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Related Experiment Videos

Reinforcer concentration effects on a fixed-interval schedule.

Frances J Blomeley1, C F Lowe, J H Wearden

  • 1University of Wales, Bangor, UK.

Behavioural Processes
|June 9, 2004
PubMed
Summary
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Higher condensed milk concentrations delayed rat responding and shifted peak response times on a fixed-interval schedule. This study explores timing behavior and reinforcement effects in rats.

Area of Science:

  • Behavioral neuroscience
  • Animal behavior and cognition
  • Psychology

Background:

  • Understanding interval timing is crucial in behavioral science.
  • Reinforcement value can influence temporal control of behavior.
  • Previous models of timing do not fully account for reinforcement effects.

Purpose of the Study:

  • To investigate how variations in reinforcer concentration affect interval timing in rats.
  • To examine the impact of different fixed-interval (FI) schedules on response patterns.
  • To test predictions from Scalar Expectancy Theory, the Behavioural Theory of Timing, and the Tuned-trace model.

Main Methods:

  • Four rats were trained on a mixed fixed-interval (FI) 30-s and FI 150-s schedule, with levers associated with different intervals.

Related Experiment Videos

  • Reinforcer concentration (condensed milk) was varied (10%, 30%, 50%, 70%) during testing.
  • Behavioral measures, including response initiation and peak response location, were recorded from the FI 30-s lever.

    • Main Results:

    • Increased reinforcer concentration significantly lengthened the time to initiate responding within an interval.
    • Higher concentrations shifted the peak response location on the FI 30-s lever, often beyond the programmed 30-s interval.
    • Peak response rate and the spread of the response rate function showed minimal changes with varying concentrations.

    Conclusions:

    • Reinforcer concentration plays a significant role in modulating interval timing, affecting response initiation and temporal accuracy.
    • Findings challenge some assumptions of current timing theories regarding the influence of reinforcement magnitude.
    • Further research is needed to refine timing models to incorporate the effects of reinforcement value.