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자료유형
학술저널
저자정보
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대한이비인후과학회 Clinical and Experimental Otorhinolaryngology Clinical and Experimental Otorhinolaryngology 제7권 제2호
발행연도
2014.1
수록면
94 - 101 (8page)

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Objectives. The goal of the present study was to examine whether Acceptable Noise Levels (ANLs) would be lower (greater acceptance of noise) in binaural listening than in monaural listening condition and also whether meaningfulness of background speech noise would affect ANLs for directional microphone hearing aid users. In addition, any relationships between the individual binaural benefits on ANLs and the individuals’ demographic information were investigated. Methods. Fourteen hearing aid users (mean age, 64 years) participated for experimental testing. For the ANL calculation, listeners’ most comfortable listening levels and background noise level were measured. Using Korean ANL material, ANLs of all participants were evaluated under monaural and binaural amplification with a counterbalanced order. The ANLs were also compared across five types of competing speech noises, consisting of 1- through 8-talker back- ground speech maskers. Seven young normal-hearing listeners (mean age, 27 years) participated for the same mea- surements as a pilot testing. Results. The results demonstrated that directional hearing aid users accepted more noise (lower ANLs) with binaural ampli- fication than with monaural amplification, regardless of the type of competing speech. When the background speech noise became more meaningful, hearing-impaired listeners accepted less amount of noise (higher ANLs), revealing that ANL is dependent on the intelligibility of the competing speech. The individuals’ binaural advantages in ANLs were significantly greater for the listeners with longer experience of hearing aids, yet not related to their age or hear- ing thresholds. Conclusion. Binaural directional microphone processing allowed hearing aid users to accept a greater amount of back- ground noise, which may in turn improve listeners’ hearing aid success. Informational masking substantially influ- enced background noise acceptance. Given a significant association between ANLs and duration of hearing aid usage, ANL measurement can be useful for clinical counseling of binaural hearing aid candidates or unsuccessful users.

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