BRAIN IMAGINGPrefrontal functional dissociation in the semantic network of patients with schizophreniaPark, Il Hoa c; Park, Hae-Jeonga b; Chun, Ji-Wonc; Kim, Eung Yeopb; Kim, Jae-Jina b cAuthor Information Departments of aPsychiatry bDiagnostic Radiology cInstitute of Behavioral Science in Medicine, Yonsei University College of Medicine, Seoul, Korea Correspondence to Dr Jae-Jin Kim, MD, PhD, Yongdong Severance Hospital, 612 Eonjuro, Gangnam-gu, Seoul 135-720, Korea Tel: +82 2 2019 3341; fax: +82 2 3462 4304; e-mail: [email protected], [email protected] Received 29 May 2008; accepted 12 June 2008 NeuroReport: September 17th, 2008 - Volume 19 - Issue 14 - p 1391-1395 doi: 10.1097/WNR.0b013e32830cebff Buy SDC Metrics Abstract We examined whether deficient prefrontal control over the semantic network exists in patients with schizophrenia. Fourteen patients with schizophrenia and 14 healthy controls performed a comparison task, judging semantic congruity according to an abstract category in an event-related functional MRI paradigm. In the control group, prefrontal–temporal networks consisting of the left inferior frontal gyrus and right inferior frontal sulcus converging at the left posterior superior temporal sulcus were identified as activated during semantic demand of incongruence. In the patients with schizophrenia, we observed a loss of the recruitment of the right inferior frontal sulcus and the prefrontal–temporal network. These findings indicate that cognitive modulation of semantic processing may be dysfunctional in patients with schizophrenia. © 2008 Lippincott Williams & Wilkins, Inc.