Bare skin, blood and the evolution of primate colour vision.

Bibliographic Collection: 
Publication Type: Journal Article
Authors: Changizi, Mark A; Zhang, Qiong; Shimojo, Shinsuke
Year of Publication: 2006
Journal: Biol Lett
Volume: 2
Issue: 2
Pagination: 217-21
Date Published: 2006 Jun 22
Publication Language: eng
ISSN: 1744-9561
Keywords: Animals, Biological Evolution, Color Perception, Humans, Oxygen, Oxyhemoglobins, Primates, Retinal Cone Photoreceptor Cells, Skin, Spectrum Analysis

We investigate the hypothesis that colour vision in primates was selected for discriminating the spectral modulations on the skin of conspecifics, presumably for the purpose of discriminating emotional states, socio-sexual signals and threat displays. Here we show that, consistent with this hypothesis, there are two dimensions of skin spectral modulations, and trichromats but not dichromats are sensitive to each. Furthermore, the M and L cone maximum sensitivities for routine trichromats are optimized for discriminating variations in blood oxygen saturation, one of the two blood-related dimensions determining skin reflectance. We also show that, consistent with the hypothesis, trichromat primates tend to be bare faced.

DOI: 10.1098/rsbl.2006.0440
Alternate Journal: Biol. Lett.
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