Abstract
Rationale
Nicotine (NIC) administration can increase behaviors that result in delivery of non-drug reinforcers (e.g., salient sensory stimuli). However, little is known about the circumstances under which NIC increases these behaviors.
Objective
The present studies sought to extend the reinforcement enhancing effects of NIC to sucrose rewards for which intensity could be systematically manipulated.
Method
In Experiment 1, rats were trained to respond for sucrose (30% w/v) on a progressive ratio (PR) schedule of reinforcement and were pretreated with NIC (0.4 mg/kg free-base) or physiological saline (SAL). The intensity of the sucrose reward was manipulated over subsequent testing sessions (0–60% w/v). Similar procedures were used in Experiment 2; however, each subject received only one sucrose concentration (0–20%) to control for conditioning history. In Experiment 3, a fixed ratio 3 (FR3) schedule of reinforcement was used to investigate putative activating effects of NIC. Experiment 4 investigated whether NIC pretreatment would reduce sucrose intake in limited-access drinks.
Results
In Experiment 1, NIC increased the motivation to obtain all sucrose concentrations, including water. However, when conditioning history was controlled (Experiment 2) the reinforcement enhancing effects of NIC were systematically related to the strength of the reinforcer. In Experiment 3, NIC neither increased nor decreased responding for sucrose. In Experiment 4, NIC reduced sucrose intake, but only at concentrations that resulted in peak drink volumes (5–20%).
Conclusion
The results suggest that the reinforcement enhancing effects of NIC depend on conditioning history and do not appear to be the result of simple behavioral activation.
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All experiments followed the “Principles of laboratory animal care” (NIH #85-23, revised 1985) and were approved by the Kansas State University Institutional Animal Care and Use Committee (Assurance # A3609-01). This research was supported by NIH grant DA-24801. We thank Scott Jones and Ashley Sheppard for their comments on a previous version of the manuscript.
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Palmatier, M.I., O’Brien, L.C. & Hall, M.J. The role of conditioning history and reinforcer strength in the reinforcement enhancing effects of nicotine in rats. Psychopharmacology 219, 1119–1131 (2012). https://doi.org/10.1007/s00213-011-2439-5
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DOI: https://doi.org/10.1007/s00213-011-2439-5