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The Journal of Neuroscience, June 15, 2000, 20(12):4758-4767
Local Disparity Not Perceived Depth Is Signaled by Binocular
Neurons in Cortical Area V1 of the Macaque
Bruce G.
Cumming and
Andrew J.
Parker
University Laboratory of Physiology, Oxford, United Kingdom OX1 3PT
Binocular neurons that are closely related to depth perception
should respond selectively for stimuli eliciting an appropriate depth
sensation. To separate perceived depth from local disparity within the
receptive field, sinusoidal luminance gratings were presented within a
circular aperture. The disparity of the aperture was coupled to that of
the grating, thereby rendering unambiguous the psychophysical matching
between repeating cycles of the grating. In cases in which the stimulus
disparity differs by one horizontal period of the grating, the portion
of the grating that locally covers a receptive field is binocularly
identical, but the depth sensation is very different because of the
aperture. For 117 disparity-selective V1 neurons tested in two monkeys,
the overwhelming majority responded equally well to configurations that
were locally identical but led to different perceptions of depth.
Because the psychophysical sensation is not reflected in the firing
rate of V1 neurons, the signals that make stereo matches explicit are
most likely elaborated in extrastriate cortex.
Key words:
primary visual cortex; binocular disparity; stereopsis; correspondence problem; depth perception; behaving monkey
Copyright © 2000 Society for Neuroscience 0270-6474/00/20124758-10$05.00/0
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