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Titolo:
Steady-state visual evoked potentials and travelling waves
Autore:
Burkitt, GR; Silberstein, RB; Cadusch, PJ; Wood, AW;
Indirizzi:
Swinburne Univ Technol, Brain Sci Inst, Melbourne, Vic, Australia Swinburne Univ Technol Melbourne Vic Australia Melbourne, Vic, Australia Swinburne Univ Technol, Sch Biophys Sci & Elect Engn, Melbourne, Vic, Australia Swinburne Univ Technol Melbourne Vic Australia Melbourne, Vic, Australia
Titolo Testata:
CLINICAL NEUROPHYSIOLOGY
fascicolo: 2, volume: 111, anno: 2000,
pagine: 246 - 258
SICI:
1388-2457(200002)111:2<246:SVEPAT>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
HIGH-RESOLUTION EEG; ELECTRICAL-ACTIVITY; CORTICAL ACTIVITY; RESPONSES; SYNCHRONIZATION; CORTEX; HUMANS; TASK; COHERENCE; BRAIN;
Keywords:
steady-state visual evoked potential; travelling wave; alpha rhythm; bipolar electrodes; high resolution EEG; human;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
81
Recensione:
Indirizzi per estratti:
Indirizzo: Burkitt, GR Rockefeller Univ, Neurobiol Lab, POB 138,1230 York Ave, New York, NY 10021USA Rockefeller Univ POB 138,1230 York Ave New York NY USA 10021 A
Citazione:
G.R. Burkitt et al., "Steady-state visual evoked potentials and travelling waves", CLIN NEU, 111(2), 2000, pp. 246-258

Abstract

Objective: The amplitude and phase of the steady-state visual evoked potential (SSVEP) is sensitive to cognition and attention but the underlying mechanism is not well understood. This study examines stimulus evoked changes in the SSVEP phase topography and the putative role of travelling waves. Methods: Eighteen subjects viewed a central-field checkerboard and full-field flicker stimulus temporally modulated at the peak alpha rhythm frequency. EEC was recorded from 10 midline scalp sites and the bipolar SSVEP obtained from differences between adjacent electrodes. Results: The SSVEP phase comprised either progressive variations consistent with travelling waves or a phase reversal consistent with standing waves. The checkerboard pattern elicited travelling wave patterns in 14 subjects with estimated phase velocities ranging from 7 to 11 m/s after correcting for folded cortex. The flicker stimulus elicited phase reversals in 9 subjects, suggesting standing waves. Six subjects demonstrated a phase topographyspecific to the stimulus with travelling wave patterns associated with thecheckerboard and standing wave patterns associated with the flicker. Conclusions: These differences suggest the emergence of travelling and standing waves under different spatial configurations of visual input to the cortex and that wave phenomena contribute to the spatiotemporal dynamics of the SSVEP. (C) 2000 Elsevier Science ireland Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 06:30:36