Circadian Rhythm of Optic Nerve Impulses Recorded in Darkness from Isolated Eye of Aplysia
- 2 May 1969
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 164 (3879) , 562-563
- https://doi.org/10.1126/science.164.3879.562
Abstract
The isolated eye of the sea hare Aplysia californica shows a circadian rhythm of optic nerve impulses when kept in total darkness. Peak activity on the first day of isolation occurs during the projected "dawn" of the light-dark cycle to which the whole animal had previously been entrained. Eyes from animals previously exposed to constant light show a free-running rhythm. This simple photoreceptor provides a quantized output with an ideal control (the other eye) for studies on rhythms.Keywords
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