Abstract

A circadian rhythm appears to control the termination of the photorefractory period in redheaded buntings. A 6-h photophase coupled with scotophases of varying durations does not terminate the refractory period in the cycles of 12 (6L:6D), 36 (6L:30D), and 60 (6L:54D) h but terminates it in the cycles of 24 (6L:18D), 48 (6L:42D), and 72 (6L:66D) h.

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