Modeling Trichromatic Color Appearance with Only Two Spectrally Distinct Photopigments
نویسندگان
چکیده
Protanomaly is a common abnormality of color vision in which the long wavelength sensitive cone is lacking. Protanomalous observers are trichromatic with reduced ability to discriminate colors in the red-green part of the spectrum because the photopigments that mediate discrimination in this range are abnormally similar differing in one of two ways; first, by only a few nanometers in peak sensitivity, or second, differing only in optical density. We present a functional model that estimates the color appearance and spectral color boundaries for these two types of protanomaly. The model predicts rather similar appearance of Munsell color chips but radically different spectral color characteristics for the protanomalous observers compared to normal color observers.
منابع مشابه
Primate photopigments and primate color vision.
The past 15 years have brought much progress in our understanding of several basic features of primate color vision. There has been particular success in cataloging the spectral properties of the cone photopigments found in retinas of a number of primate species and in elucidating the relationship between cone opsin genes and their photopigment products. Direct studies of color vision show that...
متن کاملDetection of Fruit and the Selection of Primate Visual Pigments for Color Vision
Primates have X chromosome genes for cone photopigments with sensitivity maxima from 535 to 562 nm. Old World monkeys and apes (catarrhines) and the New World (platyrrhine) genus Alouatta have separate genes for 535-nm (medium wavelength; M) and 562-nm (long wavelength; L) pigments. These pigments, together with a 425-nm (short wavelength) pigment, permit trichromatic color vision. Other platyr...
متن کاملTetrachromatic Color Vision
The term“tetrachromacy” describes the physiological possession of four different classes of simultaneously functioning retinal photopigments (also called “weak tetrachromacy”). From an empirical standpoint, tetrachromatic color vision (or “strong tetrachromacy”) additionally requires demonstrating that mixtures of four independent appropriately chosen primary lights will simulate all distinctio...
متن کاملThree spectrally distinct photoreceptors in diurnal and nocturnal Australian ants.
Ants are thought to be special among Hymenopterans in having only dichromatic colour vision based on two spectrally distinct photoreceptors. Many ants are highly visual animals, however, and use vision extensively for navigation. We show here that two congeneric day- and night-active Australian ants have three spectrally distinct photoreceptor types, potentially supporting trichromatic colour v...
متن کاملA perspective on color vision in platyrrhine monkeys
Studies carried out over the past two decades show that many platyrrhine (New World) monkeys have polymorphic color vision. This condition results from the sorting of allelic versions of X-chromosome cone opsin genes at a single gene site, yielding a mixture of dichromatic and trichromatic phenotypes in the population. Two genera of platyrrhine monkey are known to deviate significantly from thi...
متن کامل