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From Pigments to Perception - Advances in Understanding Visual Processes (Paperback, Softcover reprint of the original 1st ed. 1991)
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From Pigments to Perception - Advances in Understanding Visual Processes (Paperback, Softcover reprint of the original 1st ed. 1991)
Series: NATO Science Series A:, 203
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Two techniques were used to estimate the L/M cone ratio, best-fit
linear sum of the L- and M-cone spectral sensitivities to
heterochromatic flicker photometric spectral sensitivity and
psychometric function shape for point source detection of lights of
varying wavelength. Data from five color-normal observers run on
both paradigms all are consistent with a preponderance of L-cones
relative to M-cones though there are individual differences in the
estimates of L/M cone ratio. The observers showed congruence in
their individual results across technique. In a separate study, the
perceptual consequences of individual variation in L/M cone
populations were evaluated by looking for a relation between
flicker photometric spectral sensitivity and the spectral locus of
equilibrium yellow. No significant relation was found, suggesting
that receptor populations do not play a major role in the
normalization of the perceptual red/green opponent channel.
ACKNOWLEDGEMENT Supported in part by USPH NEI grant EY00901.
REFERENCES Adam, A. (1969) Foveal red-green ra. C10S c:,f normals,
colorblinds and heterozygotes. Proceedings Tel-Hasrcomer Hospital
(Tel-Aviv). 8: 2-6. Ahnelt, P. , H. Kolb and R. Pflug. (1987).
Identification of a subtype of cone photoreceptor, likely to be
blue sensitive, in the human retina. Journal of Compa:cative
Neurology. 255: 18-34. Alpern, M. and E. Pugh. (1977). variation in
the action spectrum of erythrolabe among deuteranopes. Journal of
Physiology (London). 266: 613-646. Boynton, R. (1979). Human Color
Vision. New York, Holt, Rinehart and Winston. Brindley, G. (1954)
The summation areas of human colour-receptive mechanisms at
increment threshold.
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