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Related Experiment Videos

Visual sensation during pecking in pigeons

J Ostheim1

  • 1University of Konstanz, FRG. Joachim.Ostheim@uni-konstanz.de

European Journal of Morphology
|September 18, 1997
PubMed
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Pigeon head-pecking uses visual feedback, not just pre-programmed actions. Eyelid slits adjust for focus and light, controlled by shared brain pathways sensitive to dopamine.

Area of Science:

  • Animal behavior
  • Neuroscience
  • Vision research

Background:

  • Pigeon head-pecking was assumed to be solely feed-forward controlled.
  • The gradual eye closure during head down-thrust was thought to block visual input.

Purpose of the Study:

  • To investigate the role of visual feedback in pigeon head-pecking.
  • To examine the function and control of eyelid slits during feeding.

Main Methods:

  • Analysis of high-resolution video recordings of pigeon feeding behavior.
  • Pharmacological manipulation targeting neuronal mechanisms controlling pupil and eyelid.
  • Observation of eyelid slit width in response to ambient light and visual background.

Main Results:

Related Experiment Videos

  • Visual information during head down-thrust modulates pecks in progress, indicating visual feedback.
  • Pigeon eyelids form a slit, not fully closing, leaving part of the pupil uncovered.
  • Eyelid slit width is sensitive to light and background, enhancing focal depth for near-field vision.
  • Pupil size and eyelid slit width share neuronal control mechanisms, sensitive to dopamine receptor drugs.

    • Conclusions:

    • Pigeon head-pecking involves both feed-forward and visual feedback control.
    • Eyelid slits serve a functional role in optimizing vision during near-field feeding.
    • Conjoint neuronal mechanisms, influenced by dopamine, regulate pupil and eyelid function.