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Related Experiment Videos

Delay reduction and optimal foraging: variable-ratio search in a foraging analogue

W A Williams1, E Fantino

  • 1Department of Psychology, University of California, San Diego, La Jolla 92093-0109.

Journal of the Experimental Analysis of Behavior
|May 1, 1994
PubMed
Summary

This study found pigeons preferred smaller, sooner rewards when foraging choices conflicted. Delay-reduction theory accurately predicted behavior, unlike simple rate maximization.

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Area of Science:

  • Behavioral science
  • Animal behavior
  • Comparative psychology

Background:

  • Conditioned reinforcement principles guide foraging behavior.
  • Delay-reduction theory and rate-maximization theory offer competing explanations.
  • Previous research has not fully explored these competing predictions in foraging contexts.

Purpose of the Study:

  • To investigate conditions where delay-reduction theory and rate-maximization theory make opposing predictions for foraging choice behavior.
  • To extend delay-reduction theory to variable-ratio schedules, mimicking search effort.
  • To compare the predictive power of both theories under specific choice conditions.

Main Methods:

  • Pigeons were trained on modified concurrent-chains schedules.
  • Equal variable-ratio schedules led to unequal variable-interval outcomes and reinforcer amounts.

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  • Replicated conditions where delay-reduction and rate-maximization predictions diverged.

    • Main Results:

    • In 11 out of 11 replications, results supported delay-reduction theory's predictions.
    • Pigeons consistently favored the smaller, more immediate alternative when predictions opposed.
    • Rate-maximization predictions were only supported when they aligned with delay-reduction predictions.

    Conclusions:

    • Findings support delay-reduction theory in explaining foraging-related choice behavior.
    • Sensitivity to reductions in delay to reinforcement is a key factor.
    • Results inform our understanding of conditioned reinforcement and foraging strategies.