Color vision plays a very important role in the survival and development of primates. The ability to visually discriminate the target from a background solely by the difference in hue may be the differential for both the search for food and for the escape of predators. In old-world primates, including humans, we observe the presence of three types of cones in the retina and a trichromatic vision for both sexes. However, some genetic and optical problems may cause a change in the sensitivity of some of these types of cones so that they remain functional but exhibit a distinct behavior from the pattern for the species. In Neotropical primates such as the capuchin monkey (Sapajus spp.), we observe a polymorphism in which males are always dichromats and females can be either di or trichromats, with variations between the types of cones even among trichromats females, presenting an intrinsic variability similar to some alterations found in humans. These characteristics make these females a good model for assessing trichromatic vision variations. In this project, we will try to adapt computerized tests already used to discriminate dichromats from trichromats and to adapt them to discriminate also between anomalous trichromacy varieties. In this work we will evaluate three humans and three female capuchin monkeys (Sapajus spp.) that will be genotyped and we will search for chromatic visual patterns that will enable to distinguish them from trichromatic subjects with only computerized evaluation.
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