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The Incentive Amplifying Effects Of Nicotine Are Reduced By Selective And Non-Selective Dopamine Antagonists In Rats, Matthew I. Palmatier, Marissa R. Kellicut, A. Brianna Sheppard, Russell W. Brown, Donita L. Robinson

Russell W. Brown

Nicotine is a psychomotor stimulant with ‘reinforcement enhancing’ effects — the actions of nicotine in the brain increase responding for non-nicotine rewards. We hypothesized that this latter effect of nicotine depends on increased incentive properties of anticipatory cues; consistent with this hypothesis, multiple laboratories have reported that nicotine increases sign tracking, i.e. approach to a conditioned stimulus (CS), in Pavlovian conditioned-approach tasks. Incentive motivation and sign tracking are mediated by mesolimbic dopamine (DA) transmission and nicotine facilitates mesolimbic DA release. Therefore, we hypothesized that the incentive-promoting effects of nicotine would be impaired by DA antagonists. To test this hypothesis, separate …