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Related Experiment Videos

Prehension in the pigeon. I. Descriptive analysis.

R Bermejo1, R W Allan, A D Houben

  • 1Biopsychology Program, Hunter College (CUNY), NY.

Experimental Brain Research
|January 1, 1989
PubMed
Summary

Pigeon jaw movements during eating show size-specific scaling for grasping and manipulating food. This research classifies these movements, offering insights into motor control for targeted actions.

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Area of Science:

  • Animal behavior
  • Neuroscience
  • Biomechanics

Background:

  • Pigeon eating involves complex jaw movements for grasping and manipulating food objects.
  • These prehensile behaviors are brief, controlled by few muscles, and subject to reflexive and voluntary control.
  • Pigeon jaw movements serve as a model system for studying motor control in targeted actions due to their simplicity and complexity.

Purpose of the Study:

  • To classify jaw opening movements during pigeon feeding.
  • To determine how jaw opening amplitude scales with food object size for each movement class.

Main Methods:

  • Monitoring pigeon jaw movements using a transducing system to record gape (interbeak distance).
  • Analyzing movements in response to spherical food pellets of varying sizes (3.2-11.1 mm).

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  • Utilizing a computer-assisted program for movement classification and scaling function determination.

    • Main Results:

    • Four jaw movement classes were identified: Prepecks, Grasps, Mandibulations, and Swallows.
    • Jaw opening amplitude scaled to pellet size in Grasps and Mandibulations.
    • The scaling functions for Grasps and Mandibulations differed, reflecting their distinct functional roles.

    Conclusions:

    • Pigeon jaw movements exhibit size-dependent adjustments crucial for effective feeding.
    • The study provides a framework for understanding motor control in targeted behaviors using a model system.
    • Differential scaling in Grasps and Mandibulations highlights functional specialization within the feeding motor system.