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Related Experiment Videos

Early experiential effects on laterality: research on chicks has relevance to other species.

L J Rogers1

  • 1Division of Neuroscience and Animal Behavior, School of Biological Sciences, University of New England, Armidale, NSW 2351, Australia. lrogers@metz.une.edu.au

Laterality
|January 1, 1997
PubMed
Summary

Early light exposure influences brain lateralization in male chicks, enabling visual-guided pecking. Female chicks and dark-incubated males show no such lateralization, suggesting sex-specific developmental pathways.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Ethology

Background:

  • Hemispheric lateralization of function is observed across many species.
  • In chicks, visual system asymmetries correlate with lateralized behaviors.
  • Early environmental factors can influence the development of brain lateralization.

Purpose of the Study:

  • To investigate the impact of early light exposure on the development of lateralization in chick visual-guided pecking behavior.
  • To determine sex differences in the influence of light on lateralization.
  • To explore the sensitive period for light's effect and hormonal influences.

Main Methods:

  • Utilized the chick (Gallus gallus domesticus) as a model organism.
  • Assessed pecking behavior (grain vs. pebbles) under monocular and binocular conditions.

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  • Manipulated light exposure during the final days of incubation and analyzed sex-specific responses.

    • Main Results:

    • Light-exposed males showed lateralized pecking (right eye/left hemisphere advantage), unlike dark-incubated males or all females.
    • Females and dark-incubated males exhibited random pecking regardless of eye used.
    • A sensitive period for light's influence was identified, and sex hormone effects were discussed.

    Conclusions:

    • Early light exposure is crucial for establishing visual-guided pecking lateralization in male chicks.
    • This lateralization is dependent on light occlusion of the left eye during incubation.
    • Females appear to be insensitive to this light-induced lateralization, highlighting sex-specific developmental trajectories.