Implications of high-frequency cochlear dead regions for fitting hearing aids to adults with mild to moderately severe hearing loss.

Ear and Hearing
Robyn M CoxGenevieve C Alexander

Abstract

A cochlear dead region (DR) occurs at a given frequency when there is a loss of normal functioning of inner hair cells tuned to that frequency. It has been suggested that existence of high-frequency DRs has implications for hearing aid fitting, and that the optimal amount of high-frequency gain is reduced for these patients. However, the data supporting this suggestion has been obtained using listeners with severe or profound hearing loss. It is uncertain whether these results would apply for listeners with the mild to moderately severe hearing loss that is more typical of hearing aid users. This investigation used laboratory and field measurements to examine the effects of reduced high-frequency gain in typical hearing aid users with high-frequency DRs compared with matched users without DRs. The study was a double-blinded, nonrandomized intervention design with 18 matched pairs of adult subjects. In each pair, one subject had high-frequency DRs (usually at one or two test frequencies) and the other subject had no DR. Each subject was fitted unilaterally with a hearing aid having two active programs. One program used a National Acoustics Laboratories (NAL) prescription target for average speech (NAL condition). The other progr...Continue Reading

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Citations

Jul 22, 2014·International Journal of Otolaryngology·K L Tremblay, C W Miller
Jul 13, 2013·IEEE Transactions on Bio-medical Engineering·Zhangli Chen, Guangshu Hu
Apr 11, 2017·International Journal of Audiology·Andreas S HansenBrian C J Moore
Apr 18, 2015·CoDAS·Vanessa Clarizia Marchesin, Maria Cecília Martinelli Iório

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