Fig. 1. Chromaticities of natural Abuta fluminum leaves and fruit and of the model colours used in this experiment, plotted in a standard chromaticity diagram modified for the common marmoset eye (see text; Macleod and Boynton, 1979; Regan et al., 1998). Colour differences on the horizontal axis are visible only to trichromats. Note that distance in this diagram does not directly predict colour discriminability. For example, in general, a given colour distance on the vertical axis will be less discriminable than on the horizontal. L, leaf; U, unripe; M, mid-ripe; R, ripe.

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