Research article summary (published 30 Oct 2005):

Early visual evoked potentials in callosal agenesis.

Full Abstract

Three participants with callosal agenesis and 12 neurologically normal participants were tested on a simple reaction time task, with visual evoked potentials collected using a high-density 128-channel system. Independent-components analyses were performed on the averaged visual evoked potentials to isolate the components of interest. Contrary to previous research with acallosals, evidence of ipsilateral activation was present in all 3 participants. Although ipsilateral visual components were present in all 4 unilateral conditions in the 2 related acallosal participants, in the 3rd, these were present only in the crossed visual field-hand conditions and not in the uncrossed conditions. Suggestions are made as to why these results differ from earlier findings and as to the neural mechanisms facilitating this ipsilateral activation. Copyright (c) 2005 APA, all rights reserved.

Author information

Author/s: Barr, Melodie S (MS); Hamm, Jeff P (JP); Kirk, Ian J (IJ); Corballis, Michael C (MC);

Affiliation: Research Centre for Cognitive Neuroscience, Department of Psychology, University of Auckland, Auckland, New Zealand.

Journal and publication information

Publication Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't

Journal: Neuropsychology (Neuropsychology), published in United States. (Language: eng)

Reference: 2005-Nov; vol 19 (issue 6) : pp 707-27

Dates: Created 2005/12/14; Completed 2006/03/30; Revised 2006/11/15;

PMID: 16351347, status: MEDLINE (last retrieval date: 2/18/2009, IMS Date: )

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Adult Brain Diseases - pathology; physiopathology Brain Mapping - methods Corpus Callosum - abnormalities; physiopathology Electroencephalography - methods Evoked Potentials, Visual - physiology Female Functional Laterality - physiology

Humans Male Middle Aged Models, Statistical Photic Stimulation - methods Psychomotor Performance - physiology Reaction Time - physiology Time Factors

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