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The Journal of Neurophysiology Vol. 88 No. 3 September 2002, pp. 1363-1373
Copyright ©2002 by the American Physiological Society
1University of California, Davis California 95616; and 2Center for Neural Science, New York University, New York, New York 10003
Sceniak, Michael P.,
Michael J. Hawken, and
Robert Shapley.
Contrast-Dependent Changes in Spatial Frequency Tuning of Macaque
V1 Neurons: Effects of a Changing Receptive Field Size. J. Neurophysiol. 88: 1363-1373, 2002. Previous studies on single neurons in primary visual cortex have
reported that selectivity for orientation and spatial frequency tuning
do not change with stimulus contrast. The prevailing hypothesis is that
contrast scales the response magnitude but does not differentially affect particular stimuli. Models where responses are normalized over
contrast to maintain constant tuning for parameters such as orientation
and spatial frequency have been proposed to explain these results.
However, our results indicate that a fundamental property of receptive
field organization, spatial summation, is not contrast invariant. We
examined the spatial frequency tuning of cells that show
contrast-dependent changes in spatial summation and have found that
spatial frequency selectivity also depends on stimulus contrast. These
results indicate that contrast changes in the spatial frequency tuning
curves result from spatial reorganization of the receptive field.
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