Interpellet delay and meal patterns in the rat

Rats typically eat in short discrete meal periods separated by long intermeal intervals. The present study measured meal patterns and total intake of food and water when the rate of access to food pellets within the meal was reduced by delaying the time between pellet deliveries. In contrast to studies that reduce the caloric density of food, simple interpellet delay produced a marked reduction in meal size at the shorter (32 sec or less) interpellet delays. However, longer delays (up to 128 sec) produced no further change in average meal size. The results suggest that meal size is determined (1) by a positive feedback component with a relatively short decay time probably based on gustatory stimulation from feeding, and (2) by a negative feedback component capable of integrating total intake across delays of up to 1 hour. Increasing the delay between pellets appeared to interfere with the positive feedback component, but not with the negative feedback component.

[1]  J. Magnen.  The metabolic basis of dual periodicity of feeding in rats , 1981, Behavioral and Brain Sciences.

[2]  C. Snowdon.  Motivation, regulation, and the control of meal parameters with oral and intragastric feeding. , 1969, Journal of comparative and physiological psychology.

[3]  G. Collier,et al.  The ecological determinants of reinforcement in the rat. , 1972, Physiology & behavior.

[4]  P. Rogers,et al.  Investigation of food selection and meal parameters during the development of dietary-induced obesity , 1980 .

[5]  R. Kanarek.  Energetics of meal patterns in rats , 1976, Physiology & Behavior.

[6]  A. Steffens.  Rapid absorption of glucose in the intestinal tract of the rat after ingestion of a meal , 1969 .

[7]  P. G. Clifton,et al.  Feeding rate and meal patterns in the laboratory rat , 1984, Physiology & Behavior.

[8]  P. R. Wiepkema.  Positive feedbacks at work during feeding. , 1971, Behaviour.

[9]  J. Panksepp,et al.  Modification of diurnal feeding patterns by palatability , 1975, Physiology & Behavior.

[10]  D. J. Mcfarland.  Time-Sharing as a Behavioral Phenomenon , 1974 .

[11]  G. Collier,et al.  A cost-benefit analysis of nocturnal feeding in the rat , 1983, Physiology & Behavior.

[12]  P. Killeen.  On the temporal control of behavior. , 1975 .

[13]  C. P. Richter.  Animal Behavior and Internal Drives , 1927, The Quarterly Review of Biology.

[14]  T. Poole.  The Handbook of Ethological Methods, Philip N. Lehner. Garland STMP Press, New York (1979), Price $24.50 , 1980 .

[15]  J. Louis-Sylvestre,et al.  Sensory versus dietary factors in cafeteria-induced overweight , 1984, Physiology & Behavior.

[16]  G. Collier,et al.  Effects of diet and deprivation on meal eating behavior in rats , 1968 .

[17]  H. Kissileff.  Free feeding in normal and "recovered lateral" rats monitored by a pellet-detecting eatometer. , 1970, Physiology & behavior.

[18]  G. Collier,et al.  Changes in rat's meal patterns as a function of the caloric density of the diet , 1986, Physiology & Behavior.

[19]  W. Timberlake,et al.  Adjunctive behavior of the rat under periodic food delivery in a 24-hour environment , 1988 .

[20]  S. Armstrong.  A chronometric approach to the study of feeding behavior , 1980, Neuroscience & Biobehavioral Reviews.