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Related Experiment Videos

Head-shaking nystagmus depends on gravity.

Antonella Palla1, Sarah Marti, Dominik Straumann

  • 1Neurology Department, Zurich University Hospital, CH-8091, Zurich, Switzerland. antpalla@access.unizh.ch

Journal of the Association for Research in Otolaryngology : JARO
|March 1, 2005
PubMed
Summary

Head-shaking nystagmus (HSN) in patients with vestibular deficits is gravity-dependent. Lying on the affected ear intensifies HSN, suggesting impaired otolith function influences this vestibular response.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Vestibular System Research

Background:

  • Acute unilateral peripheral vestibular deficit causes spontaneous nystagmus (SN) that worsens when lying on the affected ear.
  • This phenomenon suggests reduced otolith function on the affected side, which normally suppresses semicircular canal signals.

Purpose of the Study:

  • To investigate if head-shaking nystagmus (HSN) in chronic unilateral vestibular deficit patients is influenced by gravity.
  • To compare the gravitational influence on HSN with that observed for SN in acute vestibular deficit patients.

Main Methods:

  • Seven patients with chronic unilateral vestibular deficit post-vestibular neuritis participated.
  • A three-dimensional (3-D) turntable was used to position patients in various roll plane orientations.

Related Experiment Videos

  • Patients underwent head oscillations (1 Hz, +/-10 degrees) about their head-fixed vertical axis, with eye movements recorded via 3-D magnetic search coils.

    • Main Results:

    • Head-shaking nystagmus (HSN) showed significant modulation by gravity.
    • When patients lay on their affected ear, slow-phase eye velocity of HSN increased significantly.
    • This increase manifested as a horizontal drift toward the affected ear, indicating a gravity-dependent mechanism.

    Conclusions:

    • Head-shaking nystagmus (HSN) in chronic unilateral peripheral vestibular deficit is most effectively elicited when patients lie on their affected ear.
    • This finding suggests a gravity-dependent mechanism, similar to spontaneous nystagmus (SN) in acute cases.
    • The results imply that unilaterally impaired otolith organs contribute to asymmetric suppression of vestibular nystagmus.