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Fitting hearing aids to individual loudness-perception measures

T A Ricketts1

  • 1Department of Speech Pathology and Audiology, University of Iowa, Iowa City, USA.

Ear and Hearing
|April 1, 1996
PubMed
Summary

Four hearing aid fitting strategies were compared for low-threshold compression instruments. The FIG6 and Desired Sensation Level Input/Output (DSLTM[i/o]) strategies predicted higher speech intelligibility (SII) than others, especially in noise.

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Area of Science:

  • Audiology
  • Hearing Instrument Science
  • Speech Communication

Background:

  • Traditional hearing aid fitting procedures may not adequately address the needs of low-threshold compression instruments.
  • New fitting strategies aim to provide more appropriate gain and compression settings for these devices.

Purpose of the Study:

  • To compare prescribed hearing aid parameters and predicted speech intelligibility (SII) across four novel fitting strategies and one traditional method.
  • To evaluate strategies for low-threshold compression hearing instruments.

Main Methods:

  • Electroacoustic prescriptions and predicted speech intelligibility (SII) were calculated for 20 subjects using five fitting strategies: DSLTM[i/o], VIOLA, FIG6, RAB, and NAL-R.
  • Threshold and loudness growth data were utilized for each fitting.

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Main Results:

  • The NAL-R strategy prescribed the least gain for low-level inputs and the most for high-level inputs.
  • Fitting by loudness (FBL) strategies requiring individual loudness growth measures (RAB, VIOLA) showed shallower frequency response slopes than those assuming average data (FIG6, DSLTM[i/o]).
  • FIG6 and DSLTM[i/o] predicted greater speech intelligibility (SII) compared to NAL-R, RAB, and VIOLA, particularly in noise.

Conclusions:

  • Differences in predicted speech intelligibility (SII) among fitting strategies may relate to output signal loudness and high-frequency shaping.
  • Individual loudness growth measures may not be necessary for clinical application.
  • Further research is needed to confirm if predicted SII differences translate to actual speech intelligibility and sound quality outcomes.