Chapter

Spatial-Temporal Properties of EEG

Paul L. Nunez and Ramesh Srinivasan

in Electric Fields of the Brain

Second edition

Published in print January 2006 | ISBN: 9780195050387
Published online May 2009 | e-ISBN: 9780199865673 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780195050387.003.0010
 Spatial-Temporal Properties of EEG

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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

Chapter.  19399 words.  Illustrated.

Subjects: Neuroscience

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