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Brain mapping of bilateral visual interactions in children

Published online by Cambridge University Press:  02 March 2001

JUERG STEGER ,
KATRIN IMHOF ,
JACHEN DENOTH ,
ROBERTO DOMINGO PASCUAL-MARQUI ,
HANS-CHRISTOPH STEINHAUSEN  and
DANIEL BRANDEIS
JUERG STEGER
Affiliation:
Department of Child and Adolescent Psychiatry, University of Zurich, Switzerland Laboratory for Biomechanics, Eidgenössische Technische Hochschule (ETH), Zurich, Switzerland
KATRIN IMHOF
Affiliation:
Department of Child and Adolescent Psychiatry, University of Zurich, Switzerland
JACHEN DENOTH
Affiliation:
Laboratory for Biomechanics, Eidgenössische Technische Hochschule (ETH), Zurich, Switzerland
ROBERTO DOMINGO PASCUAL-MARQUI
Affiliation:
The KEY Institute, University Hospital of Psychiatry, Zurich, Switzerland
HANS-CHRISTOPH STEINHAUSEN
Affiliation:
Department of Child and Adolescent Psychiatry, University of Zurich, Switzerland
DANIEL BRANDEIS
Affiliation:
Department of Child and Adolescent Psychiatry, University of Zurich, Switzerland
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Abstract

Interhemispheric interactions were studied with functional brain mapping of visual processing. Children performed a reaction time task with uni- and bilateral targets and nontargets. The visual evoked potential (VEP) was segmented into P1a, P1b, and N1 microstates using map rather than channel features. Map latencies, amplitudes and sources were tested for bilateral interactions. Bilateral targets yielded shorter VEP map latencies but later response onsets than unilateral ones. Source analyses of the unilateral VEPs indicated a transition from contra- (P1a) to ipsilateral (P1b) visual cortex activation (interhemispheric transfer). Bilateral VEPs were smaller than the summed unilateral VEPs in all microstates, indicating that interhemispheric interactions both precede and follow interhemispheric transfer. Brain mapping of uni- and bilateral VEPs in children thus revealed several distinct forms of interhemispheric interactions in the same, early time range.

Keywords

Visual evoked potentialsBilateral interactionsInterhemispheric transferSource localizationChildren
Type
Research Article
Information
Psychophysiology , Volume 38 , Issue 2 , March 2001 , pp. 243 - 253
Copyright
2001 Society for Psychophysiological Research

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