Circadian Involvement in Termination of the Refractory Period in Two Sparrows

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Science  08 Dec 1972:
Vol. 178, Issue 4065, pp. 1112-1113
DOI: 10.1126/science.178.4065.1112


Endogenous daily rhythmicity is involved in the short-day photoperiodic response of breaking the refractory period in both white-crowned and golden-crowned sparrows. Under a modified "coincidence model," short-day photoperiodic induction occurs when light is noncoincident with a specific phase of an internal rhythm.