The present research was designed to investigate the cognitive and motor inhibition in persons suffering from obsessive compulsive and schizophrenic disorders and comparing them with a normal group. 90 persons with obsessive compulsive and schizophrenic disorders and normal persons (30 persons in each group) age range between 25-45 were selected. The participants were asked to answer individually the computer based form of the stroop test (Golen, 1978), as index of cognitive inhibition and stop signal task (Gorlyn, Keilp, Tryon & Mann, 2005), of motor inhibition. Results indicated that persons with schizophrenic disorder in both the cognitive and motor inhibitions performed significantly poorer than obsessive compulsive and normal persons but there was no significant difference between obsessive compulsive and normal groups. The group with schizophrenic disorder performed significantly poorer than the obsessive compulsive group in cognitive inhibition but there was no significant difference in motor inhibition between these two groups. Therefore, on the basis of results it can be concluded that poor cognitive and motor inhibition have an important role in the pathology of schizophrenic disorder and in obsessive compulsive disorder, despite relative poor motor inhibition, is a need for there designing more careful studies.

Keywords: cognitive inhibition, motor inhibition, obsessive compulsive disorder, schizophrenia

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