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Neuropsychology. 2004 Apr;18(2):328-39.

Neural gate keeping: the role of interhemispheric interactions in resource allocation and selective filtering.

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1
Department of Psychology, University of Michigan, Ann Arbor, MI 48109-1109, USA.

Abstract

The corpus callosum has been proposed to contribute to attention by modulating resource allocation between the hemispheres and filtering interhemispheric signal transmission (M. T. Banich, 1998). The resource allocation hypothesis predicts that interhemispheric interactions become more advantageous with increasing resource demands. The selective filtering hypothesis predicts that interhemispheric interactions become less advantageous as filtering requirements increase. The authors tested both predictions by comparing within- and across-hemisphere letter matching under dual-task (Experiment 1) and selective attention conditions (Experiment 2). Task-specific resource demands (i.e., letter processing load) alter the bihemispheric advantage, but the general demand imposed by an unrelated secondary task does not. Filtering requirements influenced the advantage from interhemispheric interactions, providing new evidence for the role of the corpus callosum in selective attention.

PMID:
15099155
DOI:
10.1037/0894-4105.18.2.328
[Indexed for MEDLINE]
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