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Related Experiment Videos

Categorical shape and color coding by pigeons.

T R Zentall, P Jackson-Smith, J A Jagielo

    Journal of Experimental Psychology. Animal Behavior Processes
    |April 1, 1986
    PubMed
    Summary
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    Pigeons demonstrate categorical coding for shapes and colors. This study reveals pigeons can form abstract rules for visual stimuli, suggesting hierarchical color categories.

    Area of Science:

    • Animal Cognition
    • Behavioral Neuroscience
    • Comparative Psychology

    Background:

    • Categorical coding involves responding similarly to distinct stimuli.
    • Previous research shows pigeons categorize colors into spectral regions.
    • The current study investigates shape categorization and higher-order color categories in pigeons.

    Purpose of the Study:

    • To assess categorical coding of shapes in pigeons.
    • To investigate the existence of a higher-order color category ('all colors').
    • To determine if pigeons develop abstract rules for visual stimuli.

    Main Methods:

    • Pigeons were trained on two independent tasks: matching-to-sample and oddity-from-sample.
    • Tasks involved specific shapes (plus sign, circle) and colors (red, green).

    Related Experiment Videos

  • Test trials involved interchanging stimuli between tasks to observe differential responding.

    • Main Results:

    • Evidence for categorical coding of sample shapes was observed.
    • Categorical color coding was found in comparison stimuli, not sample stimuli.
    • Experiment 2 confirmed categorical shape coding and ruled out specific color effects.

    Conclusions:

    • Pigeons can develop categorical rules encompassing both shapes and colors.
    • Color categories in pigeons may exhibit hierarchical structures.
    • Findings contribute to understanding abstract rule learning and stimulus generalization in avian cognition.