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Human ocular counterrolling induced by varying linear accelerations

B K Lichtenberg, L R Young, A P Arrott

    Experimental Brain Research
    |January 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

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    This study measured ocular counterrolling (OCR) using linear acceleration for the first time. Results show OCR eye movements consistent with static studies, revealing insights into the otolith-ocular reflex dynamics.

    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Vestibular System

    Background:

    • Ocular counterrolling (OCR) traditionally studied via static head tilt or rotational stimuli.
    • Previous research focused on static or continuous rotation, not dynamic linear acceleration.

    Purpose of the Study:

    • To measure ocular counterrolling (OCR) in humans induced by linear accelerations.
    • To characterize the dynamics of the otolith-ocular reflex under linear acceleration.

    Main Methods:

    • Dynamic measurements of OCR using lateral linear acceleration.
    • Sinusoidal oscillation at 0.2, 0.4, and 1.0 Hz with 0.2 g peak acceleration.

    Main Results:

    • OCR eye movements measured at approximately 2 degrees for 0.2 g peak acceleration (0.2 Hz).

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  • Response dynamics align with a low-order linear system, showing a dominant time constant of 0.33 s.
  • Observed good agreement with a previous model regarding gain and phase for sinusoidal oscillations.

    • Conclusions:

    • The otolith-ocular reflex exhibits dynamics consistent with previous models under linear acceleration.
    • The reflex appears statistically stationary over short durations.
    • Further investigation is needed to determine amplitude linearity.