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Journal of Neuroscience, Vol 15, 5192-5208, Copyright © 1995 by Society for Neuroscience
Response of monkey MST neurons to optic flow stimuli with shifted centers of motion
CJ Duffy and RH Wurtz
Laboratory of Sensorimotor Research, National Eye Institute, Bethesda, Maryland 20892, USA.
Neurons in the dorsal region of the medial superior temporal area (MSTd)
have previously been shown to respond to the expanding radial motion that
occurs as an observer moves through the environment. In previous
experiments, MSTd neurons were tested with radial and circular motion
centered in the visual field. However, different directions of observer
motion, relative to the direction of gaze, are accompanied by visual motion
centered at different locations in the visual field. The present
experiments investigated whether neurons that respond to radial and
circular motion might respond differently when the center of motion was
shifted to different regions of the visual field. About 90% of the 245
neurons studied responded differently when the center of motion was shifted
away from the center of the field. The centers of motion preferred by each
neuron were limited to one area of the visual field. All parts of the
visual field were represented in the sample, with greater numbers of
neurons preferring centers of motion closer to the center of the field. We
hypothesize that each of the MSTd neurons has a center of motion field with
a gradient of preferred centers of motion, and that there is an orderly
arrangement of MSTd neurons with each region of the visual field being
represented by a set of neurons. This arrangement creates the potential for
graded responses from individual neurons for different directions of
heading as an observer moves through the environment.
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