Abstract
To date, only 1 study has evaluated the impact of a Pavlovian drug conditional stimulus (CS) on operant responding. A within-subject operant 1-lever go/no-go (across sessions) design was used to evaluate the impact of Pavlovian contingencies on the discriminative stimulus effects of nicotine (0.4 mg/kg) and ethanol (800 mg/kg) in male Sprague Dawley rats. Drugs were administered 10 min before each acquisition and test session. One drug predicted sessions of food reinforcement and the other drug predicted sessions of nonreinforcement; stimulus roles were counterbalanced. In Experiment 1 (n = 7), operant lever pressing was initially maintained on a VI-30 s schedule of food reinforcement. This phase was followed by 20 (CS+ vs. CS-) Pavlovian drug discrimination training sessions without the levers present. Two extinction tests revealed significantly more operant lever pressing under the CS+ drug conditions compared to the CS- drug conditions, suggesting evidence for Pavlovian-instrumental transfer. Operant training significantly strengthened stimulus control. In Experiment 2 (n = 7), the drugs functioned as operant drug discriminative stimuli first. Next, the predictive roles of the drug SDs and SΔs were reversed under Pavlovian CS- and CS+ contingencies, respectively. The original stimulus control was significantly undermined but was not reversed. These studies suggest that Pavlovian drug-reinforcer contingencies embedded within the operant 3-term contingency may play a partial role in mediating the discriminative stimulus effects of drugs.
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This work is in memory of my mentor and friend, Philip J. Bersh. I thank Dr. Rick Bevins (University of Nebraska) for reviewing a version of this manuscript. Special thanks to Beth Matano and Lindsay Cotterly for their lab time.
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Troisi, J.R. Pavlovian-Instrumental Transfer of the Discriminative Stimulus Effects of Nicotine and Ethanol in Rats. Psychol Rec 56, 499–512 (2006). https://doi.org/10.1007/BF03396030
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DOI: https://doi.org/10.1007/BF03396030