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The Journal of Neurophysiology Vol. 87 No. 1 January 2002, pp. 273-285
Copyright ©2002 by the American Physiological Society
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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