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Estimating Nonorganic Hearing Thresholds Using Binaural Auditory Stimuli.

Linda W Norrix1, Vivian Rubiano1, Thomas Muller1

  • 1Department of Speech, Language, & Hearing Sciences, The University of Arizona, Tucson.

American Journal of Audiology
|September 16, 2017
PubMed
Summary

Minimum contralateral interference levels (MCILs) help estimate true hearing thresholds in cases of unilateral nonorganic hearing loss. Results show MCILs can be up to 19 dB poorer than true thresholds, influenced by individual response bias.

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Area of Science:

  • Audiology
  • Hearing Science
  • Psychoacoustics

Background:

  • Minimum contralateral interference levels (MCILs) are crucial for assessing true hearing thresholds in individuals with unilateral nonorganic hearing loss.
  • Understanding the accuracy of MCILs in predicting true hearing thresholds is essential for effective clinical diagnosis.

Purpose of the Study:

  • To determine MCILs in adults with normal hearing who feigned unilateral hearing loss.
  • To examine the correspondence between MCILs and true hearing thresholds to quantify the accuracy of this estimation procedure.

Main Methods:

  • Sixteen adults with normal hearing participated in the study.
  • Participants were instructed to simulate a unilateral hearing loss at 1.0, 2.0, and 4.0 kHz.
  • MCILs were measured, and participants made lateralization judgments with varying interaural intensity differences.

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Main Results:

  • The 90% confidence intervals indicated that MCILs were typically close to true thresholds or up to 17-19 dB poorer.
  • The proximity of MCIL to the true hearing threshold was found to be dependent on the individual's response criterion.
  • Response bias significantly influences MCIL values and their relationship to true hearing thresholds.

Conclusions:

  • Clinicians cannot ascertain a client's response bias, necessitating the use of confidence intervals for threshold prediction.
  • A 90% confidence interval should be employed to estimate the expected true threshold range.
  • Based on this approach, clinicians can infer that the true threshold is at or up to 19 dB better than the determined MCIL.