Effects of prefeeding on the DRL performance of rats with septal lesions

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Conducted 2 experiments with a total of 17 Long-Evans male hooded rats (8 with septal lesions and 9 unoperated controls) to study the effects of prefeeding prior to daily sessions on a DRL-20 schedule. Prefeeding reduced responses and increased reinforcement in the case of septal Ss, regardless of the level of body weight. In the case of normal Ss, prefeeding led to a decrease in responding and an increase in the number of reinforcements obtained only when the Ss were at 85% of ad lib body weight. At ad lib levels, prefeeding, although it decreased responding, also decreased the frequency of obtained reinforcements. Results suggest an impairment in normal Ss in the discrimination of response feedback by stimulation arising from stomach distention. (18 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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