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Related Experiment Videos

Small and large fixed ratios with the same unit price.

James B Smith1, Andrew W Gantert

  • 1Mercer University, School of Pharmacy, Atlanta, GA 30341, USA.jbsmith@mindspring.com

Behavioural Processes
|March 5, 2004
PubMed
Summary
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Rats preferred smaller fixed ratio (FR) schedules when reinforcer timing was closer, even when larger FR schedules offered the same total food or sucrose rewards. This suggests temporal proximity influences reinforcement choice.

Area of Science:

  • Behavioral neuroscience
  • Animal behavior studies
  • Operant conditioning research

Background:

  • Operant conditioning principles explain how consequences shape behavior.
  • Fixed Ratio (FR) schedules are crucial for understanding reinforcement patterns.
  • Rats are commonly used models for studying learning and decision-making.

Purpose of the Study:

  • To investigate how fixed ratio (FR) requirements and unit prices affect key pressing behavior in rats.
  • To determine the influence of reinforcer proximity on choice behavior under different schedules.
  • To analyze the elasticity of demand for reinforcers based on FR schedules and unit prices.

Main Methods:

  • Rats were trained on multiple and discrete-trial choice schedules using food pellets or sucrose solution as reinforcers.

Related Experiment Videos

  • Fixed Ratio (FR) requirements varied from 20 to 1560, with unit prices ranging from 20 to 240.
  • Demand elasticity was assessed by comparing responding under different FRs and unit prices, including supplemental feeding conditions.

    • Main Results:

    • Response rates were maintained across wide FR ranges at lower unit prices but declined at higher prices.
    • Demand for food was inelastic at lower FRs (20-120) and elastic at higher FRs (>240).
    • In choice procedures, rats preferred smaller FRs over larger ones (up to 480) when unit price was constant, switching away from FRs of 600 or greater.

    Conclusions:

    • Reinforcer proximity, not just the aggregate number of reinforcers or unit price, significantly influences choice behavior.
    • Behavior under FR schedules is sensitive to both the magnitude and temporal distribution of reinforcement.
    • Findings highlight the importance of temporal factors in understanding operant choice and reinforcement schedules.