A Biophysical Model for Simultaneous Cochlear and Vestibular Nerve Stimulation: Insights into Neural Activation and Crosstalk in Inner Ear Implants

Simultaneous hearing and balance restoration through combined cochlear-vestibular implants (CVIs) offers a promising treatment for patients with dual sensory deficits. However, the effects of electrical stimulation on neighboring neural structures in the inner ear remain poorly understood.

No actionable change to current practice; findings are from a biophysical simulation model and have not yet been validated in human or animal implant studies.

As combined cochlear-vestibular implants move toward clinical reality, understanding electrical crosstalk between the cochlear and vestibular nerves is essential for designing stimulation strategies that preserve both hearing and balance outcomes.

1. 01Biophysical computer model simulated simultaneous cochlear and vestibular nerve stimulation in a combined inner-ear implant.
2. 02Electrical 'crosstalk' — signals leaking between the two nerve systems — was identified as a meaningful risk during dual stimulation.
3. 03Findings suggest stimulation parameters may need to be carefully tuned to minimise unintended activation of the wrong nerve.
4. 04Study addresses a gap in understanding for patients with both hearing loss and vestibular (balance) dysfunction needing dual implants.
5. 05Results are model-based and require experimental and clinical validation before influencing implant design or programming protocols.

PMID

42498869

DOI

10.1007/s10162-026-01065-9.

Journal

JARO – Journal of the Association for Research in Otolaryngology

Publication type

research_article

Evidence level

na

Population

Computational/biophysical model of inner ear neural anatomy; no human or animal subjects

Intervention

Simultaneous electrical stimulation of cochlear and vestibular nerves via a combined implant (modelled)