title: Auditory P300 studies in schizophrenic subjects and their first degree relatives.
abstract: Nineteen subjects with schizophrenia, 6 subjects with related disorders (schizophrenic spectrum disorders (S.S.D.)), and 20 unaffected first degree relatives from a sample of schizophrenic pedigrees, together with 35 normal control subjects, had auditory P300 evoked responses measured, using the "odd-ball" paradigm for stimulation. Bipolar recording on the midline (CZOZ) and two contralateral sites (CZ-mastoid) was carried out. It was found that approximately 40% of schizophrenics/S.S.D.'s had abnormal P300 responses. Abnormalities were seen in latency, RMS response voltage and in the left side response--right side response cross correlation coefficient. Schizophrenics/S.S.D.s showed responses which were topographically different than those of normal controls. Significant left-side/right-side response voltage asymmetry was not observed. In our study, only 10% of unaffected relatives of schizophrenics/S.S.D.'s showed abnormal P300 responses.
authors.affiliation: Biophysics Department, Sir Charles Gairdner Hospital, Perth, Western Australia.
authors.forename: J L
authors.initials: JL
authors.lastname: Black
authors.forename: B J
authors.initials: BJ
authors.lastname: Mowry
authors.forename: D A
authors.initials: DA
authors.lastname: Barton
authors.forename: J N
authors.initials: JN
authors.lastname: De Roach
mesh_terms: D000293:Adolescent; D000328:Adult; D005072:Evoked Potentials, Auditory; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012559:Schizophrenia / Q000235:genetics / Q000503:physiopathology*