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Influence of tonotopic cochlear stimulation on subjective visual vertical - a pilot study
M Goncalves1, L Francois, F Christov
1Department of Otorhinolaryngology, Head and Neck Surgery, RWTH Aachen University, Aachen, Germany. mgoncalves@ukaachen.de.
Tonotopic stimulation via cochlear implants (CI) did not significantly alter the Subjective Visual Vertical (SVV). Future research should explore novel CI stimulation strategies to influence otolith organ function.
Area of Science:
- Neuroscience
- Audiology
- Vestibular System
Background:
- Cochlear Implants (CI) restore hearing in sensorineural hearing loss.
- Vestibular system interaction with CI stimulation is not fully understood.
- Subjective Visual Vertical (SVV) assesses otolith organ function.
Purpose of the Study:
- Evaluate the impact of tonotopic CI stimulation on SVV.
- Investigate basal electrode stimulation effects in unilateral CI users.
Main Methods:
- Pilot study included 10 adult unilateral CI users (Advanced Bionics).
- Tested five stimulation modes: basal, medial, apical, all on, all off.
- SVV measured with goggles in upright and head-tilted positions.
Main Results:
- Significant SVV changes occurred with head tilt across all stimulation modes.
- No significant differences in SVV were found between the five CI stimulation settings.
- No significant differences in SVV deviation direction based on the operated ear.
Conclusions:
- Tonotopic CI stimulation does not influence SVV.
- Novel stimulation strategies beyond auditory processing are needed for otolith organ stimulation.
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