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Electric Fields of the BrainThe neurophysics of EEG$
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Paul L. Nunez and Ramesh Srinivasan

Print publication date: 2006

Print ISBN-13: 9780195050387

Published to Oxford Scholarship Online: May 2009

DOI: 10.1093/acprof:oso/9780195050387.001.0001

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Spatial-Temporal Properties of EEG

Spatial-Temporal Properties of EEG

(p.432) 10 Spatial-Temporal Properties of EEG
Electric Fields of the Brain

Paul L. Nunez

Ramesh Srinivasan

Oxford University Press

This chapter applies the methods of Fourier analysis (including coherence estimates) and high resolution EEG to human alpha rhythm data. Two distinct high resolution algorithms (the New Orleans spline Laplacian and Melbourne dura imaging) are compared and are found to produce very similar estimates of cortical potential distribution. Robust differences in spatial patterns of EEG coherence are found when comparing cognitive states (mental calculation) to resting states. During states of mental calculation, coherence in theta and upper alpha bands may generally increase, while overall coherence in lower the alpha band decreases. In a binocular rivalry experiment, steady state visually evoked potentials (SSVEP) reveal increased cross-hemispheric coherence at the driving frequency when subjects perceive a single image. That is, a more integrated scalp coherence pattern is found to occur with conscious perception of the stimulus flickering at the matching frequency. Several physical aspects of EEG and SSVEP are also estimated.

Keywords:   alpha rhythm, alpha coherence, theta coherence, SSVEP, conscious perception, binocular rivalry, Laplacian, dura image

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