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Am J Physiol Regul Integr Comp Physiol 270: R793-R800, 1996;
0363-6119/96 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 270, Issue 4 793-R800, Copyright © 1996 by American Physiological Society

ARTICLES

Deterministic and probabilistic control of the behavior of rats ingesting liquid diets

J. D. Davis
E. W. Bourne Behavioral Research Laboratory, New York Hospital-Cornell Medical Center, White Plains 10960, USA.

The probability distributions of bouts of licking and pauses between them in rats ingesting sucrose solutions were studied to determine if the durations of these ingestive and noningestive acts were controlled by a deterministic or probabilistic decision rule in the central nervous system. The duration of the bouts of licking could be modeled by a Poisson process, indicating that these bouts were terminated by a probabilistic rule. Three different types of pauses terminated the bouts of licking. Each averaged 0.3, 1.5, or 50-60 s in duration. The two longer pauses could be modeled by a Poisson process, indicating that their termination was also probabilistic in nature. The shorter pauses averaging 0.3 s could not and are more likely deterministically controlled.


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