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Journal of Neuroscience, Vol 7, 1056-1063, Copyright © 1987 by Society for Neuroscience

ARTICLE

Background and bleaching equivalence in steady-state adaptation of vertebrate rods

KN Leibovic, JE Dowling and YY Kim

We have investigated background and bleaching adaptation in vertebrate rods by intracellular recording in the retina of Bufo marinus. Backgrounds and bleaching produce adaptation in photoreceptors and lead to a shift and a compression of the response operating range. Threshold elevation due to backgrounds follows the Rose-DeVries rule at low intensities and the Weber-Fechner rule at high intensities. Threshold elevation due to bleaching is linear almost up to 17% bleached pigment and exponential thereafter. An equivalence can be established between bleaching and backgrounds with respect to threshold elevation, on the one hand, and with respect to response compression, on the other. These equivalences are the same within experimental error. The equivalence, moreover, appears to extend to the complete response curve. These results have implications for psychophysics as well as for photoreceptor transduction.


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G. L. Fain, H. R. Matthews, M. C. Cornwall, and Y. Koutalos
Adaptation in Vertebrate Photoreceptors
Physiol Rev, January 1, 2001; 81(1): 117 - 151.
[Abstract] [Full Text] [PDF]


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