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Related Experiment Videos

Processing of empty and filled time intervals in pigeons.

Douglas S Grant1, Diane C Talarico

  • 1Department of Psychology, University of Alberta, Edmonton, Alberta, Canada. douglas.grant@ualberta.ca

Learning & Behavior
|April 14, 2005
PubMed
Summary

Pigeons trained with empty time intervals learned to prefer longer durations. Initial training with empty intervals, but not filled ones, influenced how pigeons perceived filled interval durations.

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Area of Science:

  • Animal cognition
  • Behavioral neuroscience
  • Temporal perception

Background:

  • Understanding how animals process temporal information is crucial for cognitive science.
  • Previous research has explored interval timing in various species, but the impact of training modality (empty vs. filled intervals) remains less understood.

Purpose of the Study:

  • To investigate the effect of initial training with empty versus filled temporal intervals on pigeons' subsequent time perception.
  • To determine if prior experience with one type of interval influences the processing of the other type.

Main Methods:

  • Pigeons were trained on 2- and 8-second empty or filled intervals, signaled by start and stop markers.
  • Psychophysical tests were conducted after initial training, followed by training with the alternative interval type and repeat testing.

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  • Behavioral responses, specifically a 'choose-long' or 'choose-short' effect, were analyzed.

    • Main Results:

    • Pigeons initially trained with empty intervals showed a 'choose-long' effect for both empty and filled intervals.
    • Pigeons initially trained with filled intervals showed a weak 'choose-short' effect for filled intervals and a strong 'choose-long' effect for empty intervals.
    • Both groups tended to include the duration of interval markers in their timing, particularly on filled-interval trials.

    Conclusions:

    • Initial training with empty temporal intervals significantly alters pigeons' temporal information processing, even for subsequent filled intervals.
    • Initial training with filled intervals has a limited impact on the processing of empty temporal intervals.
    • The findings highlight the asymmetric influence of training modality on temporal perception in pigeons.