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The Journal of Neuroscience, May 1, 2000, 20(9):3387-3400
The Precision of Single Neuron Responses in Cortical Area V1
during Stereoscopic Depth Judgments
Simon J. D.
Prince,
Andrew D.
Pointon,
Bruce G.
Cumming, and
Andrew J.
Parker
University Laboratory of Physiology, Oxford, United Kingdom, OX1
3PT
The performance of single neurons in cortical area V1 of alert
macaque monkeys was compared against the animals' psychophysical performance during a binocular disparity discrimination task. Performance was assessed with stimuli that consisted of a patch of
dynamic random dots, whose disparity varied from trial to trial, surrounded by an annulus of similar dots at a fixed disparity. On each
trial, the animals indicated whether the depth of the central patch was
in front of or behind the annulus. For each disparity of the center
patch, neural performance was assessed by calculating the probability
that the response of the neuron was greater or less than the
response when the center disparity was the same as that of the annulus.
Initially the animals performed the task simultaneously with the neural
recording. However, the range of disparities used, which was
appropriate for the neuronal recording, may have affected performance,
because the thresholds were substantially lower (2.6×) when the
psychophysical measurements were repeated later. Average neuronal
thresholds were ~4× poorer than these behavioral thresholds,
although the best neurons were marginally better than the animals'
behavior. Thus, the well known precision of relative depth judgments
can be supported with signals from a small number of V1 neurons.
Interference with the relative depth information in the stimulus
profoundly affected behavioral thresholds, which were ~10× poorer
when the surround was absent or contained binocularly uncorrelated
dots. In this case, single V1 neurons consistently outperform the
observer: presumably here, psychophysical thresholds are limited by
other factors (such as uncertainty about vergence eye position).
Key words:
stereoacuity; binocular disparity; neurometric threshold; cortical area V1; awake macaque; electrophysiology
Copyright © 2000 Society for Neuroscience 0270-6474/00/2093387-14$05.00/0
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