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This study compared the performances of matched schizophrenia patients with or without obsessive-compulsive (OC) symptoms, patients with obsessive-compulsive disorder (OCD), and control subjects on selected frontal lobe tests. Schizophrenic patients without OC were the most impaired; and OCD patients were the least, while schizophrenic patients with OC scored between these two groups.
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A. Borkowska (2003) studied this question.
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