The effect of contrast on the non-linear response of the Y cell

Robert Shapley, J. D. Victor

Research output: Contribution to journalArticle

Abstract

Second-order frequency responses were obtained from cat retinal ganglion cells of the Y type. The cells were stimulated by a spatial sine grating whose contrast was modulated in time by a sum of 8 sinusoids. Second-order frequency responses obtained at higher contrasts have a peak amplitude at higher input temporal frequency, and phase shifts, compared to their low-contrast counterparts. This change in shape of the second-order frequency response is a departure from the prediction of the linear/static non-linear/linear sandwich model of the non-linear pathway in the cat retina. The departure is analysed by means of the hypothesis that the 2 filters of the sandwich model are parametric in contrast. Most of the change in shape of the second-order frequency response with contrast is accounted for in terms of the sandwich model by changes in the transfer characteristics of the filter preceding the static non-linearity. The effect of contrast on the second-order responses of Y cells is qualitatively similar in several ways to the effect of contrast on first-order responses. This suggests that the contrast gain control mechanism acts early in the retina, before linear and non-linear pathways have diverged.

Original languageEnglish (US)
Pages (from-to)535-547
Number of pages13
JournalJournal of Physiology
VolumeVOL.302
StatePublished - 1980

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Retina
Cats
Nonlinear Dynamics
Retinal Ganglion Cells
Linear Models

ASJC Scopus subject areas

  • Physiology

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The effect of contrast on the non-linear response of the Y cell. / Shapley, Robert; Victor, J. D.

In: Journal of Physiology, Vol. VOL.302, 1980, p. 535-547.

Research output: Contribution to journalArticle

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