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Titolo:
Steady-state visually evoked potential topography during the continuous performance task in normal controls and schizophrenia
Autore:
Silberstein, RB; Line, P; Pipingas, A; Copolov, D; Harris, P;
Indirizzi:
Swinburne Univ Technol, Brain Sci Inst, Hawthorn, Vic 3122, Australia Swinburne Univ Technol Hawthorn Vic Australia 3122 n, Vic 3122, Australia Mental Hlth Res Inst, Parkville, Vic 3052, Australia Mental Hlth Res InstParkville Vic Australia 3052 le, Vic 3052, Australia
Titolo Testata:
CLINICAL NEUROPHYSIOLOGY
fascicolo: 5, volume: 111, anno: 2000,
pagine: 850 - 857
SICI:
1388-2457(200005)111:5<850:SVEPTD>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
ATTENTIONAL VULNERABILITY INDICATORS; METABOLIC-ACTIVITY; NEUROLEPTIC-NAIVE; NEGATIVE SYMPTOMS; HYPOFRONTALITY; DYSFUNCTIONS; DISORDER; CIRCUITS; WAVE; EEG;
Keywords:
steady state visually evoked potential; continuous performance task; vigilance; schizophrenia; hypofrontality;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Silberstein, RB Swinburne Univ Technol, Brain Sci Inst, POB 218, Hawthorn,Vic 3122, Australia Swinburne Univ Technol POB 218 Hawthorn Vic Australia 3122
Citazione:
R.B. Silberstein et al., "Steady-state visually evoked potential topography during the continuous performance task in normal controls and schizophrenia", CLIN NEU, 111(5), 2000, pp. 850-857

Abstract

Objectives: To examine the latency topography of the steady-state visuallyevoked potential (SSVEP) in patients diagnosed with schizophrenia and normal controls while undertaking a visual vigilance task. Methods: Twenty patients diagnosed with schizophrenia and 18 normal controls performed the A-X version of the continuous performance task (CPT A-X) when subjects are required to press a micro-switch on the unpredictable appearance of an 'X' that had been preceded by an 'A. ' Brain electrical activity was recorded from 64 scalp sites and a 13 Hz spatially uniform visual flicker presented with the task was used to elicit a steady-state visually evoked potential (SSVEP). Results: Following the appearance of the 'A' and 'X,' the control group demonstrated a transient SSVEP latency reduction at parietal and prefrontal sites. By contrast, the patients group showed no such SSVEP latency reduction. The prefrontal SSVEP latency changes in the 500 ms interval following the appearance of the 'X' were correlated with mean individual reaction time in both populations. Conclusions: We suggest that the SSVEP latency reduction may index excitatory processes and that the absence of prefrontal SSVEP latency reduction inschizophrenic patients may be a manifestation of reduced prefrontal activity or 'hypofrontality' observed with other neuroimaging modalities. (C) 2000 Elsevier Science Ireland Ltd. All rights reserved.

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Documento generato il 24/11/20 alle ore 13:56:59