Disentangling the nature of the nicotine stimulus

Rick A. Bevins, Scott T. Barrett, Robert J. Polewan, Steven T. Pittenger, Natashia Swalve, Sergios Charntikov

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Learning involving interoceptive stimuli likely plays an important role in many diseases and psychopathologies. Within this area, there has been extensive research investigating the interoceptive stimulus effects of abused drugs. In this pursuit, behavioral pharmacologists have taken advantage of what is known about learning processes and adapted the techniques to investigate the behavioral and receptor mechanisms of drug stimuli. Of particular interest is the nicotine stimulus and the use of the two-lever operant drug discrimination task and the Pavlovian drug discriminated goal-tracking task. There is strong concordance between the two methods when using "standard" testing protocols that minimize learning on test days. For example, ABT-418, nornicotine, and varenicline all fully evoked nicotine-appropriate responding. Notably, research from our laboratory with the discriminated goal-tracking task has used an alternative testing protocol. This protocol assesses stimulus substitution based on how well extinction learning using a non-nicotine ligand transfers back to the nicotine stimulus. These findings challenge conclusions based on more "standard" testing procedures (e.g., ABT-418 is not nicotine-like). As a starting point, we propose Thurstone scaling as a quantitative method for more precisely comparing transfer of extinction across doses, experiments, and investigators. We close with a discussion of future research directions and potential implications of the research for understanding interoceptive stimuli.

Original languageEnglish (US)
Pages (from-to)28-33
Number of pages6
JournalBehavioural Processes
Volume90
Issue number1
DOIs
StatePublished - May 2012

Keywords

  • Drug discrimination
  • Extinction learning
  • Nornicotine
  • Pavlovian conditioning
  • Smoking
  • Tobacco
  • Varenicline

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Behavioral Neuroscience

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