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Related Experiment Videos

Visual influence on head shaking using the vestibular autorotation test

B Cheung1, K Money, P Sarkar

  • 1Defence and Civil Institute of Environmental Medicine, North York, Ontario, Canada.

Journal of Vestibular Research : Equilibrium & Orientation
|November 1, 1996
PubMed
Summary
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The Vestibular Autorotation Test (VAT) shows potential for screening aircrew vestibular integrity. It recorded horizontal eye movements, with higher gain in the dark when fixating on imaginary targets.

Area of Science:

  • Neuroscience
  • Aerospace Medicine
  • Ophthalmology

Background:

  • The vestibular system is crucial for balance and spatial orientation.
  • Assessing vestibular integrity is vital for aircrew safety.
  • The Vestibular Autorotation Test (VAT) is a potential tool for evaluating vestibular function.

Purpose of the Study:

  • To investigate the efficacy of the VAT for assessing vestibular integrity in aircrews.
  • To record horizontal and vertical eye movements during voluntary head movements.
  • To analyze the gain and phase of vestibular responses.

Main Methods:

  • Subjects performed voluntary high-frequency head-only movements (0.5-6.0 Hz) using the VAT.
  • Eye movements were recorded using electrooculography.

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  • Head velocity was measured with calibrated rotational velocity sensors.
  • Discrete Fourier analysis computed signal gain and phase.
  • Tests were conducted under various light conditions (light and dark) and fixation targets (real and imaginary).

    • Main Results:

    • Consistent vertical vestibulo-ocular reflex (VOR) responses were not obtained.
    • Horizontal eye movement gain significantly increased in the dark when fixating on an imaginary target compared to light conditions.
    • In dark conditions, gain was significantly higher with imaginary target fixation versus real target fixation.
    • No significant differences in phase were observed across conditions.

    Conclusions:

    • The VAT shows promise as a non-invasive, short-duration screening test for vestibular integrity in aircrews.
    • Further research and extensive normative data are required for validation.
    • Careful control of variables is necessary for accurate assessment.