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| Research article summary (published 30 Mar 2002): |
EEG coherence in attention-deficit/hyperactivity disorder: a comparative study of two DSM-IV types.
Full Abstract
OBJECTIVES:
This study investigated differences in intrahemispheric and interhemispheric electroencephalographic (EEG) coherences between attention-deficit/hyperactivity disorder (ADHD) and control children, and between children with the Combined (ADHDcom) and Inattentive (ADHDin) types of ADHD.
METHODS:
Three age- and sex-matched groups of 40 children, aged 8-12 years, diagnosed with ADHDcom, ADHDin, and normal control children, participated in this study. EEG was recorded from 21 sites during an eyes-closed resting condition and Fourier transformed. Wave-shape coherence was calculated for 8 intrahemispheric electrode pairs (4 in each hemisphere), and 8 interhemispheric electrode pairs, within each of the delta, theta, alpha and beta bands.
RESULTS:
At shorter inter-electrode distances, ADHD children had elevated intrahemispheric coherences in the theta band and reduced lateral differences in the theta and alpha bands. At longer inter-electrode distances, ADHD children had lower intrahemispheric alpha coherences than controls. Frontally, ADHD children had interhemispheric coherences elevated in the delta and theta bands, and reduced in the alpha band. An alpha coherence reduction in temporal regions, and a theta coherence enhancement in central/parietal/occipital regions, were also apparent. ADHDcom had greater intrahemispheric theta and beta coherences than ADHDin. Frontally, ADHDcom had higher levels of interhemispheric coherences than ADHDin for the delta and theta bands. In central/parietal/occipital regions, beta coherences were elevated in ADHDcom.
CONCLUSIONS:
EEG coherences suggest reduced cortical differentiation and specialisation in ADHD, particularly in cortico-cortical circuits involving theta activity. Generally, ADHDcom children displayed greater anomalies than ADHDin children.
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Author information
Author/s: Barry, Robert J (RJ); Clarke, Adam R (AR); McCarthy, Rory (R); Selikowitz, Mark (M);
Affiliation: Brain & Behaviour Research Institute and Department of Psychology, University of Wollongong, 2522, Wollongong, Australia. robert_barry(-atsign-)uow.edu.au
Journal and publication information
Publication Type: Comparative Study; Journal Article
Journal: Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology (Clin Neurophysiol), published in Netherlands. (Language: eng)
Reference: 2002-Apr; vol 113 (issue 4) : pp 579-85
Dates: Created 2002/04/16; Completed 2002/06/24; Revised 2008/09/10;
PMID: 11956003, 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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