Title
On the dependence of independent group EEG sources: an EEG study on two large databases On the dependence of independent group EEG sources: an EEG study on two large databases
Author
Faculty/Department
Faculty of Medicine and Health Sciences
Publication type
article
Publication
New York, NY ,
Subject
Human medicine
Source (journal)
Brain topography : journal of functional neurophysiology. - New York, NY
Volume/pages
23(2010) :2 , p. 134-138
ISSN
0896-0267
ISI
000277935900004
Carrier
E
Target language
Dutch (dut)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The aim of this work is to study the coherence profile (dependence) of robust eyes-closed resting EEG sources isolated by group blind source separation (gBSS). We employ a testretest strategy using two large sample normative databases (N = 57 and 84). Using a BSS method in the complex Fourier domain, we show that we can rigourously study the out-of-phase dependence of the extracted components, albeit they are extracted so as to be in-phase independent (by BSS definition). Our focus on lagged communication between components effectively yields dependence measures unbiased by volume conduction effects, which is a major concern about the validity of any dependence measures issued by EEG measurements. We are able to show the organization of the extracted components in two networks. Within each network components oscillate coherently with multiple-frequency dynamics, whereas between networks they exchange information at non-random multiple time-lag rates.
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