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The Journal of Neuroscience, July 1, 1999, 19(13):5602-5618
Binocular Neurons in V1 of Awake Monkeys Are Selective for
Absolute, Not Relative, Disparity
B. G.
Cumming and
A. J.
Parker
University Laboratory of Physiology, Oxford, OX1 3PT, United
Kingdom
Most neurophysiological accounts of disparity selectivity in
neurons of the primary visual cortex (V1) imply that they are selective
for absolute retinal disparities. By contrast, a number of
psychophysical observations indicate that relative disparities play a
more important role in depth perception. During recordings from
disparity selective neurons in area V1 of awake behaving monkeys, we
used a disparity feedback loop (Rashbass and Westheimer, 1961) to add
controlled amounts of absolute disparity to a display containing both
absolute and relative disparities. This manipulation changed the
absolute disparity of all the visible features in the display but left
unchanged the relative disparities signalled by these features. The
addition of absolute disparities produced clear changes in the neural
responses to unchanged external stimuli, which were well predicted by
the measured change in absolute disparity: in 45/53 cases, the neuron
maintained a consistent firing pattern with respect to absolute
disparity so that the manipulation created no significant change in the
absolute disparity preferred by the neuron. No neuron in V1 maintained
a consistent relationship with relative disparity. We conclude that the
relative disparity signals used in primate depth perception are
constructed outside area V1.
Key words:
primary visual cortex; binocular disparity; stereopsis; vergence eye movements; depth perception; receptive field
Copyright © 1999 Society for Neuroscience 0270-6474/99/19135602-17$05.00/0
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