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Previous Article | Next Article
Volume 17, Number 21, Issue of November 1, 1997 pp. 8621-8644
Copyright ©1997 Society for NeuroscienceLinearity and Normalization in Simple Cells of the Macaque Primary Visual Cortex
Received May 29, 1997; revised Aug. 20, 1997; accepted Aug. 22, 1997.
Matteo Carandini1, David J. Heeger2, and J. Anthony Movshon1 1 Howard Hughes Medical Institute and Center for Neural Science, New York University, New York, New York 10003, and 2 Department of Psychology, Stanford University, Stanford, California 94305
Simple cells in the primary visual cortex often appear to compute a weighted sum of the light intensity distribution of the visual stimuli that fall on their receptive fields. A linear model of these cells has the advantage of simplicity and captures a number of basic aspects of cell function. It, however, fails to account for important response nonlinearities, such as the decrease in response gain and latency observed at high contrasts and the effects of masking by stimuli that fail to elicit responses when presented alone. To account for these nonlinearities we have proposed a normalization model, which extends the linear model to include mutual shunting inhibition among a large number of cortical cells. Shunting inhibition is divisive, and its effect in the model is to normalize the linear responses by a measure of stimulus energy. To test this model we performed extracellular recordings of simple cells in the primary visual cortex of anesthetized macaques. We presented large stimulus sets consisting of (1) drifting gratings of various orientations and spatiotemporal frequencies; (2) plaids composed of two drifting gratings; and (3) gratings masked by full-screen spatiotemporal white noise. We derived expressions for the model predictions and fitted them to the physiological data. Our results support the normalization model, which accounts for both the linear and the nonlinear properties of the cells. An alternative model, in which the linear responses are subject to a compressive nonlinearity, did not perform nearly as well.
Key words: visual cortex; contrast; nonlinearity; gain control; normalization; masking; noise
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