{"title":"Arne Valberg","description":null,"products":[{"product_id":"from-pigments-to-perception-book-arne-valberg-9781461366546","title":"From Pigments to Perception","description":"Proceedings of a NATO ARW on Advances in Understanding Visual  Processes: Convergence of Neurophysiological and Psychological  Evidence, held in Roros, Norway, August 6-10, 1990","brand":"WoB","offers":[{"title":"GB \/ NEW \/ INGRAM","offer_id":52681624453393,"sku":"NLS9781461366546","price":0.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4072\/6801\/files\/9781461366546.jpg?v=1762316130"},{"product_id":"from-pigments-to-perception-book-arne-valberg-9780306439056","title":"From Pigments to Perception","description":"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.","brand":"WoB","offers":[{"title":"GB \/ NEW \/ INGRAM","offer_id":52686983594257,"sku":"NLS9780306439056","price":0.0,"currency_code":"GBP","in_stock":true},{"title":"US \/ NEW \/ INGRAM","offer_id":52734882480401,"sku":"NIN9780306439056","price":0.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/4072\/6801\/files\/9780306439056.jpg?v=1786106732"}],"url":"https:\/\/www.worldofbooks.com\/collections\/author-books-by-arne-valberg.oembed","provider":"World of Books ","version":"1.0","type":"link"}