Reinforcer magnitude and rate dependency: Evaluation of resistance-to-change mechanisms

Jonathan W. Pinkston, Brett C. Ginsburg, Richard J. Lamb

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Under many circumstances, reinforcer magnitude appears to modulate the rate-dependent effects of drugs such that when schedules arrange for relatively larger reinforcer magnitudes rate dependency is attenuated compared with behavior maintained by smaller magnitudes. The current literature on resistance to change suggests that increased reinforcer density strengthens operant behavior, and such strengthening effects appear to extend to the temporal control of behavior. As rate dependency may be understood as a loss of temporal control, the effects of reinforcer magnitude on rate dependency may be due to increased resistance to disruption of temporally controlled behavior. In the present experiments, pigeons earned different magnitudes of grain during signaled components of a multiple FI schedule. Three drugs, clonidine, haloperidol, and morphine, were examined. All three decreased overall rates of key pecking; however, only the effects of clonidine were attenuated as reinforcer magnitude increased. An analysis of within-interval performance found rate-dependent effects for clonidine and morphine; however, these effects were not modulated by reinforcer magnitude. In addition, we included prefeeding and extinction conditions, standard tests used to measure resistance to change. In general, rate-decreasing effects of prefeeding and extinction were attenuated by increasing reinforcer magnitudes. Rate-dependent analyses of prefeeding showed rate-dependency following those tests, but in no case were these effects modulated by reinforcer magnitude. The results suggest that a resistance-to-change interpretation of the effects of reinforcer magnitude on rate dependency is not viable.

Original languageEnglish (US)
Pages (from-to)629-636
Number of pages8
JournalBehavioural pharmacology
Volume25
Issue number7
DOIs
StatePublished - Oct 2014

Keywords

  • clonidine
  • fixed interval
  • haloperidol
  • key peck
  • morphine
  • pigeon
  • rate dependency
  • reinforcer magnitude

ASJC Scopus subject areas

  • Pharmacology
  • Psychiatry and Mental health

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