EEG coherence analysis to study cognition: The effect of the Wisconsin card sorting test in healthy subjects

Author(s): Vo, T. M. D., Lamer, R., Chaput, Y.

Journal/Book: Brain Cognition. 1996; 30: 525B Street, Suite 1900, San Diego, CA 92101-4495. Academic Press Inc Jnl-Comp Subscriptions. 405-408.

Abstract: EEG coherence analysis can provide a valuable method to determine the involvement of brain regions during cognitive activation by computation of regional and interregional coherence changes. Coherence is a correlation coefficient between the signals recorded by two EEG scalp electrodes. EEGs were obtained from 10 right-handed healthy males while they were performing the Wisconsin test. Nineteen electrodes were used according to the 10-20 system. Statistical probability maps show changes of coherence mainly 1- in parietal, posterior temporal, and occipital regions paired between themselves or with central electrodes; 2- in frontal regions paired between themselves, especially involving the left prefrontal F7 electrode, and paired with central and posterior regions, especially involving the right prefrontal F4 electrode; and 3- in medial temporal regions paired with prefrontal electrodes. EEG coherence analysis detects changes mainly within posterior and frontal regions, thus in regions known to be involved, respectively, in visual processing and executive functions, and between these same two regions, a possible indication of information flow along interconnecting pathways during the Wisconsin test.

Note: Article D Lacroix, Univ Montreal, Dept Psychiat, 1560 Sherbrooke E, Montreal, Pq H2L 4M1, Canada

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