Extraoptic Phase Shifting of Circadian Locomotor Rhythm in Salamanders

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Science  13 Jun 1969:
Vol. 164, Issue 3885, pp. 1290-1292
DOI: 10.1126/science.164.3885.1290


Timing of locomotor rhythm in the slimy ralamander, Plethodon glutinosus, can be shifted in phase by the environmental light cycle, whether the animals have eyes or not. Rhythmicity persists at least for the first day when animals are transferred to constant conditions, with a period of about 24 hours, and is therefore circadian in nature. An extraoptic photoreceptor site in the brain is suggested.

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