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A method for determining precise electrical hearing thresholds in cochlear implant users.

Tobias Rader1,2, Philipp Doms1, Youssef Adel1

  • 1a Division of Audiological Acoustics, ENT Department , University Hospital Frankfurt , Frankfurt , Germany.

International Journal of Audiology
|February 3, 2018
PubMed
Summary
This summary is machine-generated.

A new psychoacoustic procedure precisely assesses cochlear implant (CI) users' perception thresholds, significantly improving speech understanding in quiet and noise. This method enhances dynamic range and speech scores, even with reduced T-levels.

Keywords:
Cochlear implantmedical audiologypsychoacoustics/hearing sciencespeech perception

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Area of Science:

  • Audiology
  • Psychoacoustics
  • Biomedical Engineering

Background:

  • Cochlear implants (CI) aim to restore hearing but precise fitting is crucial for optimal speech perception.
  • Accurate assessment of perception thresholds (T-levels) is vital for effective CI programming.
  • Current T-level assessment methods may not fully optimize speech processor settings.

Purpose of the Study:

  • To introduce and evaluate a novel psychoacoustic procedure for precise T-level determination in CI users.
  • To investigate the impact of this new procedure on speech perception in various conditions.
  • To compare speech perception outcomes using the new T-level procedure versus standard fitting methods.

Main Methods:

  • A prospective study involving 18 postlingually deafened adult CI users.
  • T-levels were measured using the proposed procedure and applied in three fitting conditions.
  • Speech perception and categorical loudness scaling (CLS) were assessed in quiet and noise.

Main Results:

  • The new procedure resulted in lower sound-field thresholds and a larger dynamic range.
  • Speech perception scores in quiet were significantly higher compared to the subject's usual fitting.
  • Speech perception in noise also improved significantly, even when T-levels were reduced by 10 clinical units (CU).

Conclusions:

  • Precise T-level determination using the proposed psychoacoustic procedure enhances speech recognition performance in CI users.
  • The method led to a median T-level increase of 9 CU compared to default settings.
  • A 1 dB decrease in average speech reception threshold in noise was observed for soft speech.