Perceptual response characterization in acute vestibular implant stimulation

Area of Science:

• Neuroscience
• Audiology
• Biomedical Engineering

Background:

• Bilateral vestibulopathy impairs self-motion perception and spatial navigation.
• Vestibular implants offer a potential treatment, but understanding electrical stimulation responses is crucial.

Purpose of the Study:

• To systematically examine perceptual responses to acute electrical vestibular stimulation in patients with vestibulocochlear implants.
• To characterize the relationship between stimulation parameters and perceived sensations.

Main Methods:

• Nine subjects with bilateral vestibulopathy received multichannel vestibulocochlear implants.
• Perceptual responses to stepwise electrical stimulation were assessed via open interviews.
• Stimulus intensity, electrode location, and perceived sensations were analyzed.

Main Results:

• Three primary perception types were identified: motion, auditory, and vibration.
• Motion perception aligned with the stimulated semicircular canal axis.
• Auditory perceptions varied in pitch with amplitude; vibration was consistently reported. Perceived intensity increased linearly with stimulation amplitude.

Conclusions:

• This study provides the first structural characterization of perceptual responses to electrical vestibular stimulation in implant users.
• Identified response types and their stimulus relationships form a basis for improving implant fitting and stimulation strategies.
• Future research should refine fitting based on these perceptual findings.