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Quantifying postural responses to galvanic vestibular stimulation for a four-electrode montage
Gaurav N Pradhan1,2,3, Sarah E Kingsbury4,5, Jan Stepanek5,6,7
1Department of Otolaryngology- Head and Neck Surgery, Division of Audiology, Mayo Clinic, Scottsdale, AZ, USA. pradhan.gaurav@mayo.edu.
Experimental Brain Research
|July 31, 2026
Summary
Galvanic vestibular stimulation (GVS) using a novel four-electrode setup significantly impacts standing balance. This research quantifies postural changes, aiding safe GVS application in rehabilitation and virtual reality.
Area of Science:
- Neuroscience
- Biomechanics
- Human Physiology
Background:
- Standing balance relies on integrating proprioceptive, visual, and vestibular inputs.
- Galvanic vestibular stimulation (GVS) impacts postural stability, with most research on simple, two-electrode setups.
- Limited data exists on balance effects from multiaxial GVS using multiple electrodes.
Purpose of the Study:
- To quantitatively characterize postural responses to a novel four-electrode Galvanic vestibular stimulation (GVS) montage.
- To investigate the effects of multiaxial GVS on standing balance metrics in healthy individuals.
- To establish a foundation for predicting body motion during complex GVS applications.
Main Methods:
- Healthy participants stood with eyes closed on a dual force-plate system.
- Six randomized GVS conditions were applied using four electrodes (mastoids, forehead, neck).
- Center-of-pressure (COP) dynamics were analyzed for static, dynamic sway, and velocity measures.
Main Results:
- All GVS conditions significantly altered balance measures compared to no stimulation (Null).
- GVS increased COP displacement, sway area, and peak velocities.
- GVS reduced sway density and altered mediolateral (ML) and anteroposterior (AP) sway characteristics.
Conclusions:
- This study provides the first quantitative analysis of postural control under an unconventional, multiaxial GVS montage.
- Findings highlight GVS's significant impact on standing balance, necessitating careful application.
- Results are crucial for safe GVS use in clinical vestibular rehabilitation and immersive virtual environments.
