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Table 1 Colour discrimination thresholds summary from the male Alouatta caraya and female Alouatta seniculus

From: Uniform trichromacy in Alouatta caraya and Alouatta seniculus: behavioural and genetic colour vision evaluation

Subject Mean (u’v’ unit) Standard deviation
Male Alouatta caraya
 Ellipse 1 0.010475 0.004822
 Ellipse 2 0.00921 0.003624
 Ellipse 3 0.010955 0.006259
Female Alouatta seniculus
 Ellipse 1 0.016775 0.008880
 Ellipse 2 0.016935 0.007730
 Ellipse 3 0.01839 0.007384
  1. Subjects were tested using an adaptation from Goulart et al. [24] colour vision test, for the Alouatta genus. Mean vector length threshold of the 20 vectors for each center displayed in CIE 1976 u’v’ CIE chromaticity diagram units