RELATIVE REINFORCER MAGNITUDE UNDER A NONINDEPENDENT CONCURRENT SCHEDULE OF COCAINE REINFORCEMENT IN RHESUS MONKEYS

Mark E. Llewellyn, Carol Iglauer, James H. Woods

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

Lever pressing by three rhesus monkeys was maintained under a two‐lever concurrent schedule of cocaine reinforcement. Responding on one lever (constant‐dose lever) produced a constant dose of 0.05 or 0.1 mg/kg/injection arranged according to a variable‐interval 1‐min schedule. Responding on the other lever (variable‐dose lever) produced a comparison dose of cocaine (0.013 to 0.8 mg/kg/injection), also under a variable‐interval 1‐min schedule. The two variable‐interval schedules were made nonindependent by arranging that the assignment of a reinforcer by one schedule inactivated the second schedule until the assigned reinforcer had been obtained. This modification ensured that the two cocaine doses were obtained with approximately equal frequency, regardless of the distribution of the subject's responding. Preference, indicated by relative response frequency on the variable‐dose lever, was almost always for the larger of the doses and was a monotonic function of the comparison dose, except at the highest doses. Preferences at the highest comparison doses may have resulted from the low overall response rates exhibited at these doses. Relative response frequencies on the variable‐dose lever roughly matched relative reinforcer magnitude (mg/kg/injection available on the variable‐dose lever divided by the sum of mg/kg/injections available on each lever). 1976 Society for the Experimental Analysis of Behavior

Original languageEnglish (US)
Pages (from-to)81-91
Number of pages11
JournalJournal of the experimental analysis of behavior
Volume25
Issue number1
DOIs
StatePublished - Jan 1976
Externally publishedYes

Keywords

  • choice behavior
  • cocaine reinforcement
  • concurrent schedules
  • lever press
  • relative reinforcer magnitude
  • relative response rates
  • response rates
  • rhesus monkeys
  • variable‐interval schedules of reinforcement

ASJC Scopus subject areas

  • Experimental and Cognitive Psychology
  • Behavioral Neuroscience

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