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J Neurophysiol 90: 822-831, 2003. First published April 30, 2003; doi:10.1152/jn.00005.2003
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Local Signals From Beyond the Receptive Fields of Striate Cortical Neurons

James R. Müller1, Andrew B. Metha1, John Krauskopf2 and Peter Lennie1

1 Center for Visual Science and Department of Brain and Cognitive Sciences, University of Rochester, Rochester, 14623; 2 Center for Neural Science, New York University, New York City, New York 10003

Submitted 6 January 2003; accepted in final form 17 April 2003

We examined in anesthetized macaque how the responses of a striate cortical neuron to patterns inside the receptive field were altered by surrounding patterns outside it. The changes in a neuron's response brought about by a surround are immediate and transient: they arise with the same latency as the response to a stimulus within the receptive field (this argues for a source locally in striate cortex) and become less effective as soon as 27 ms later. Surround signals appeared to exert their influence through divisive interaction (normalization) with those arising in the receptive field. Surrounding patterns presented at orientations slightly oblique to the preferred orientation consistently deformed orientation tuning curves of complex (but not simple) cells, repelling the preferred orientation but without decreasing the discriminability of the preferred grating and ones at slightly oblique orientations. By reducing responsivity and changing the tuning of complex cells locally in stimulus space, surrounding patterns reduce the correlations among responses of neurons to a particular stimulus, thus reducing the redundancy of image representation.

Address for reprint requests: J. R Müller, Howard Hughes Medical Institute and Dept. of Neurobiology, Fairchild D209, Stanford University School of Medicine, Stanford, CA 94305-5125 (E-mail: jim{at}monkeybiz.stanford.edu).




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