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Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process
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S Haumann1, G Bauernfeind, M J Teschner

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This study explored implanting epidural electrodes for brain signal control in cochlear implant (CI) users. Epidural recordings demonstrated superior signal quality for auditory evoked potentials (AEPs), enhancing CI system applicability.

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Audiology

Background:

  • Brain-computer interfaces (BCIs) aim for device control via neural signals.
  • Auditory evoked potentials (AEPs) are suitable for BCIs, but non-invasive methods have limitations.
  • Implantable electrodes, ideally integrated into cochlear implants (CIs), offer potential for higher signal quality and reduced artifacts.

Purpose of the Study:

  • To investigate the feasibility of temporarily implanting epidural electrodes during CI surgery.
  • To assess the ability to record AEPs using these electrodes over several days.
  • To compare invasive epidural recordings with non-invasive scalp recordings for CI applications.

Main Methods:

  • Temporarily implanted epidural electrodes during cochlear implant surgery.
  • Recorded intraoperative auditory brainstem responses and postoperative AEPs.
  • Compared epidural recordings with clinical standard surface electrode recordings.

Main Results:

  • Epidural electrodes yielded clearer N1 waves in cortical evoked response audiometry, even at lower stimulation intensities.
  • Signal quality was significantly better with epidural electrodes compared to scalp electrodes, with fewer artifacts.
  • Objective quality measures confirmed superior signal quality from epidural recordings.

Conclusions:

  • Temporary epidural electrode implantation is feasible and well-tolerated in CI patients.
  • Epidural recordings provide significantly better signal quality for AEPs than scalp recordings.
  • Integrating epidural electrodes into future CI systems could enhance auditory closed-loop applications for CI users.