Reduced interhemispheric transmission in schizophrenia patients: evidence from event-related potentials.
Interhemispheric transfer was investigated in 14 schizophrenia patients and 15 age- and sex-matched healthy controls in a lateralized lexical decision task. Words and pseudowords were tachistoscopically presented either to the left or to the right visual hemifield. Event-related potentials were determined from a 65-channel electroencephalogram. Information transfer between hemispheres was assessed by the interhemispheric transmission time (IHTT), the N1-latency difference between ipsilateral and contralateral hemisphere.Controls, but not schizophrenia patients showed significantly faster IHTT from the right to the left hemisphere for words, while IHTT from the left to the right hemisphere did not differ between groups and stimuli. These findings are interpreted in terms of a deficit in schizophrenia to transfer verbal information from the right to the left hemisphere via the corpus callosum.
Endrass
Tanja
T
Department of Psychology, University of Konstanz, PO-Box D23, 78457 Konstanz, Germany. tanja.endrass@uni-konstanz.de
Mohr
Bettina
B
Rockstroh
Brigitte
B
D000328:Adult; D002540:Cerebral Cortex / Q000473:pathology / Q000503:physiopathology*; D003337:Corpus Callosum / Q000503:physiopathology*; D004569:Electroencephalography; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D007807:Language Tests; D008297:Male; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010775:Photic Stimulation; D011597:Psychomotor Performance / Q000502:physiology; D011930:Reaction Time / Q000502:physiology; D012559:Schizophrenia / Q000473:pathology / Q000503:physiopathology*; D014705:Verbal Behavior / Q000502:physiology*; D014794:Visual Fields / Q000502:physiology