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Science 29 September 1995:
Vol. 269. no. 5232, pp. 1877 - 1880
DOI: 10.1126/science.7569930
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Articles

Science, Vol 269, Issue 5232, 1877-1880
Copyright © 1995 by American Association for the Advancement of Science

articles

Lateral interactions in primary visual cortex: a model bridging physiology and psychophysics

M Stemmler, M Usher, and E Niebur

Computation and Neural Systems Program, California Institute of Technology, Pasadena 91125, USA.

Recent physiological studies show that the spatial context of visual stimuli enhances the response of cells in primary visual cortex to weak stimuli and suppresses the response to strong stimuli. A model of orientation-tuned neurons was constructed to explore the role of lateral cortical connections in this dual effect. The differential effect of excitatory and inhibitory current and noise conveyed by the lateral connections explains the physiological results as well as the psychophysics of pop-out and contour completion. Exploiting the model's property of stochastic resonance, the visual context changes the model's intrinsic input variability to enhance the detection of weak signals.


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