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Avian vestibuloocular reflex: adaptive plasticity and developmental changes

J Wallman, J Velez, B Weinstein

    Journal of Neurophysiology
    |October 1, 1982
    PubMed
    Summary
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    The vestibuloocular reflex (VOR) in chickens shows significant plasticity, adapting to visual and vestibular stimuli. Both young and adult chickens exhibit VOR gain changes, indicating robust adaptive mechanisms.

    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Vestibular System Research

    Background:

    • The vestibuloocular reflex (VOR) stabilizes gaze during head movements.
    • Understanding VOR plasticity is crucial for addressing visual-vestibular disorders.
    • Comparative studies across species and developmental stages are limited.

    Purpose of the Study:

    • To investigate the plasticity of the vestibuloocular reflex (VOR) in chickens.
    • To compare VOR plasticity between newly hatched and older chickens.
    • To compare chicken VOR plasticity with that of other species.

    Main Methods:

    • Chickens (newly hatched and older) were exposed to visual and vestibular stimuli.
    • Stimuli simulated either a low-gain or reversed-phase VOR.

    Related Experiment Videos

  • Changes in VOR gain and phase were measured after 2 hours of exposure.
  • Main Results:

    • Both young and adult chickens demonstrated substantial VOR gain increases after 2 hours of normal retinal slip.
    • Reversed retinal slip induced VOR gain decreases and phase reversals.
    • Newly hatched chicks showed larger gain increases, while older birds showed larger phase changes.

    Conclusions:

    • Chicken VOR exhibits significant plasticity, comparable to mammals but with frequency-dependent phase shifts.
    • Age does not appear to be a primary factor in VOR plasticity differences.
    • Species-specific error signals may govern VOR adaptive adjustments, differing from rabbits.