Development of bingeing in rats altered by a small operant requirement.

Autor: Wojnicki FH; Pennsylvania State University, Nutritional Sciences, 110 Chandlee Laboratory, University Park, PA 16802, United States., Johnson DS; University of Pennsylvania, School of Medicine, Department of Pathology and Laboratory Medicine, Virology, Philadelphia, PA 19104, United States., Charny G; Womack Army Medical Center, Department of Emergency Medicine, 2817 Reilly Street, Fort Bragg, NC 28310, United States., Corwin RL; Pennsylvania State University, Nutritional Sciences, 110 Chandlee Laboratory, University Park, PA 16802, United States. Electronic address: rxc13@psu.edu.
Jazyk: angličtina
Zdroj: Physiology & behavior [Physiol Behav] 2015 Dec 01; Vol. 152 (Pt A), pp. 112-8. Date of Electronic Publication: 2015 Sep 14.
DOI: 10.1016/j.physbeh.2015.09.009
Abstrakt: Previous studies have shown that providing an optional food for a brief period of time to non-food deprived rats on an intermittent basis in the home cage engenders significantly more intake (binge-type behavior) than when the optional food is provided for a brief period on a daily basis. Experiment 1 examined the effects of placing a small operant response requirement on access to an optional food (vegetable shortening) on the establishment of binge-type behavior. Experiment 2 examined the effects of different schedules of reinforcement, a period of abstinence from shortening, and 24h of food deprivation on established binge-type behavior. In Experiment 1 the group of rats with 30-min access to shortening on an intermittent basis in their home cages (IC) consumed significantly more shortening than the group with 30-min daily access in the home cage (DC). The group with 30-min intermittent access in an operant chamber (IO group) earned significantly more reinforcers than the group with 30-min daily access in an operant chamber (DO). In Experiment 2, the IO group earned significantly more reinforcers than the DO group regardless of the response cost, the period of shortening abstinence, and overnight food deprivation. These results demonstrate that while intermittent access generates binge-type eating, the size of the binge (intake) can be altered by different contingency arrangements.
(Copyright © 2015 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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