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Fully objective hearing threshold estimation in cochlear implant users using phase-locking value growth functions.

Darren Mao1, Hamish Innes-Brown2, Matthew A Petoe2

  • 1Department of Biomedical Engineering, University of Melbourne, Parkville, VIC, 3010, Australia; The Bionics Institute, 384-388 Albert St, East Melbourne, VIC, 3002, Australia.

Hearing Research
|March 19, 2019
PubMed
Summary
This summary is machine-generated.

An objective method using cortical auditory evoked responses (CAEPs) accurately estimates cochlear implant (CI) threshold levels. This approach offers a viable alternative for optimizing sound access in CI users.

Keywords:
Cochlear implantCortical responseEEGElectrical dynamic rangeObjective threshold estimationPhase-locking value

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Area of Science:

  • Auditory Neuroscience
  • Biomedical Engineering
  • Clinical Audiology

Background:

  • Cochlear implant (CI) users require precise fitting of electrical hearing thresholds and comfort levels for optimal sound perception.
  • Current fitting procedures often rely on subjective behavioral responses, which can be challenging for some individuals.

Purpose of the Study:

  • To develop and validate an objective method for estimating electrical threshold levels in CI users using cortical auditory evoked responses (CAEPs).
  • To investigate the efficacy of different electrode montages for CAEP acquisition and compare objective estimates with behavioral thresholds.
  • To explore an objective method for estimating comfort levels in CI users.

Main Methods:

  • Cortical auditory evoked responses (CAEPs) were recorded from 20 Nucleus CI users using a single-channel setup.
  • An objective method was developed utilizing growth function fitting and the peak phase-locking value feature to estimate threshold levels.
  • CAEPs were acquired using both a standard Cz-to-mastoid montage and a montage simulating near-implant recording.

Main Results:

  • The objective method demonstrated a strong correlation (r=0.979, p<0.001) between estimated and behavioral threshold levels.
  • Near-implant recording showed a similarly strong correlation (r=0.966, p<0.001) but required longer recording times for comparable accuracy.
  • Objective comfort level estimation showed a mild correlation (r=0.50, p=0.024) with behavioral comfort levels.

Conclusions:

  • Growth function fitting of CAEPs provides a viable and accurate objective method for estimating threshold levels in cochlear implant users.
  • Objective threshold estimation is feasible with both standard and near-implant electrode configurations, with trade-offs in recording time.
  • Further research is needed to refine objective comfort level estimation techniques for cochlear implant fitting.