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Related Experiment Video

Updated: Oct 20, 2025

Using Unidirectional Rotations to Improve Vestibular System Asymmetry in Patients with Vestibular Dysfunction
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Short-Latency Covert Saccades - The Explanation for Good Dynamic Visual Performance After Unilateral Vestibular Loss?

Julia Sjögren1, Mikael Karlberg1, Craig Hickson2

  • 1Department of Clinical Sciences, Otorhinolaryngology Head and Neck Surgery, Skåne University Hospital, Lund University, Lund, Sweden.

Frontiers in Neurology
|September 17, 2021
PubMed
Summary

Active head movements in patients with vestibular loss improve visual perception by reducing eye position errors. This is linked to quick, covert saccades that help stabilize vision during head turns.

Keywords:
compensationcovert saccadesfunctional head impulse testposition errorsaccadesvestibular lossvideo head impulse testvisual performance

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Vestibular System

Background:

  • The vestibulo-ocular reflex (VOR) is crucial for visual stability during head movements.
  • Previous research indicated active head movements to a lesioned side maintain visual performance comparable to the intact side.

Purpose of the Study:

  • To investigate differences in eye position during active versus passive head impulse tests.
  • To elucidate the role of saccade properties in enhancing visual performance in vestibular loss patients.

Main Methods:

  • Eight subjects with complete unilateral vestibular loss underwent video Head Impulse Test (vHIT) and Functional Head Impulse Test (fHIT).
  • Tests were conducted during both active and passive head movements while subjects fixated on a target.
  • Evaluated eye position error, saccade latency/velocity, and visual performance.

Main Results:

  • Active head impulses toward the lesioned side yielded visual performance equal to the intact side.
  • Active impulses significantly reduced eye position errors during visual tasks compared to passive impulses (p=0.006).
  • Reduced position error correlated with shorter saccade latencies (p<0.001).

Conclusions:

  • Active head impulses in unilateral vestibular loss patients minimize position error for brief visual perception.
  • This effect is attributed to short-latency covert saccades, optimizing eye position during head movements.