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The monkey vertical vestibuloocular response: a frequency domain study.

M J Correia, A A Perachio, A R Eden

    Journal of Neurophysiology
    |September 1, 1985
    PubMed
    Summary
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    Vision significantly improves the vertical vestibuloocular response (VVOR) in monkeys, reducing nonlinearities and enhancing gain and phase compensation. This study highlights vision

    Area of Science:

    • Neuroscience
    • Vestibular System
    • Oculomotor Function

    Background:

    • The vertical vestibuloocular reflex (VVOR) stabilizes gaze during head movements.
    • Understanding VVOR linearity and the influence of vision is crucial for vestibular research.

    Purpose of the Study:

    • To investigate the linearity of the VVOR in cynomolgus monkeys under different visual conditions.
    • To quantify the effect of vision on VVOR gain, phase, and nonlinearities.

    Main Methods:

    • Monkeys underwent sinusoidal rotations around the interaural axis with vision occluded (EOD) and with vision available (EOL).
    • Eye movements were recorded using the search coil method during oscillations at various frequencies and velocities.
    • Statistical analyses, including linearity tests and intensity function plots, were employed.

    Related Experiment Videos

    Main Results:

    • The VVOR exhibited minor nonlinearities (e.g., skewness up to 14%) with vision occluded, which disappeared when vision was present.
    • Intensity function plots demonstrated high linearity (correlation coefficient ≥ 0.99) across tested frequencies and velocities.
    • Vision significantly improved VVOR gain towards unity and phase compensation.

    Conclusions:

    • Vision plays a critical role in correcting VVOR nonlinearities and optimizing performance.
    • The VVOR is highly linear across a range of frequencies and velocities when vision is available.
    • These findings have implications for understanding gaze stabilization and vestibular compensation.