Interhemispheric Transfer of Visual Information in the Absence of the Corpus Callosum

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dc.contributor.advisor Corballis, Michael C. en Forster, Bettina Alexandra en 2007-07-11T22:35:28Z en 2007-07-11T22:35:28Z en 1998 en
dc.identifier THESIS 98-317 en
dc.identifier.citation Thesis (PhD--Psychology)--University of Auckland, 1998 en
dc.identifier.uri en
dc.description Full text is available to authenticated members of The University of Auckland only. en
dc.description.abstract This thesis examines the nature of subcortical processes in vision, as manifest in subjects lacking the major forebrain commissure, the corpus callosum. One subject (L.B.) with full forebrain commissurotomy, one (R.B.) with callosal agenesis, as well as normal confiols were tested in two sets of experiments: one on the effects of luminance and equiluminance on interhemispheric transfer time, the second on the amount of information that can be transferred subcortically in increasingly complex tasks. The stimuli were presented in each visual field, and subjects responded with one or the other hand. Reaction times (RT) for uncrossed conditions where the responding hand is ipsilateral to the visual field of stimulus presentation were subtracted from crossed conditions where the responding hand is contralateral to the visual field of stimulus presentation. This difference between crossed and uncrossed RTs (CUD) was taken as a measure for interhemispheric transfer time. R.B.'s CUD generally fell in between the CUD of the normal controls and L.B.. In the first set of experiments stimuli comprised circular disks which either varied in luminance against a black background or formed a grey circle on an equiluminant yellow background. Overall, simple RTs increased as the luminance of the stimuli relative to the background decreased, but the CUD was not systematically affected. It remained largely unaffected under equiluminance, suggesting that cortical processing takes place before interhemispheric transfer. The results support previous evidence that interhemispheric transfer, even in the split-brain, depends on visually insensitive pathways. en
dc.language.iso en en
dc.publisher ResearchSpace@Auckland en
dc.relation.ispartof PhD Thesis - University of Auckland en
dc.relation.isreferencedby UoA9984345214002091 en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. en
dc.rights Restricted Item. Available to authenticated members of The University of Auckland. en
dc.rights.uri en
dc.title Interhemispheric Transfer of Visual Information in the Absence of the Corpus Callosum en
dc.type Thesis en Psychology en The University of Auckland en Doctoral en PhD en
dc.rights.holder Copyright: The author en

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