Circadian Rhythm: Population of Interacting Neurons

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Science  15 Oct 1971:
Vol. 174, Issue 4006, pp. 299-302
DOI: 10.1126/science.174.4006.299


The circadian rhythm in the requency of compound action potentials recorded from the isolated eye of Aplysia is a consequence of interactions among the cells of the retinal population. As the population number is reduced to a critical 20 percent, progressively shorter circadian periods and ranges are expressed. Below the critical number, the population oscillates at ultradian frequencies.