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There is a high coexistence of substance abuse in humans with eating disorders. One theory offered to account for this fact is that a common biochemical substrate may exist that mediates both processes. Brain neuropeptide Y (NPY) is one neurochemical system that might contribute to these separate, yet related, problems. To clarify the role of NPY in mediating reward processes and the possible interaction...
Rats exhibit individual differences in their propensity to ingest sucrose and in their feeding response to low doses of amphetamine (AMP). Rats with high baseline sugar intake (HIGH) show a decrease in sugar consumption in response to AMP, while rats with low baseline sugar intake (LOW) show an increase in consumption (33,34). At present, it is not known whether LOW and HIGH rats would be differentially...
In this paper we report on the effects of intra-VTA infusion of opioid agonists on rat ingestive behavior in a variety of experimental contexts. When the animals were tested outside of their home cages surrounded only by food-pellets (Experiment 1), the injection of the mu-opioid agonist DAMGO, but not the kappa-opioid agonist U-50,488H, into the ventral tegmental area facilitated food-related behaviors,...
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