Abstract

The eye ofAplysia contains a circadian oscillator which can be entrained by cycles of white light (Jacklet, 1969b). Photoreceptors sufficient for entrainment of this oscillator reside within the eye itself (Eskin, 1971). We now report that extraocular photoreceptors can also entrain the ocular oscillator. Our evidence is: TheAplysia nervous system contains several circadian oscillators and several photoreceptors. Functional integrity of the organism requires that these elements be synchronized with one another. A neural, as opposed to hormonal, link is required for coupling the circadian oscillator in the eye to other neural sources of temporal information.

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