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Am J Physiol Regul Integr Comp Physiol 263: R51-R58, 1992;
0363-6119/92 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 263, Issue 1 51-R58, Copyright © 1992 by American Physiological Society

ARTICLES

Isoperiodic neuronal activity in suprachiasmatic nucleus of the rat

J. D. Miller and C. A. Fuller
Department of Animal Physiology, University of California, Davis 95616.

A subpopulation of neurons in the suprachiasmatic nucleus (SCN) is shown here to exhibit isoperiodic bursting activity. The period of discharge in these cells may be lengthened or the periodicity may be transiently disrupted by photic stimulation. It is suggested that many, if not all, of these cells are vasoactive intestinal polypeptide (VIP) neurons. It is shown that the ultradian periodicity of these cells, estimates of the VIP neuron population size in the SCN, effects of partial lesions on tau (period), and estimates of the phase stability of SCN-driven circadian rhythms are consistent with a strongly coupled, multioscillator model of circadian rhythmicity, in which the oscillator population constitutes a restricted subset of the SCN neuronal population.


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[Abstract] [Full Text] [PDF]


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