Abstract

By sinusoidally flickering appropriate spatial patterns, the properties of a transient mechanism in the human visual system can be isolated. The data indicate that the spatiotemporal response of this mechanism may be decomposed into the product of separate spatial and temporal functions. The spatial line spread function has a broad summation region flanked by weak inhibitory regions and is in good agreement with the properties of the U-mechanism hypothesized by Wilson and Bergen (1979). The flicker sensitivity function displays a pronounced low frequency falloff indicative of strong temporal inhibition. Finally, it is shown that the visual system behaves like a single channel at low spatial and high temporal frequencies.

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