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Journal of Speech, Language, and Hearing Research Vol.44 1209-1214 December 2001. doi:10.1044/1092-4388(2001/094)
© American Speech-Language-Hearing Association
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Effects of CIC Hearing Aids on Auditory Localization by Listeners With Normal Hearing

William R. D'Angelo 1
Robert S. Bolia 1
Pamela J. Mishler 2

Linda J. Morris 1
1 Air Force Research Laboratory Wright-Patterson Air Force Base, OH
2 Dayton Veterans Affairs Medical Center Dayton, OH

wdangelo{at}neuron.uchc.edu

An experiment was conducted to determine the effects of completely-in-the-canal (CIC) hearing aids on auditory localization performance. Six normal-hearing listeners localized a 750-ms broadband noise from loudspeakers ranging in azimuth from –180° to +180° and in elevation from –75° to +90°. Independent variables included the presence or absence of the hearing aid and the elevation of the source. Dependent measures included azimuth error, elevation error, and the percentage of trials resulting in a front-back confusion. The findings indicate a statistically significant decrement in localization acuity, both in azimuth and elevation, occasioned by the wearing of CIC hearing aids. However, the magni-tude of this decrement was small compared to those typically caused by other ear-canal occlusions, such as earplugs, and would probably not engender mislocalization of real-world sounds.

KEY WORDS: localization, hearing aids, CIC

Submitted on October 23, 2000
Accepted on August 31, 2001


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