Estimating Nonorganic Hearing Thresholds Using Binaural Auditory Stimuli Purpose Minimum contralateral interference levels (MCILs) are used to estimate true hearing thresholds in individuals with unilateral nonorganic hearing loss. In this study, we determined MCILs and examined the correspondence of MCILs to true hearing thresholds to quantify the accuracy of this procedure. Method Sixteen adults with normal ... Research Article
Research Article  |   December 12, 2017
Estimating Nonorganic Hearing Thresholds Using Binaural Auditory Stimuli
 
Author Affiliations & Notes
  • Linda W. Norrix
    Department of Speech, Language, & Hearing Sciences, The University of Arizona, Tucson
  • Vivian Rubiano
    Department of Speech, Language, & Hearing Sciences, The University of Arizona, Tucson
  • Thomas Muller
    Department of Speech, Language, & Hearing Sciences, The University of Arizona, Tucson
  • Disclosure: The authors have declared that no competing interests existed at the time of publication.
    Disclosure: The authors have declared that no competing interests existed at the time of publication. ×
  • Correspondence to Linda W. Norrix: norrix@email.arizona.edu
  • Editor: Sumitrajit Dhar
    Editor: Sumitrajit Dhar×
  • Associate Editor: Sumitrajit Dhar
    Associate Editor: Sumitrajit Dhar×
Article Information
Hearing & Speech Perception / Hearing Disorders / Research Articles
Research Article   |   December 12, 2017
Estimating Nonorganic Hearing Thresholds Using Binaural Auditory Stimuli
American Journal of Audiology, December 2017, Vol. 26, 486-495. doi:10.1044/2017_AJA-16-0096
History: Received October 4, 2016 , Revised March 1, 2017 , Accepted April 24, 2017
 
American Journal of Audiology, December 2017, Vol. 26, 486-495. doi:10.1044/2017_AJA-16-0096
History: Received October 4, 2016; Revised March 1, 2017; Accepted April 24, 2017

Purpose Minimum contralateral interference levels (MCILs) are used to estimate true hearing thresholds in individuals with unilateral nonorganic hearing loss. In this study, we determined MCILs and examined the correspondence of MCILs to true hearing thresholds to quantify the accuracy of this procedure.

Method Sixteen adults with normal hearing participated. Subjects were asked to feign a unilateral hearing loss at 1.0, 2.0, and 4.0 kHz. MCILs were determined. Subjects also made lateralization judgments for simultaneously presented tones with varying interaural intensity differences.

Results The 90% confidence intervals, calculated for the distributions, indicate that the MCIL in 90% of cases would be expected to be very close to threshold to approximately 17–19 dB poorer than the true hearing threshold. How close the MCIL is to true threshold appears to be based on the individual's response criterion.

Conclusions Response bias influences the MCIL and how close an MCIL is to true hearing threshold. The clinician can never know a client's response bias and therefore should use a 90% confidence interval to predict the range for the expected true threshold. On the basis of this approach, a clinician may assume that true threshold is at or as much as 19 dB better than MCIL.

Acknowledgment
The authors gratefully acknowledge the assistance of M. Borgstrom, PhD, for assisting with statistical analyses.
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