Abstract
The effects of amphetamine administration on the partial reinforcement extinction effect (PREE) at one trial a day, were examined. Two groups of rats were trained to run in a straight alley. The continuously reinforced (CRF) group received food reward on every trial. The partially reinforced (PRF) group was rewarded on a quasirandom 50% schedule. All animals were then tested inextinction. dl-Amphetamine 1.5 mg/kg was administered in a 2×2 design, i.e., drug-no drug in acquisition and drug-no drug in extinction. The PREE, i.e., increased resistance to extinction exhibited by PRF animals as compared to CRF animals, was obtained in animals that received saline in acquisition, independently of drug treatment in extinction. In contrast, amphetamine administered in acquisition abolished the PREE irrespective of drug treatment in extinction. In addition, amphetamine administered in extinction alone increased resistance to extinction in PRF animals.
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Weiner, I., Bercovitz, H., Lubow, R.E. et al. The abolition of the partial reinforcement extinction effect (PREE) by amphetamine. Psychopharmacology 86, 318–323 (1985). https://doi.org/10.1007/BF00432221
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DOI: https://doi.org/10.1007/BF00432221