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Cerebral Cortex Advance Access originally published online on February 9, 2005
Cerebral Cortex 2005 15(11):1690-1696; doi:10.1093/cercor/bhi045
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© The Author 2005. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oupjournals.org

Multisensory and Secondary Somatosensory Cortex in the Rat

Richard R. Menzel and Daniel S. Barth

Department of Psychology, University of Colorado at Boulder, Boulder, Colorado 80309, USA

Address correspondence to Dr Daniel S. Barth, Department of Psychology, University of Colorado, Campus Box 345, Boulder, CO 80309-0345, USA. Email: dbarth{at}psych.colorado.edu.

The function of secondary somatosensory (SII) cortex is poorly understood, but there is evidence to suggest that one of its roles may be in multisensory integration. This study used high-resolution field potential mapping coupled with laminar field potential and multiunit recording to examine the association between SII and multisensory (auditory–somatosensory) cortex in the rat. We demonstrate that while there is spatial overlap between unisensory areas of SII and multisensory regions, particularly for representations of the trunk and hind limbs, they form distinct somatotopic maps. We propose that multisensory cortex be considered functionally distinct from SII, and that SII may be more concerned with unisensory processing tasks.

Key Words: AII • auditory • barrel • polysensory • SII


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