenia.
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