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Psychopharmacology

, Volume 171, Issue 2, pp 173–178 | Cite as

Nicotine enhances responding with conditioned reinforcement

  • Peter Olausson
  • J. David Jentsch
  • Jane R. Taylor
Original Investigation

Abstract

Rationale

The mesolimbic dopamine system has been implicated in the primary reinforcing properties of drugs of abuse as well as in enhanced responding with conditioned reinforcement produced by psychomotor stimulant drugs. Despite clinical observations that nicotine self-administration (i.e. smoking) depends strongly upon conditioned reinforcement (i.e. cues support smoking behavior), little is known about whether nicotine directly affects motivational processes.

Objective

In these experiments, we investigated whether acute nicotine would influence responding with conditioned reinforcement and the degree to which pretreatment with the nicotinic acetylcholine receptor (nAChR) antagonist mecamylamine would modify any nicotine-induced behavioral effects.

Methods

After subjects had been trained to associate an initially neutral stimulus with water reward, they received acute nicotine (43,25–350 µg/kg SC; −5 min) or saline injections and were tested on the acquisition of a new response for conditioned reinforcement paradigm. In separate experiments, the effect of pretreatment with the nicotinic acetylcholine receptor antagonist mecamylamine (300 or 1000 µg/kg SC; −20 min) alone, or in combination with nicotine (350 µg/kg SC; −5 min), on conditioned reinforcement was also examined.

Results

Acute nicotine injection produced a selective enhancement of responding with conditioned reinforcement (i.e. on the CR lever), without producing non-selective increases in overall responding. The effect of nicotine (350 µg/kg SC; −5 min) was selectively blocked by mecamylamine (300 µg/kg).

Conclusions

These findings demonstrate that acute exposure to nicotine augments the control over behavior by a conditioned reinforcer, suggesting that nicotine may enhance motivational processes.

Keywords

Conditioned reinforcement Incentive motivation Nicotine Rat 

Notes

Acknowledgements

The authors gratefully acknowledge the valuable technical assistance of Ms. Victoria Stewart. The present study was supported by PHS grant (DA 11717) to J.R.T., a Fredrik & Inger Thuring's Foundation award to P.O. and a pilot project grant from the Yale TTURC (DA 13334) P.O. is the recipient of a post-doctoral fellowship from the Swedish Brain Foundation.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • Peter Olausson
    • 1
  • J. David Jentsch
    • 1
    • 2
  • Jane R. Taylor
    • 1
  1. 1.Department of Psychiatry, Laboratory of Molecular PsychiatryYale UniversityNew HavenUSA
  2. 2.Department of PsychologyUCLALos AngelesUSA

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