Abstract
THE sensitivity of the eyes of nocturnal animals to infra-red radiations has long been a matter of much speculation. Sensitivity into the far infra-red has been claimed by Vanderplank1 for the owl—an animal with a rod retina; Matthews and Matthews2, however, working on the same animal, did not find any retinal action potentials in response to infra-red stimulation, and Hecht and Pirenne3, who were using the pupillo-motor response of the owl's eye as an index of wave-length sensitivity, found no observable contraction in response to stimulation with infra-red radiations of an energy content of 5 × 106 times that of green light, which produced a marked iris contraction.
Published Version
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