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Related Experiment Videos

Choice between fixed and variable delays with different reward amounts

D Brunner1, J Gibbon, S Fairhurst

  • 1New York State Psychiatric Institute, New York 10032.

Journal of Experimental Psychology. Animal Behavior Processes
|October 1, 1994
PubMed
Summary
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Pigeons chose between food sources based on average reinforcement rates. However, they also remembered individual delay-amount combinations separately, indicating complex decision-making.

Area of Science:

  • Behavioral neuroscience
  • Animal cognition
  • Operant conditioning

Background:

  • Understanding choice behavior is crucial for behavioral economics and neuroscience.
  • Pigeons (Columba livia) are widely used models for studying decision-making under uncertainty.

Purpose of the Study:

  • To investigate how pigeons choose between variable and fixed food sources.
  • To determine if pigeons average reinforcement rates or consider individual delay-amount combinations.

Main Methods:

  • Pigeons were presented with a choice between a variable food source and a fixed food source.
  • The variable source offered different food access durations with equiprobable delays (20s or 60s).
  • A time-left procedure was used for the fixed alternative with a 60s delay.

Related Experiment Videos

Main Results:

  • Pigeon preference was accurately predicted by averaging the local rates of reinforcement from the variable alternative.
  • Initial choice link data supported the averaging rule.
  • Terminal link responding revealed that pigeons separately recalled the two delay-amount combinations.

Conclusions:

  • Pigeons employ an averaging strategy for initial choices between variable reinforcement schedules.
  • Memory for specific delay-amount pairings influences terminal link behavior, suggesting a more nuanced decision process than simple averaging.