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CenterSurround Antagonism Based on Disparity in Primate Area MT

Summary: Center­Surround Antagonism Based on Disparity in
Primate Area MT
David C. Bradley and Richard A. Andersen
Biology Division, California Institute of Technology, Pasadena, California 91225
Most neurons in primate visual area MT have a large, modula-
tory region surrounding their classically defined receptive field,
or center. The velocity tuning of this "surround" is generally
antagonistic to the center, making it potentially useful for de-
tecting image discontinuities on the basis of differential motion.
Because classical MT receptive fields are also disparity-
selective, one might expect to find disparity-based surround
antagonism as well; this would provide additional information
about image discontinuities. However, the effects of disparity in
the MT surround have not been studied previously. We mea-
sured single-neuron responses to variable-disparity moving
patterns in the MT surround while holding a central moving
pattern at a fixed disparity. Of the 130 neurons tested, 84%
exhibited a modulatory surround, and in 52% of these, re-
sponses were significantly affected by disparity in the surround.
In most cases, disparity effects in the surround were antago-


Source: Andersen, Richard - Division of Biology, California Institute of Technology


Collections: Biology and Medicine