Photoreception and Entrainment of Cockroach Activity Rhythms

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Science  14 May 1965:
Vol. 148, Issue 3672, pp. 958-959
DOI: 10.1126/science.148.3672.958


In the cockroach there are two distinct sets of photoreceptors—the compound eyes and the ocelli—which may function as a sensory input whereby circadian locomotor rhythms are entrained by environmental light cycles. Surgical removal of the ocelli did not interfere with normal entrainment, but covering over the compound eyes effected a loss of entrainment.

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