PMID: 490230Jul 1, 1979Paper

Using color substitution pupil response to expose chromatic mechanisms

Journal of the Optical Society of America
V D Saini, G H Cohen

Abstract

It is well known that pupillary threshold shows a scotopic spectral behavior, even for foveal stimuli. However, when two scotopically balanced fields at different wavelengths are alternated, the pupil shows a constriction response at each transition, exposing innervation from chromatic mechanisms. Using a suitable model for pupillary innervation, this substitution response is systematically studied for different wavelengths and radiant power levels to yield (within the accuracy of the assumptions of the model) spectral threshold curves for the chromatic mechanism as indicated by the pupil. Four mechanisms have thus been identified, having peak sensitivities near 450, 525, 580, and 495 nm. We propose that these represent the blue, green, red and scotopic mechanisms as maintained before the level of the lateral geniculate body.

References

Apr 21, 1969·Annals of the New York Academy of Sciences·M Kohn, M Clynes
Dec 1, 1962·The Journal of Physiology·M ALPERN, F W CAMPBELL

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Citations

Jan 9, 1999·Proceedings. Biological Sciences·J L BarburP Lennie
Jun 1, 1996·Vision Research·E Kimura, R S Young
May 27, 1999·Vision Research·E Kimura, R S Young
Jan 12, 2010·Vision Research·Eiji Kimura, Rockefeller S L Young
Jun 1, 1980·Journal of the Optical Society of America·R S Young, M Alpern

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