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Under traditional water-deprived conditions, both LiCl and morphine produce comparable suppression of saccharin consumption after repeated pairings. However, under conditions of spaced food deliveries (i.e., schedule-induced polydipsia; SIP), morphine produces a significantly weaker suppression than LiCl. The differential responses have been attributed to an increase in the rewarding effects of drugs...
A conceptual structure for drug addiction focused on allostatic changes in reward function that lead to excessive drug intake provides a heuristic framework with which to identify the neurobiologic neuroadaptive mechanisms involved in the development of drug addiction. The brain reward system implicated in the development of addiction is comprised of key elements of a basal forebrain macrostructure...
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