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A delay-specific differential outcomes effect in delayed matching to sample.

K Geoffrey White1, Rebecca J Sargisson

  • 1Department of Psychology, University of Otago, Dunedin, New Zealand, geoff.white@otago.ac.nz.

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|March 19, 2015
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Summary
This summary is machine-generated.

Researchers demonstrated a delay-specific differential outcomes effect (DOE) in pigeons. Accuracy improved at specific delays when rewards differed, supporting theories on reward expectancies in memory tasks.

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Area of Science:

  • Cognitive Psychology
  • Animal Behavior
  • Learning and Memory

Background:

  • Delay-specific remembering shows enhanced accuracy at certain retention intervals.
  • The differential outcomes effect (DOE) improves accuracy across all delays with varied rewards.
  • Existing DOE theories link effects to reward expectancies influencing stimulus control.

Purpose of the Study:

  • To investigate a delay-specific differential outcomes effect (DOE).
  • To test if differential outcomes at specific delays, and same outcomes at others, enhance accuracy selectively.
  • To examine implications for theories attributing DOE to reward expectancies.

Main Methods:

  • Four pigeons performed delayed matching-to-sample tasks with mixed within-session delays (e.g., 0.5, 5, 15 s).
  • Differential reward durations (differential outcomes) were provided for correct choices at some delays.
  • Same reward durations (same outcomes) were provided at other delays within the same session.

Main Results:

  • Evidence of a delay-specific DOE was observed, with improved accuracy at delays featuring differential outcomes.
  • Accuracy was higher when differential outcomes were used compared to when same outcomes were used.
  • A standard DOE was confirmed in a separate experiment comparing all-same vs. all-differential outcomes.

Conclusions:

  • The findings support the existence of a delay-specific differential outcomes effect.
  • Results suggest that reward expectancies may exert influence selectively at specific delays.
  • This provides valuable insights into the mechanisms underlying memory and decision-making under delayed reward conditions.