Development of a conversion model between mechanical and electrical vestibular stimuli

Area of Science:

• Neuroscience
• Biomedical Engineering
• Vestibular System Research

Background:

• The vestibular system is crucial for self-motion perception.
• Electrical vestibular stimulation (EVS) is increasingly popular but lacks a direct link to mechanical stimuli.
• A model is needed to bridge the gap between mechanical and electrical vestibular activation.

Purpose of the Study:

• To develop and test a mechanical-to-electrical vestibular stimulus conversion model.
• To compare ocular torsional and perceptual responses between mechanical and electrical vestibular stimulation.
• To establish a framework for generating mechanically equivalent EVS.

Main Methods:

• Compared ocular torsional responses to mechanical (chair rotation) and model-derived electrical stimuli.
• Used angular velocity step changes and multisine stimuli.
• Evaluated perception of whole-body rotation to step-change stimuli.

Main Results:

• Ocular torsional slow-phase velocity responses were similar and correlated between stimulation types.
• Perceptual decay dynamics also showed similarity between mechanical and electrical stimuli.
• The model demonstrated a conversion factor of ~0.4 mA per deg/s for step changes.

Conclusions:

• Central processing of vestibular information is similar for both mechanical and electrical stimuli.
• The developed model can generate electrical stimuli that replicate mechanical vestibular activation.
• This work provides a foundation for using EVS in biomedical and immersive reality applications.