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CONCURRENT PERFORMANCES: REINFORCEMENT BY DIFFERENT DOSES OF INTRAVENOUS COCAINE IN RHESUS MONKEYS 1
Author(s) -
Iglauer Carol,
Woods James H.
Publication year - 1974
Publication title -
journal of the experimental analysis of behavior
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.75
H-Index - 61
eISSN - 1938-3711
pISSN - 0022-5002
DOI - 10.1901/jeab.1974.22-179
Subject(s) - lever , reinforcement , psychology , self administration , interval (graph theory) , anesthesia , social psychology , mathematics , medicine , physics , quantum mechanics , combinatorics
Different doses of intravenous cocaine reinforced the lever pressing of rhesus monkeys under two‐lever concurrent or concurrent‐chain schedules. Under the concurrent procedure, responding produced drug reinforcers arranged according to independent variable‐interval 1‐min schedules. Under the concurrent‐chain procedure, responding in the variable‐interval link led to one of two mutually exclusive, equal‐valued, fixed‐ratio links; Final Acceptance completion of the ratio produced a drug reinforcer. Under both procedures, responding on one lever produced a constant dose of 0.05 or 0.1 mg/kg/injection, while on the other lever, dose was systematically varied within a range of 0.013 to 0.8 mg/kg/injection. Preference, indicated by relative response frequency on the variable‐dose lever during the variable‐interval link, was always for the larger of the doses. Relative response frequencies on the variable‐dose lever roughly matched relative drug intake (mg/kg of drug obtained on variable lever divided by mg/kg of drug obtained on both levers). For many dose comparisons, responding occurred and reinforcers were obtained almost exclusively on the preferred lever. Overall variable‐interval rates generally were lower than with other reinforcers, and these low rates, under the experimental conditions, may have occasioned the exclusive preferences.