Journal
BIOLOGY LETTERS
Volume 11, Issue 10, Pages -Publisher
ROYAL SOC
DOI: 10.1098/rsbl.2015.0687
Keywords
colour; optomotor; motion; photoreceptor; butterfly
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Funding
- JSPS [26650116, 24570084, 26251036]
- Grants-in-Aid for Scientific Research [24570084, 26650116, 26251036] Funding Source: KAKEN
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Many insects' motion vision is achromatic and thus dependent on brightness rather than on colour contrast. We investigate whether this is true of the butterfly Papilio xuthus, an animal noted for its complex retinal organization, by measuring head movements of restrained animals in response to moving two-colour patterns. Responses were never eliminated across a range of relative colour intensities, indicating that motion can be detected through chromatic contrast in the absence of luminance contrast. Furthermore, we identify an interaction between colour and contrast polarity in sensitivity to achromatic patterns, suggesting that ON and OFF contrasts are processed by two channels with different spectral sensitivities. We propose a model of the motion detection process in the retina/lamina based on these observations.
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