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Related Experiment Videos

Glissadic overshoots are due to pulse width errors.

A T Bahill, F K Hsu, L Stark

    Archives of Neurology
    |March 1, 1978
    PubMed
    Summary
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    Glissades, slow eye movements, are linked to errors in the duration, not height, of neural signals controlling eye muscles. This finding offers new insights into the central nervous system's motor control precision.

    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Motor Control

    Background:

    • Glissades are slow, gliding eye movements following saccades.
    • They are clinically significant in diagnosing neurological disorders like multiple sclerosis and vascular lesions.
    • Glissades arise from a mismatch in the pulse-step motoneuronal control signals.

    Purpose of the Study:

    • To investigate the underlying cause of glissadic overshoot.
    • To determine whether pulse height or pulse width errors in motoneuronal signals cause glissades.
    • To elucidate the precision of the central nervous system in controlling motoneuron firing characteristics.

    Main Methods:

    • A combined physiological and computational simulation study.
    • Analysis of pulse-step motoneuronal controller signals during eye movements.

    Related Experiment Videos

  • Comparison of glissadic responses attributed to pulse width versus pulse height errors.

    • Main Results:

    • Glissadic overshoot is demonstrated to be caused by errors in pulse width.
    • Pulse height errors were not found to be the cause of glissadic overshoot.
    • The study highlights a differential precision in CNS control over motoneuron firing frequency and burst duration.

    Conclusions:

    • The central nervous system exhibits greater precision in controlling motoneuron firing frequency and recruitment than in regulating the duration of saccadic bursts.
    • Understanding the cause of glissades provides insights into the mechanisms of eye movement control.
    • This research refines our understanding of the neural basis of saccadic eye movements and their associated phenomena.