EEG coherence studies in the normal brain and after early-onset cortical pathologies.

Details

Serval ID
serval:BIB_2044591605F4
Type
Article: article from journal or magazin.
Publication sub-type
Review (review): journal as complete as possible of one specific subject, written based on exhaustive analyses from published work.
Collection
Publications
Institution
Title
EEG coherence studies in the normal brain and after early-onset cortical pathologies.
Journal
Brain Research. Brain Research Reviews
Author(s)
Knyazeva M.G., Innocenti G.M.
ISSN
0165-0173
Publication state
Published
Issued date
10/2001
Volume
36
Number
2-3
Pages
119-128
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't ; Review
Publication Status: ppublish
Abstract
Visual corpus callosum (CC) preferentially interconnects neurons selective for similar stimulus orientation near the representations of the vertical meridian. These properties allow studying the CC functionality with EEG coherence analysis. Iso-oriented and orthogonally-oriented gratings were presented to the two hemifields, either close to the vertical meridian or far from it. In animals with intact CC, and in man, interhemispheric coherence (ICoh) increased only with iso-oriented gratings presented near or crossing the vertical meridian. The increase was localized to occipital electrodes and was specific for the beta-gamma frequency band. Visual-stimulus induced changes in ICoh were studied in patients with early pathologies of the visual areas. From a girl with abnormal vision and severe bilateral lesion of the primary visual areas at 3 weeks, after premature birth at 30 weeks, we obtained no ICoh response until 9 years. In control children visual stimulation increased occipital ICoh at 6-7 years. From a young man having suffered similar lesions when he was 9 months older than the girl, no consistent increase in ICoh could be obtained. In a 14-year-old girl with congenital visual agnosia, no visible lesions, but with a temporal-occipital epileptic focus, ICoh responses were evoked both by iso-oriented, and by orthogonally-oriented gratings. In a young man with bilateral parieto-occipital microgyria extending into the calcarine sulcus, visual stimuli increased ICoh as in normal individuals, but the response was weaker. These cases are discussed in terms of development of CC connections and point to a variety of plastic changes in the cortical connectivity of children.
Keywords
Adolescent, Adult, Brain Injuries/pathology, Brain Injuries/physiopathology, Child, Corpus Callosum/physiology, Electroencephalography/methods, Evoked Potentials, Visual/physiology, Female, Humans, Infant, Infant, Newborn, Male, Nervous System Malformations/pathology, Nervous System Malformations/physiopathology, Vision Disorders/pathology, Vision Disorders/physiopathology, Visual Cortex/physiology, Visual Perception/physiology
Pubmed
Web of science
Create date
11/04/2008 12:20
Last modification date
20/08/2019 12:56
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