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.
journal_name
Psychophysiologyjournal_title
Psychophysiologyauthors
Steger J,Imhof K,Denoth J,Pascual-Marqui RD,Steinhausen HC,Brandeis Dsubject
Has Abstractpub_date
2001-03-01 00:00:00pages
243-53issue
2eissn
0048-5772issn
1540-5958journal_volume
38pub_type
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