Journal
CEREBRAL CORTEX
Volume 22, Issue 8, Pages 1834-1850Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/cercor/bhr257
Keywords
area 2; area 5; medial intraparietal cortex; posterior parietal cortex; primates
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Funding
- National Institute of Neurological Disorders and Stroke [R01NS035103-13A1]
- National Institutes of Health [T32 DC8072, F32NS064792, F32EY014503]
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Brodmann's area 5 has traditionally included the rostral bank of the intraparietal sulcus (IPS) as well as posterior portions of the postcentral gyrus and medial wall. However, different portions of this large architectonic zone may serve different functions related to reaching and grasping behaviors. The current study used multiunit recording techniques in anesthetized macaque monkeys to survey a large extent of the rostral bank of the IPS so that hundreds of recording sites could be used to determine the functional subdivisions and topographic organization of cortical areas in this region. We identified a lateral area on the rostra! IPS that we term area 5L. Area 5L contains neurons with receptive fields on mostly the shoulder, forelimb, and digits, with no apparent representation of other body parts. Thus, there is a large magnification of the forelimb. Receptive fields for neurons in this region often contain multiple joints of the forelimb or multiple digits, which results in imprecise topography or fractures in map organization. Our results provide the first overall topographic map of area 51 obtained in individual macaque monkeys and suggest that this region is distinct from more medial portions of the IPS.
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