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| Research article summary (published 30 Dec 2002): |
The regularities of the discrete nature of multi-variability of EEG spectral patterns.
Full Abstract
The short-term structure of electroencephalogram (EEG) spectral transformations during different brain functional states (closed/opened eyes and memory task) was studied. It was shown that approximately 50% of spectral pattern (SP) types occur not more than 2-3 times per 149 analysis epochs in a 1-min EEG. The remaining 50% of SP types were the same for the different EEG channels, in all subjects and various brain functional states. Additionally, a high incidence of the neighboring SP types in strongly overlapping (by 80%) 2-s analysis epochs of the EEG was shown. The SP identified in a given epoch has only a limited predictive value on the SPs identified in the subsequent epochs. The incidence effect was restricted by the limited SP set and by a 50% reduction in the functionally active SPs, which resulted in a temporary stabilization of SPs in sequential combinations. The parameters of temporary stabilization of SPs were significantly different from 'random' EEG which provides evidence of the non-occasional character of stabilization of the main dynamic parameters of neuronal activity. Thus, the findings suggest that the multi-variability of neuronal nets is discrete in time, and limited by the dynamics of the short quasi-stable brain states.
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Author information
Author/s: Fingelkurts, Alexander A (AA); Fingelkurts, Andrew A (AA); Kaplan, Alexander Ya (AY);
Affiliation: Research Group of Cognitive Science and Technology, Laboratory of Computational Engineering, Helsinki University of Technology P.O. Box 9400, Helsinki 02015 HUT, Finland. fintw@hotmail.com
Journal and publication information
Publication Type: Comparative Study; Journal Article
Journal: International journal of psychophysiology : official journal of the International Organization of Psychophysiology (Int J Psychophysiol), published in Netherlands. (Language: eng)
Reference: 2003-Jan; vol 47 (issue 1) : pp 23-41
Dates: Created 2003/01/24; Completed 2003/07/11; Revised 2006/11/15;
PMID: 12543444, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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