Tehran University of Medical Sciences Iranian Journal of Psychiatry 1735-4587 9 3 2014 09 15 152 7 Zahra Ezzatpanah Institute for Cognitive Science Studies, Tehran, Iran Seyed Vahid Shariat Institute for Cognitive Science Studies, Tehran, Iran ; Mental Health Research Center and Department of Psychiatry, Tehran Institute of Psychiatry, School of Behavioral Sciences and Mental Health, Iran University of Medical Sciences, Tehran, Iran Mehdi Tehrani-Doost Institute for Cognitive Science Studies, Tehran, Iran ; Department of Psychiatry, Roozbeh Hospital, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran 2015 10 14 Objective: The purpose of this research was to study the cognitive functions in patients with methamphetamine-induced psychosis (MIP) in comparison with schizophrenia patients and normal subjects. Method: This was a cross-sectional study, 30 patients with MIP, 30 patients with schizophrenia and 30 normal individuals were selected via convenient sampling and were matched on age, sex and education. Wisconsin Cards Sorting, Stroop, Visual Search and Attention and Wechsler Memory Tests were used to assess the subjects. Results: The study showed that patients with MIP and schizophrenia have more deficits in executive functions, selective attention, sustained attention and memory than normal subjects. There were no significant differences in cognitive functions between patients with MIP and schizophrenia except for visual search and attention that showed more impairment in patients with schizophrenia. Conclusion: Although, cognitive dysfunctions of patients with MIP are mostly similar to patients with schizophrenia, some differences seem to exist, especially in those functions that are not primarily dependent on frontal lobe. https://ijps.tums.ac.ir/index.php/ijps/article/view/49 https://ijps.tums.ac.ir/index.php/ijps/article/download/49/45