title: Response-monitoring dysfunction in schizophrenia: an event-related brain potential study.
abstract: Error-monitoring abnormalities may underlie positive symptoms of schizophrenia. Response-synchronized event-related potentials during picture-word matching yielded error- and correct-response-related negativity (ERN, CRN) and positivity (Pe, Pc) and preresponse lateralized readiness potentials (LRP) from 18 schizophrenic patients and 18 controls. Both groups responded faster to matches than nonmatches, although patients were generally slower and made more errors to nonmatches. Compared with controls, patients, particularly with paranoid subtype, had smaller ERNs and larger CRNs, which were indistinguishable. LRPs showed evidence of more response conflict before errors than before correct responses in controls but not patients. Despite ERN/CRN abnormalities, post-error slowing and Pe were normal in patients, suggesting a dissociation of ERN and error awareness. Anterior cingulate and dorsolateral prefrontal cortical dysfunction in schizophrenia are implicated.
authors.affiliation: Department of Psychiatry, Yale University School of Medicine and Psychiatry Service and Veterans Affairs Healthcare System, West Haven, Connecticut, USA. daniel.mathalon@yale.edu
authors.forename: Daniel H
authors.initials: DH
authors.lastname: Mathalon
authors.forename: Mark
authors.initials: M
authors.lastname: Fedor
authors.forename: William O
authors.initials: WO
authors.lastname: Faustman
authors.forename: Max
authors.initials: M
authors.lastname: Gray
authors.forename: Nusha
authors.initials: N
authors.lastname: Askari
authors.forename: Judith M
authors.initials: JM
authors.lastname: Ford
mesh_terms: D000328:Adult; D001921:Brain / Q000503:physiopathology*; D004569:Electroencephalography; D004585:Electrooculography; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012559:Schizophrenia / Q000503:physiopathology*