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The luminance dependence of spatial vision in the cat

, : The luminance dependence of spatial vision in the cat. Vision Research 21(9): 1333-1340

The spatial contrast sensitivity and spatial resolution of 3 cats and 1 human observer were measured behaviorally over a 6 log unit range of luminances. At the highest luminance tested (16 cd/m2), cats showed lower peak contrast sensitivity than humans, and their sensitivity function was located at lower spatial frequencies. As luminance was reduced, the contrast sensitivity of both humans and cats declined while both peak sensitivity and the limit of resolution shifted toward lower frequencies. These changes were more pronounced in humans and resulted in a convergence of both contrast sensitivity and spatial resolution of the 2 species at the lowest luminance tested. The dissimilarities in the luminance dependence of spatial vision in cats and humans appear to be due to differences in both photoreceptor distribution and receptor-ganglion cell convergence.

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Accession: 006712371

PMID: 7314518

DOI: 10.1016/0042-6989(81)90240-6

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