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J Neurophysiol 81: 950-953, 1999;
0022-3077/99 $5.00
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The Journal of Neurophysiology Vol. 81 No. 2 February 1999, pp. 950-953
Copyright ©1999 by the American Physiological Society

RAPID COMMUNICATION

Gating of Afferent Input by a Central Pattern Generator

Ralph A. DiCaprio

Neurobiology Program, Department of Biological Sciences, Ohio University, Athens, Ohio 45701

Gating of afferent input by a central pattern generator. Intracellular recordings from the sole proprioceptor (the oval organ) in the crab ventilatory system show that the nonspiking afferent fibers from this organ receive a cyclic hyperpolarizing inhibition in phase with the ventilatory motor pattern. Although depolarizing and hyperpolarizing current pulses injected into a single afferent will reset the ventilatory motor pattern, the inhibitory input is of sufficient magnitude to block afferent input to the ventilatory central pattern generator (CPG) for ~50% of the cycle period. It is proposed that this inhibitory input serves to gate sensory input to the ventilatory CPG to provide an unambiguous input to the ventilatory CPG.

0022-3077/99 $5.00 Copyright © 1999 The American Physiological Society



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