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J Neurophysiol (April 2, 2003). doi:10.1152/jn.01179.2002
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Submitted on December 31, 2002
Accepted on March 18, 2003

Functional architecture of eye position gain fields in visual association cortex of behaving monkey

Ralph M Siegel1*, Milena Raffi1, Raymond E Phinney1, Jessica A Turner1, and Gabor Jando1

1 Center for Molecular and Behavioral Neuroscience, Rutgers University, Newark, NJ, USA

* To whom correspondence should be addressed. E-mail: axon{at}cortex.rutgers.edu.

In the behaving monkey, inferior parietal lobe cortical neurons combine visual information with eye position signals. However, an organized topographic map of these neurons' properties has never been demonstrated. Intrinsic optical imaging revealed a functional architecture for the effect of eye position upon the visual response to radial optic flow. The map was distributed across two sub-divisions of the inferior parietal lobule, area 7a and the dorsal prelunate area, DP. Area 7a contains a representation of the lower eye position gain fields while area DP represents the upper eye position gain fields. Horizontal eye position is represented orthogonal to the vertical eye position across the medial lateral extents of the cortices. Similar topographies were found in three hemispheres of two monkeys; the horizontal and vertical gain field representations were not isotropic with a greater modulation found with the vertical. Monte Carlo methods demonstrated the significance of the maps and they were verified in part using multiunit recordings. The novel topographic organization of this association cortex area provides a substrate for constructing representations of surrounding space for perception and the guidance of motor behaviors.




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