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The spread of adaptation in human foveal and parafoveal cone vision
C M Cicerone1, M M Hayhoe, D I MacLeod
1Department of Cognitive Sciences, University of California, Irvine 92717.
Abstract:
We investigated the spread of bleaching adaptation for human cone vision in the central fovea and at an eccentricity of 5 deg in the nasal retina. Cone thresholds measured after adaptation to a grating bleach were compared to those measured after a uniform bleach. We conclude that the foveal and parafoveal cone systems show excellent localization of the effects of adaptation. For areas 2.5-5 min removed from the bleach, our measurement show only small sensitivity losses amounting to between 0.10 and 0.25 log unit elevation in threshold, after taking account of optical scatter.
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