Decreased Interhemispheric EEG Coherence during Sleep in Agenesis of the Corpus Callosum

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Abstract

Inter- and intrahemispheric EEG coherence was studied in 4 subjects with agenesis of the corpus callosum (ACC) and in 4 matched controls through different states of the sleep/wakefulness cycle. Interhemispheric coherence was calculated between homologous prefrontal, frontal, central, parietal and occipital electrode pairs whereas intrahemispheric coherence was calculated between all adjacent, unihemispheric electrode pairs. EEG samples were recorded from stage 2, stages 3 + 4 and stage REM sleep and the eyes closed waking state. Interhemispheric coherence measures indicated lower values for ACC subjects than for control subjects for most brain regions; the occipital cortex was least affected. These results further validate the interhemispheric coherence function as a measure of activity in the corpus callosum and suggest that occipital measures may index activity localized in the posterior commissure. Intrahemispheric coherence measures indicated very few differences between the two groups, a result consistent with the suggestion that there is no specialized intrahemispheric compensation in ACC.

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Journal

Journal ID (publisher-id): ENE

Journal ID (nlm-ta): Eur Neurol

Journal ID (doi): 10.1159/issn.0014-3022

Title: European Neurology

Publisher: S. Karger AG

ISSN (Print): 0014-3022

ISSN (Electronic): 1421-9913

Publication date Subscription-year: 1993

Publication date (Print): 1993

Publication date (Electronic): 12 February 2008

Volume: 33

Issue: 2

Pages: 173-176

Affiliations

^aCentre d’Etude du Sommeil, Hôpital du Sacré-Cœur et Département de Psychiatrie, Université de Montréal; ^bGroupe de Recherche en Neuropsychologic Expérimental, Département de Psychologie, Université de Montréal, Montréal, Que., Canada

Article

Publisher ID: 116928 Other ID: Eur Neurol 1993;33:173–176

DOI: 10.1159/000116928

PubMed ID: 8467828

SO-VID: 1afc060d-24db-4d71-9333-7621c03ff60f

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Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher. Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug. Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.

History

Date received : 10 March 1992

Date accepted : 19 May 1992

Page count

Pages: 4

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