دورية أكاديمية
Amount of Frequency Compression in Bimodal Cochlear Implant Users Is a Poor Predictor for Audibility and Spatial Hearing
العنوان: | Amount of Frequency Compression in Bimodal Cochlear Implant Users Is a Poor Predictor for Audibility and Spatial Hearing |
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اللغة: | English |
المؤلفون: | Sharma, Snandan, Nogueira, Waldo, van Opstal, A. John, Chalupper, Josef, Mens, Lucas H. M., van Wanrooij, Marc M. |
المصدر: | Journal of Speech, Language, and Hearing Research. Dec 2021 64(12):5000-5013. |
الإتاحة: | American Speech-Language-Hearing Association. 2200 Research Blvd #250, Rockville, MD 20850. Tel: 301-296-5700; Fax: 301-296-8580; e-mail: slhr@asha.org; Web site: http://jslhr.pubs.asha.org |
Peer Reviewed: | Y |
Page Count: | 14 |
تاريخ النشر: | 2021 |
نوع الوثيقة: | Journal Articles Reports - Research |
Descriptors: | Speech Communication, Comprehension, Acoustics, Assistive Technology, Hearing Impairments, Spatial Ability, Auditory Perception, Older Adults |
DOI: | 10.1044/2021_JSLHR-20-00653 |
تدمد: | 1092-4388 |
مستخلص: | Purpose: Speech understanding in noise and horizontal sound localization is poor in most cochlear implant (CI) users with a hearing aid (bimodal stimulation). This study investigated the effect of static and less-extreme adaptive frequency compression in hearing aids on spatial hearing. By means of frequency compression, we aimed to restore high-frequency audibility, and thus improve sound localization and spatial speech recognition. Method: Sound-detection thresholds, sound localization, and spatial speech recognition were measured in eight bimodal CI users, with and without frequency compression. We tested two compression algorithms: a static algorithm, which compressed frequencies beyond the compression knee point (160 or 480 Hz), and an adaptive algorithm, which aimed to compress only consonants leaving vowels unaffected (adaptive knee-point frequencies from 736 to 2946 Hz). Results: Compression yielded a strong audibility benefit (high-frequency thresholds improved by 40 and 24 dB for static and adaptive compression, respectively), no meaningful improvement in localization performance (errors remained > 30 deg), and spatial speech recognition across all participants. Localization biases without compression (toward the hearing-aid and implant side for low- and high-frequency sounds, respectively) disappeared or reversed with compression. The audibility benefits provided to each bimodal user partially explained any individual improvements in localization performance; shifts in bias; and, for six out of eight participants, benefits in spatial speech recognition. Conclusions: We speculate that limiting factors such as a persistent hearing asymmetry and mismatch in spectral overlap prevent compression in bimodal users from improving sound localization. Therefore, the benefit in spatial release from masking by compression is likely due to a shift of attention to the ear with the better signal-to-noise ratio facilitated by compression, rather than an improved spatial selectivity. |
Abstractor: | As Provided |
Entry Date: | 2022 |
رقم الأكسشن: | EJ1325160 |
قاعدة البيانات: | ERIC |
تدمد: | 1092-4388 |
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DOI: | 10.1044/2021_JSLHR-20-00653 |