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Journal of Neuroscience, Vol 15, 3821-3839, Copyright © 1995 by Society for Neuroscience
A redefinition of somatosensory areas in the lateral sulcus of macaque monkeys
L Krubitzer, J Clarey, R Tweedale, G Elston and M Calford
Department of Physiology and Pharmacology, University of Queensland, Australia.
The present investigation was designed to determine the organization of
somatosensory fields in the lateral sulcus of macaque monkeys using
standard microelectrode recording techniques. Our results provide evidence
for two complete representations of the body surface. We term these fields
the second somatosensory area (SII) and the parietal ventral area (PV)
because of their similarities in position, internal organization, and
relationship to anterior parietal fields, as described for SII and PV in
other mammals. Areas SII and PV are mirror- symmetrical representations of
the body surface, sharing a common boundary at the representations of the
digits of the hand and foot, lips, and mouth. These fields are located
adjacent to the face representations of anterior parietal fields (areas 3b,
1, and 2), and are bounded ventrally and caudally by other regions of
cortex in which neurons are responsive to somatic or multimodal
stimulation. The finding of a double representation of the body surface in
the region of cortex traditionally designated as SII may explain
conflicting descriptions of SII organization in macaque monkeys. In
addition, the present study raises some questions regarding the designation
of serial processing pathways in Old World monkeys, by suggesting that
fields may have been confused in studies demonstrating such pathways. We
propose that SII and PV are components of a common plan of organization,
and are present in many eutherian mammals.
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