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Related Experiment Videos

Ocular motor dysfunction in total and hemicerebellectomized monkeys

R M Burde, M H Stroud, G Roper-Hall

    The British Journal of Ophthalmology
    |October 1, 1975
    PubMed
    Summary

    Cerebellar dysfunction in monkeys caused loss of smooth pursuit eye movements and gaze-fixation nystagmus. The cerebellum also impacts vestibular responses and ipsilateral tone influencing eye movements.

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    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Cerebellar Function

    Background:

    • Ocular motor control is complex and relies on integrated brain function.
    • The cerebellum plays a crucial role in coordinating eye movements and maintaining gaze stability.

    Purpose of the Study:

    • To investigate the effects of cerebellar lesions on ocular motor function.
    • To elucidate the specific roles of the cerebellum in smooth pursuit, gaze fixation, and vestibular responses.

    Main Methods:

    • Monkeys underwent total or hemicerebellectomies.
    • Ocular motor function was assessed, including smooth pursuit, gaze fixation, and responses to caloric stimuli.

    Main Results:

    • Cerebellar lesions resulted in loss of smooth pursuit movements.

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  • Gaze-fixation nystagmus was observed following cerebellar damage.
  • Loss of inhibitory vestibular input was evidenced by decreased latency and prolonged responses to caloric stimuli.

    • Conclusions:

    • Cerebellar dysfunction significantly impairs ocular motor control.
    • The hemicerebellum appears to influence ipsilateral tone, which affects eye movements.