Experimental evidence that primate trichromacy is well suited for detecting primate social colour signals

Chihiro Hiramatsu, Amanda D. Melin, William L. Allen, Constance Dubuc, James P. Higham

    Research output: Contribution to journalArticlepeer-review


    Primate trichromatic colour vision has been hypothesized to be well tuned for detecting variation in facial coloration, which could be due to selection on either signal wavelengths or the sensitivities of the photoreceptors themselves. We provide one of the first empirical tests of this idea by asking whether, when compared with other visual systems, the information obtained through primate trichromatic vision confers an improved ability to detect the changes in facial colour that female macaque monkeys exhibit when they are proceptive. We presented pairs of digital images of faces of the same monkey to human observers and asked them to select the proceptive face. We tested images that simulated what would be seen by common catarrhine trichromatic vision, two additional trichromatic conditions and three dichromatic conditions. Performance under conditions of common catarrhine trichromacy, and trichromacy with narrowly separated LM cone pigments (common in female platyrrhines), was better than for evenly spaced trichromacy or for any of the dichromatic conditions. These results suggest that primate trichromatic colour vision confers excellent ability to detect meaningful variation in primate face colour. This is consistent with the hypothesis that social information detection has acted on either primate signal spectral reflectance or photoreceptor spectral tuning, or both.

    Original languageEnglish (US)
    Article number20162458
    JournalProceedings of the Royal Society B: Biological Sciences
    Issue number1856
    StatePublished - Jun 14 2017


    • Colour vision
    • Face colour variation
    • Primate
    • Reproductive state
    • Social signal
    • Trichromacy

    ASJC Scopus subject areas

    • General Biochemistry, Genetics and Molecular Biology
    • General Immunology and Microbiology
    • General Environmental Science
    • General Agricultural and Biological Sciences


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