Abstract
The effects of several opioid agonists and antagonists were examined in pigeons performing under a delayed matching-to-sample procedure. The mu agonists morphine and l-methadone, the kappa agonists U 50,488 and ethylketocyclazocine, and the opioid antagonist naloxone had no effect on the accuracy of responding. These drugs were, however, behaviorally active as evidenced by the dose-dependent decreases in rates of responding associated with their administration. In contrast, the sigma agonists (+) N-allylnormetazocine and phencyclidine decreased the accuracy of responding in a dose-dependent fashion. The relative magnitude of these drug-induced decreases in accuracy were similar across the no delay (0-s), short (2-s), and long (8-s) delay intervals. For these drugs, accuracy-decreasing effects were obtained only at doses that reduced rates of responding. The results of the present investigation parallel those reported in pigeons responding under drug discrimination tasks, in which the discriminative stimulus properties produced by the mu and kappa agonists are similar to each other but distinguishable from those produced by the sigma agonists.
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Recipient of Research Scientist Development Award DA 00033 from the National Institute on Drug Abuse
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Picker, M., Massie, C.A. & Dykstra, L.A. Evaluation of the effects of opioid agonists and antagonists under a delayed matching-to-sample procedure in pigeons. Psychopharmacology 93, 230–236 (1987). https://doi.org/10.1007/BF00179940
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DOI: https://doi.org/10.1007/BF00179940