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Type: Journal article
Title: Spatio-temporal EEG waves in first episode schizophrenia
Author: Alexander, D.
Flynn, G.
Wong, W.
Whitford, T.
Harris, A.
Galletly, C.
Silverstein, S.
Citation: Clinical Neurophysiology, 2009; 120(9):1667-1682
Publisher: Elsevier Sci Ireland Ltd
Issue Date: 2009
ISSN: 1388-2457
Statement of
David M. Alexander, Gary J. Flynn, Wilson Wong, Thomas J. Whitford, Anthony W.F. Harris, Cherrie A. Galletly and Steven M. Silverstein
Abstract: OBJECTIVE: Schizophrenia is characterized by a deficit in context processing, with physiological correlates of hypofrontality and reduced amplitude P3b event-related potentials. We hypothesized an additional physiological correlate: differences in the spatio-temporal dynamics of cortical activity along the anterior-posterior axis of the scalp. METHODS: This study assessed latency topographies of spatio-temporal waves under task conditions that elicit the P3b. EEG was recorded during separate auditory and visual tasks. Event-related spatio-temporal waves were quantified from scalp EEG of subjects with first episode schizophrenia (FES) and matched controls. RESULTS: The P3b-related task conditions elicited a peak in spatio-temporal waves in the delta band at a similar latency to the P3b event-related potential. Subjects with FES had fewer episodes of anterior to posterior waves in the 2-4 Hz band compared to controls. Within the FES group, a tendency for fewer episodes of anterior to posterior waves was associated with high Psychomotor Poverty symptom factor scores. CONCLUSIONS: Subjects with FES had altered global EEG dynamics along the anterior-posterior axis during task conditions involving context update. SIGNIFICANCE: The directional nature of this finding and its association with Psychomotor Poverty suggest this result is related to findings of hypofrontality in schizophrenia.
Keywords: Schizophrenia; EEG dynamics; P3b ERP; Psychomotor Poverty; Hypofrontality
Rights: Crown Copyright Copyright 2009 Published by Elsevier Ireland Ltd. on behalf of International Federation of Clinical Neurobiology. All rights reserved.
RMID: 0020091560
DOI: 10.1016/j.clinph.2009.06.020
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Appears in Collections:Psychiatry publications

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