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. 1977 Jul 1;197(4298):86-9.
doi: 10.1126/science.867057.

Efferent optic nerve fibers mediate circadian rhythms in the Limulus eye

R B Barlow Jr, S J Bolanowski Jr, M L Brachman

Efferent optic nerve fibers mediate circadian rhythms in the Limulus eye

R B Barlow Jr et al. Science. .

Abstract

When the horseshoe crab is kept in constant darkness, the lateral eye produces larger electroretinographic and optic nerve responses at night than during the day. These circadian rhythms are mediated by synchronous bursts of efferent impulses in the optic nerve trunk. The endogenous efferent activity appears to increase both the gain and the quantum catch of the photoreceptors.

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