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Journal of Experimental Biology 12,39-43 (1935)
Published by Company of Biologists 1935

Studies in Reptilian Colour Response : II. The Role of Retinal and Dermal Photoreceptors in the Pigmentary Activity of the Chameleon

A. ZOOND ¹ and N. A. H. BOKENHAM ¹

¹ Department of Zoology, University of Cape Town

1. A method has been devised for measuring the effect of retinal stimulation with the exclusion of light from the dermal photoreceptors.

2. Stimulation of the dermal photoreceptors and exposure of the retinal receptors to light falling on a black surface independently cause an inhibition of the pigmentomotor apparatus.

3. The response to white background in strong light depends upon the simultaneous stimulation of the retinal and dermal photoreceptors.

4. The stimulation of the retinal receptors causes an inhibition of the inhibition resulting from the direct stimulation of the dermal photoreceptors.

5. In weak light the white background response is reversed. This effect is due to retinal stimulation and is independent of the dermal receptors.