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| Research article summary (published 29 Sep 2002): |
Variability of EEG synchronization during a working memory task in healthy subjects.
Full Abstract
Working memory is associated with an increase in EEG theta synchronization and a decrease in lower alpha band synchronization. We investigated whether such changes in mean synchronization level are accompanied by changes in small scale fluctuations of synchronization. EEGs (19 channels; average reference; sample frequency 250 Hz) were recorded in 21 healthy subjects (12 males; mean age 62.5 years; S.D. 2.1) at rest and during a visual working memory condition. EEG synchronization was computed in six frequency bands (2-6; 6-10; 10-14; 14-18; 18-22; 22-50 Hz) using the synchronization likelihood. Variability of the synchronization was quantified with synchronization entropy. During the working memory condition synchronization increased in the 2-6 Hz band, and decreased in the 6-10, 14-18 and 18-22 Hz bands. Working memory was associated with increased variability in the 2-6 Hz band, and decreased variability in the 6-10 Hz band and, to a lesser extent, in the 14-18 and 18-22 Hz bands. Working memory is accompanied not only by characteristic changes in the mean level of interactions between neural networks, but also by changes in small scale fluctuations in such interactions. Strong, but rapidly fluctuating coupling between neural systems might provide a mechanism to optimize the balance between local differentiation and global integration of brain activity.Copyright 2002 Elsevier Science B.V.
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Author information
Author/s: Stam, Cornelis J (CJ); van Cappellen van Walsum, Anne-Marie (AM); Micheloyannis, Sifis (S);
Affiliation: Department of Clinical Neurophysiology, VU University Medical Centre, Amsterdam, The Netherlands. cj.stam(-atsign-)vumc.nl
Journal and publication information
Publication Type: Clinical Trial; Journal Article
Journal: International journal of psychophysiology : official journal of the International Organization of Psychophysiology (Int J Psychophysiol), published in Netherlands. (Language: eng)
Reference: 2002-Oct; vol 46 (issue 1) : pp 53-66
Dates: Created 2002/10/10; Completed 2002/11/05; Revised 2004/11/17;
PMID: 12374646, 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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