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Journal of Neuroscience, Vol 12, 2478-2492, Copyright © 1992 by Society for Neuroscience
Disparity sensitivity of neurons in monkey extrastriate area MST
JP Roy, H Komatsu and RH Wurtz
Laboratory of Sensorimotor Research, National Eye Institute, Bethesda, Maryland 20892.
We tested the disparity sensitivity of neurons from the medial superior
temporal area (MST) in awake behaving monkeys. While the monkey looked at a
fixation spot on a screen in front of it, random dot stimuli moved in the
preferred direction of the cell under study, and the disparity of the dots
made the stimuli appear to move in a frontoparallel plane in front of, on,
or behind the screen. Over 90% of the 272 neurons studied were sensitive to
the disparity of the visual stimulus. Of those disparity-sensitive cells,
95% were most responsive either to near stimuli (stimuli with crossed
disparities appearing to move in front of the screen) or to far stimuli
(stimuli with uncrossed disparities appearing to move behind the screen).
In a smaller sample of the disparity-sensitive cells, we found cells whose
preferred direction of stimulus motion reversed as the disparity of the
stimulus reversed. For example, a cell that responded best to rightward
motion for near stimuli responded best to leftward motion for far stimuli.
We found that 40% of the disparity-sensitive cells had this disparity-
dependent direction selectivity. This disparity-dependent direction
selectivity was maintained over the entire range of speeds tested (6-56
degrees/sec). We tested whether the disparity sensitivity of the neurons
indicated the distance of the stimulus from the screen where the monkey was
fixating (relative depth) or the distance of the stimulus from the monkey
(absolute depth) by having the monkey fixate at different depths in front
of or behind the screen. For most MST neurons, the changes in vergence did
not alter the disparity response, indicating that the disparity sensitivity
of these neurons conveyed information on depth relative to the plane of
fixation. We conclude that the disparity characteristics of cells in the
dorsomedial MST are those expected of a system serving primarily coarse
rather than fine stereopsis. The correlation between disparity selectivity
and direction selectivity in these neurons, as well as their other
properties, suggests a role in signaling the direction of self-motion of
the observer through the environment.
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