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  • Title: Simultaneous color contrast in the foraging swallowtail butterfly, Papilio xuthus.
    Author: Kinoshita M, Takahashi Y, Arikawa K.
    Journal: J Exp Biol; 2008 Nov; 211(Pt 21):3504-11. PubMed ID: 18931322.
    Abstract:
    This study demonstrates that the color vision of foraging Japanese yellow swallowtail butterflies, Papilio xuthus, involves simultaneous color contrast. We trained newly emerged Papilio to select a disk of pale green among a set of differently colored disks presented on a black background. When the same set of disks was presented on blue background, the pale green-trained butterflies selected blue-green. The difference in spectra between pale green and blue green was similar to the spectrum of yellow for human vision, suggesting that blue induces yellow. Similarly, the pale green-trained Papilio selected a more bluish spring green on yellow background. We also trained Papilio with orange disks and tested on a green and violet background. The results showed that green induced violet and vice versa. Taken together, we concluded that simultaneous color contrast of Papilio is similar to the effect of complementary colors in human color vision.
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