Tehran University of Medical Sciences Iranian Journal of Psychiatry 1735-4587 5 2 2010 06 15 74 77 Habibolah Khazaie Sleep Research Center, Department of Psychiatry, Kermanshah University of Medical Sciences (KUMS), Iran Masoud Tahmasian Sleep Research Center, Department of Psychiatry, Kermanshah University of Medical Sciences (KUMS), Iran Mohammad R Ghadami Sleep Research Center, Department of Psychiatry, Kermanshah University of Medical Sciences (KUMS), Iran Hooman Safaei Neurocognitive Laboratory, Iranian National Center for Addiction Studies, Tehran University of Medical Sciences, Tehran, Iran Hamed Ekhtiari Neurocognitive Laboratory, Iranian National Center for Addiction Studies, Tehran University of Medical Sciences, Tehran, Iran Sara Samadzadeh Sleep Research Center, Department of Psychiatry, Kermanshah University of Medical Sciences (KUMS), Iran David C Schwebel Department of Psychology, University of Alabama at Birmingham, USA Michael B Russo John A. Burns School of Medicine, University of Hawaii, USA 2015 10 14 Objective: Because of on-call responsibilities, many medical residents are subjected to chronic partial sleep deprivation, a form of sleep restriction whereby individuals have chronic patterns of insufficient sleep. It is unclear whether deterioration in cognitive processing skills due to chronic partial sleep deprivation among medical residents would influence educational exposure or patient safety. Method: Twenty-six medical residents were recruited to participate in the study. Participants wore an Actigraph over a period of 5 consecutive days and nights so their sleep pattern could be recorded. Thirteen participants worked on services that forced chronic partial sleep deprivation (<6 hours of sleep per 24h for 5 consecutive days and nights). The other thirteen residents worked on services that permitted regular and adequate sleep patterns. Following the 5-day sleep monitoring period, the participants completed the three following cognitive tasks: (a) the Wisconsin Card Sorting Test (WCST) to assess abstract reasoning and prefrontal cortex performance; (b) the Time Perception Task (TPT) to assess time estimation and time reproduction skills; and (c) the Iowa Gambling Task (IGT) to assess decision-making ability. Results: The results of independent samples t-tests found no significant differences between the group who was chronically sleep deprived and the group who rested adequately (all ps > .05). Conclusion: These results may have emerged for several possible reasons: (a) chronic partial sleep deprivation may have a lesser impact on prefrontal cortex function than on other cognitive functions; (b) fairly modest chronic sleep restriction may be less harmful than acute and more significant sleep restriction; or (c) our research may have suffered from poor statistical power. Future research is recommended. https://ijps.tums.ac.ir/index.php/ijps/article/view/370 https://ijps.tums.ac.ir/index.php/ijps/article/download/370/366