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Hyperstriatal function in the pigeon: response inhibition or response shift?

E M Macphail

    Journal of Comparative and Physiological Psychology
    |August 1, 1975
    PubMed
    Summary
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    Pigeons with hyperstriatum lesions struggle with learning and reversing tasks. This suggests a deficit in shifting responses after nonreinforcement, not a loss of response inhibition.

    Area of Science:

    • Neuroscience
    • Animal Behavior
    • Cognitive Science

    Background:

    • The hyperstriatum is a brain region implicated in learning and decision-making in birds.
    • Previous research suggested lesions in this area might impair response inhibition.

    Purpose of the Study:

    • To investigate the role of the hyperstriatum in learning and reversal tasks in pigeons.
    • To differentiate between a deficit in response inhibition versus a deficit in shifting attention due to nonreinforcement.

    Main Methods:

    • Experiment 1: Pigeons with anterior or posterior hyperstriatum lesions, and control groups (unoperated, neostriatal lesions), underwent simultaneous position discrimination acquisition and reversal.
    • Experiment 2: Further tested hyperstriatal pigeons to assess their ability to shift responding following nonreinforcement.

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    Main Results:

    • Hyperstriatum-lesioned pigeons were impaired in both acquisition and reversal compared to controls.
    • These birds showed a greater tendency to cease responding altogether, challenging the response inhibition hypothesis.
    • Results supported the hypothesis that hyperstriatum lesions impair the ability to shift responses after nonreinforcement.

    Conclusions:

    • The hyperstriatum is crucial for both initial learning and flexible behavioral adjustment in pigeons.
    • The observed deficits are better explained by impaired attentional shifting following nonreinforcement rather than a failure of response inhibition.