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Apomorphine pecking in the pigeon.

M Brunelli, F Magni, G Moruzzi

    Archives Italiennes De Biologie
    |December 1, 1975
    PubMed
    Summary

    Apomorphine-induced pecking in pigeons is a feeding behavior influenced by visual contrast and arousal. This behavior is absent in acute thalamic pigeons but recovers with chronic preparations.

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    Area of Science:

    • Neuroscience
    • Animal Behavior
    • Pharmacology

    Background:

    • Apomorphine elicits pecking behavior in intact pigeons, suggesting a role in feeding motivation.
    • The thalamus and reticular formation are implicated in modulating this behavior.

    Purpose of the Study:

    • To quantitatively investigate apomorphine-induced pecking in intact and thalamic pigeons.
    • To explore the influence of visual contrast, luminance, and arousal on this behavior.

    Main Methods:

    • Quantitative analysis of pecking activity in intact and thalamic pigeons under various conditions.
    • Assessment of apomorphine pecking in response to changes in visual contrast and luminance.
    • Evaluation of reticular stimulation effects on pecking behavior.

    Main Results:

    • Apomorphine pecking is absent in acute thalamic pigeons but reappears in chronic preparations.
    • Visual contrast acts as both a trigger and a target for apomorphine pecking.
    • Decreased luminance reduces pecking, likely due to decreased arousal.

    Conclusions:

    • Apomorphine stimulates hypothalamic feeding centers, motivating pecking behavior.
    • Visual contrast plays a critical dual role in triggering and guiding pecking.
    • Reduced arousal, influenced by light intensity, diminishes apomorphine-induced pecking.

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