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Related Experiment Video

Updated: Jun 21, 2026

Using Unidirectional Rotations to Improve Vestibular System Asymmetry in Patients with Vestibular Dysfunction

Using Unidirectional Rotations to Improve Vestibular System Asymmetry in Patients with Vestibular Dysfunction

Published on: August 30, 2019

Posture control in vestibular-loss patients.

Thomas Mergner¹, Georg Schweigart, Luminous Fennell

¹Department of Neurology, University Clinics, University of Freiburg, Freiburg, Germany. mergner@uni-freiburg.de

Annals of the New York Academy of Sciences

|August 4, 2009

Summary

Patients with chronic vestibular loss struggle with balance, especially with eyes closed or on unstable surfaces. Their reliance on force cues for stance control is impaired, leading to falls and abnormal body sway.

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Area of Science:

Neuroscience
Biomechanics
Human Physiology

Background:

Chronic bilateral loss of vestibular function necessitates reliance on visual and haptic cues for stance control.
Patients with vestibular loss exhibit significant body sway and falls when visual cues are absent or support surfaces are unstable.
Postural responses in these patients depend on joint proprioception and ground reaction-force cues (somatosensory graviception).

Purpose of the Study:

To investigate why ground reaction-force cues cannot fully compensate for the loss of vestibular function in patients.
To understand the underlying mechanisms of impaired stance control in individuals with bilateral vestibular loss under specific experimental conditions.

Main Methods:

Analysis of patient data from four experimental situations demonstrating impaired stance control (unstable support, external disturbances, fast tilts, transient tilts).
Computational modeling of patient postural responses to identify the primary source of difficulties.
Formulation of a hypothesis regarding sensory information decomposition.

Main Results:

Patient postural control deficits were primarily attributed to difficulties with force cues.
Modeling revealed that patients struggle to decompose sensory information, specifically separating active force components.
This decomposition is essential for effective stance control, particularly under challenging sensory conditions.

Conclusions:

The vestibular system plays a crucial role in decomposing sensory information, a function that is impaired in patients with chronic vestibular loss.
Difficulties in decomposing force cues contribute significantly to the observed balance problems and increased fall risk in these patients.
Future research should focus on strategies to improve sensory information processing in individuals with vestibular dysfunction.