Discrimination of methadone and cocaine by pigeons without explicit discrimination training

David W. Schaal, Michael Mcdonald, Mark A. Miller, Mark P. Reilly

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Pigeons were trained to peck a key on a variable-interval 2-min schedule of food reinforcement. Prior to each session, either 2.0 mg/kg methadone (n = 3), 3.0 mg/kg cocaine (n = 4), or 5.6 mg/kg cocaine (n = 2) was administered. When each pigeon's rate of pecking was stable, a range of doses of the training drug and saline were administered prior to 20-min extinction sessions separated by at least four training sessions. Rate of pecking during these extinction tests was generally an increasing function of dose, with the lowest rates obtained following saline and low doses and the highest rates obtained following doses near the training doses. Dose functions from pigeons trained with 5.6 mg/kg cocaine were steeper than those from pigeons trained with 3.0 mg/kg cocaine. Pigeons trained with methadone or 3.0 mg/kg cocaine were then given discrimination training, in which food reinforcement followed drug administration and 20-min extinction sessions followed saline administration. Rates of pecking under these conditions quickly diverged until near-zero rates were obtained following saline and high rates were obtained following drug. Discrimination training steepened dose functions for the training drugs, and the effects of several other substituted drugs depended on the pharmacology of the training drug. The pigeons trained with 5.6 mg/kg cocaine were tested with d-amphetamine, methadone, and morphine prior to discrimination training. d-Amphetamine increased rates dose dependently, and methadone and morphine did not. The results suggest that discriminative control by methadone and cocaine was established without explicit discrimination training.

Original languageEnglish (US)
Pages (from-to)193-203
Number of pages11
JournalJournal of the Experimental Analysis of Behavior
Volume66
Issue number2
DOIs
StatePublished - Jan 1 1996

Fingerprint

Methadone
Columbidae
Cocaine
Pharmaceutical Preparations
Dextroamphetamine
Morphine
Reinforcement Schedule
Food
Discrimination (Psychology)
Pharmacology
Psychological Extinction

All Science Journal Classification (ASJC) codes

  • Experimental and Cognitive Psychology
  • Behavioral Neuroscience

Cite this

Discrimination of methadone and cocaine by pigeons without explicit discrimination training. / Schaal, David W.; Mcdonald, Michael; Miller, Mark A.; Reilly, Mark P.

In: Journal of the Experimental Analysis of Behavior, Vol. 66, No. 2, 01.01.1996, p. 193-203.

Research output: Contribution to journalArticle

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