Abstract
The purpose of the present study was to develop an animal model of nicotine self-administration that more closely approximates the conditions of human nicotine use than do existing models. In most nicotine self-administration models, rats acquire self-administration during brief daily sessions in which rapid injections of a relatively high dose of the drug, 0.03 mg/kg, serve as the reinforcer. The present study examined nicotine self-administration in rats that acquired the behavior while having virtually unlimited access to injections of a relatively low dose of the drug; the rats did not have any prior operant training or shaping. Under these conditions, rats readily acquire nicotine self-administration at doses at least as low as 0.00375 mg/kg per injection, and they self-administer throughout the active portion of their light cycle. The daily nicotine intake of rats, which ranged from 0.18 to 1.38 mg/kg per day, appears to be comparable to that of human smokers.
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Received: 14 January 1997 / Final version: 26 June 1997
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Valentine, J., Hokanson, J., Matta, S. et al. Self-administration in rats allowed unlimited access to nicotine. Psychopharmacology 133, 300–304 (1997). https://doi.org/10.1007/s002130050405
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DOI: https://doi.org/10.1007/s002130050405