Findings about the impairment of executive functions in schizophrenia are not conclusive. The authors hypothesized that the severity of the impairments in the abilities that comprise EF might be different. Forty patients were assessed with a comprehensive battery that included four measures of executive functions and were compared with 60 healthy subjects. Set shifting and response inhibition showed no significant between-group differences. Mental flexibility and concept formation were significantly worse in patients, but the effect sizes were small. Some executive functions might be relatively spared, at least in the early phase of schizophrenia. Studies on individual executive functions may yield more replicable findings.
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