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Related Experiment Videos

Low intensity galvanic vestibulo-ocular reflex in normal subjects

G Quarck1, O Etard, H Normand

  • 1Laboratoire de Physiologie, Faculté de Médecine, Caen, France.

Neurophysiologie Clinique = Clinical Neurophysiology
|December 16, 1998
PubMed
Summary

Electrical stimulation of the vestibular system (EVOR) shows reproducible results for detecting bilateral vestibular issues. However, inconsistent directional responses limit its use for unilateral conditions.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Otolaryngology

Background:

  • Electrical stimulation between mastoids can differentiate vestibular lesions.
  • Reproducibility and symmetry are crucial for clinical application of vestibular evoked potentials.
  • Electrically evoked vestibulo-ocular reflex (EVOR) directly stimulates vestibular afferences.

Purpose of the Study:

  • To assess the symmetry and reproducibility of EVOR in healthy subjects.
  • To determine the clinical utility of low-intensity EVOR for diagnosing vestibular dysfunction.
  • To evaluate EVOR's potential in distinguishing labyrinthine from retrolabyrinthine lesions.

Main Methods:

  • Ten healthy subjects underwent two EVOR testing sessions one week apart.
  • A constant electrical stimulation of 2.5 mA was applied for 30 seconds between mastoids.

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  • Horizontal eye movements were recorded using infrared reflection eye-tracking in darkness.

    • Main Results:

    • Ocular responses showed a 20% higher slow-phase velocity and nystagmus frequency with the cathode on the right mastoid.
    • Significant individual differences in directional preponderance (DP) were observed between sessions.
    • High reproducibility (r ≈ 0.8) was found for the mean EVOR reflectivity (bilateral response).

    Conclusions:

    • Low-intensity EVOR's weak reproducibility of DP makes it unsuitable for unilateral vestibular hypofunction assessment.
    • The high reproducibility of reflectivity suggests EVOR is effective for detecting bilateral vestibular hypofunction.
    • The non-invasive nature and lack of anesthesia requirement facilitate repeated EVOR testing for chronic conditions.