Schedule control of quantal and graded dose-effect curves in a drug-drug-saline discrimination

Pharmacology, Biochemistry, and Behavior
D E McMillanW C Hardwick

Abstract

Pigeons were trained to discriminate among 5 mg/kg pentobarbital, 5 mg/kg morphine, and saline when responding was maintained under fixed-interval (FI) or fixed-ratio (FR) reinforcement schedules. After the discrimination was established, other drugs were substituted for the training drugs. After low doses of pentobarbital and chlordiazepoxide, responding shifted from the saline key to the pentobarbital key under both FR and FI schedules. After low doses of morphine and methadone, responding shifted from the saline key to the morphine key under both reinforcement schedules. After all doses of d-amphetamine, responding occurred largely on the saline key under both schedules. Responding also was confined largely to the saline key after phencyclidine administration under the FR schedule, but under the FI schedule, responding shifted from the saline key to the pentobarbital key at high doses of phencyclidine. When responding was maintained under the FR schedule, the dose-response curves for drugs that generalized to the training drugs were quantal in shape, while under the FI schedule, the dose-response curves for drugs that generalized to the training drugs were graded. These data extend observations that FR schedules generate qua...Continue Reading

References

Mar 16, 1976·Psychopharmacologia·F C ColpaertP A Janssen
Jan 16, 1999·Behavioural Pharmacology·D E McMillanS H Snodgrass
Nov 1, 1991·Behavioural Pharmacology·I.P. Stoleman

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Citations

Jan 22, 2003·Peptides·Richard J Bodnar, Maria M Hadjimarkou
Feb 22, 2002·Behavioural Pharmacology·M Li, D E McMillan
Sep 1, 2011·Inflammation Research : Official Journal of the European Histamine Research Society ... [et Al.]·Edfranck de Sousa Oliveira VanderleiNorma Maria Barros Benevides
Feb 8, 2002·Journal of the Experimental Analysis of Behavior·D E McMillanMi Li

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