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J Neurophysiol 87: 273-285, 2002;
0022-3077/02 $5.00
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The Journal of Neurophysiology Vol. 87 No. 1 January 2002, pp. 273-285
Copyright ©2002 by the American Physiological Society

Response of MSTd Neurons to Simulated 3D Orientation of Rotating Planes

Hiroki Sugihara,1,2 Ikuya Murakami,1 Krishna V. Shenoy,3 Richard A. Andersen,3 and Hidehiko Komatsu1,2

 1Laboratory of Neural Control, National Institute for Physiological Sciences;  2Department of Physiological Sciences, The Graduate University for Advanced Studies, Aichi 444-8585, Japan; and  3Division of Biology, California Institute of Technology, Pasadena, California 91125

Sugihara, Hiroki, Ikuya Murakami, Krishna V. Shenoy, Richard A. Andersen, and Hidehiko Komatsu. Response of MSTd Neurons to Simulated 3D Orientation of Rotating Planes. J. Neurophysiol. 87: 273-285, 2002. We studied whether the dorsal division of the medial superior temporal area (MSTd) in the macaque has activity related to structure-from-motion (SFM) processing. As the simplest form of three-dimensional (3D) structure, we chose a planar stimulus and examined the relation between the neural responses and the simulated 3D orientation of the plane defined by motion cues. We recorded from 114 MSTd neurons while monkeys were performing a visual fixation task. These neurons responded to a basic set of optic flow patterns such as translation, expansion/contraction, and rotation. Reponses of these neurons to rotating plane stimuli were examined to see whether the MSTd neurons exhibited selectivity to the tilt and slant that characterize the 3D orientation of the plane. We found that most MSTd neurons tested (97 of 114) responded to the plane stimuli, and many neurons (65 of 97) exhibited selectivity to tilt and/or slant. Of 97 neurons, 18% (17/97) were selective only to tilt, 24% (23/97) only to slant, and 26% (25/97) to both. Control experiments rejected the possibility that the selectivity could be explained solely by the sensitivity to local stimulus components such as local translation, local speed, and local speed gradients. These results suggest that MSTd neurons are sensitive to stimulus features specific to the perceived 3D orientation of the rotating plane stimuli and suggest that area MSTd is involved in SFM processing.




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