title: Reduced communication between frontal and temporal lobes during talking in schizophrenia.
abstract: BACKGROUND
  Communication between the frontal lobes, where speech and verbal thoughts are generated, and the temporal lobes, where they are perceived, may occur through the action of a corollary discharge. Its dysfunction may underlie failure to recognize inner speech as self-generated and account for auditory hallucinations in schizophrenia.
  
  
  METHODS
  Electroencephalogram was recorded from 10 healthy adults and 12 patients with schizophrenia (DSM-IV) in two conditions: talking aloud and listening to their own played-back speech. Event-related electroencephalogram coherence to acoustic stimuli presented during both conditions was calculated between frontal and temporal pairs, for delta, theta, alpha, beta, and gamma frequency bands.
  
  
  RESULTS
  Talking produced greater coherence than listening between frontal-temporal regions in all frequency bands; however, in the lower frequencies (delta and theta), there were significant interactions of group and condition. This finding revealed that patients failed to show an increase in coherence during talking, especially over the speech production and speech reception areas of the left hemisphere, and especially in patients prone to hallucinate.
  
  
  CONCLUSIONS
  Reduced fronto-temporal functional connectivity may contribute to the misattribution of inner thoughts to external voices in schizophrenia.
authors.affiliation: Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, California 94305-5550, USA.
authors.forename: Judith M
authors.initials: JM
authors.lastname: Ford
authors.forename: Daniel H
authors.initials: DH
authors.lastname: Mathalon
authors.forename: Susan
authors.initials: S
authors.lastname: Whitfield
authors.forename: William O
authors.initials: WO
authors.lastname: Faustman
authors.forename: Walton T
authors.initials: WT
authors.lastname: Roth
mesh_terms: D000328:Adult; D001931:Brain Mapping; D004292:Dominance, Cerebral / Q000502:physiology; D004569:Electroencephalography; D005071:Evoked Potentials / Q000502:physiology; D005260:Female; D005625:Frontal Lobe / Q000503:physiopathology*; D006212:Hallucinations / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009415:Nerve Net / Q000503:physiopathology; D012559:Schizophrenia / Q000503:physiopathology*; D012564:Schizophrenic Language; D013067:Speech Perception / Q000502:physiology*; D013702:Temporal Lobe / Q000503:physiopathology*; D014705:Verbal Behavior / Q000502:physiology*