Objective: Neurocognitive dysfunctions have been always important specifications of psychotic disorders. Design: This study compared neuropsychological correlates in three groups including schizophrenia, bipolar, amphetamine induced psychotic disorder. Material and Methods: 60 male psychotic patients were selected with purposive sampling method in Razi psychiatric hospital and divided into three groups of twenty. Short term and long term memories, psychomotor speed and visuospatial function, verbal, practical and general intelligence were investigated by Wechsler Adult Intelligence Scale - Revised. Results: The results indicate no significant difference between groups (p< 0.05, df=2). Using the Wisconsin Card Sort Test , the difference between three patients groups was significant in terms of executive function. Perseveration error and total error was higher in patients with schizophrenia in comparison with bipolar (f=7.550, p<0.05). Conclusion: Schizophrenic patients poor performance in WCST test show that such patients are not able to design goal reaching effectively that this deficit is related to cortex dorsal-lateral frontal lobe dysfunctions.

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