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Titre : | Single-Sided Deafness Cochlear Implant Sound-Localization Behavior With Multiple Concurrent Sources (2022) |
Auteurs : | Joshua G. W. Bernstein ; Sandeep A. Phatak ; Gerald Schuchman ; Olga A. Stakhovskaya ; Arnaldo L. Rivera ; Douglas Brungart |
Type de document : | Article |
Dans : | Ear and hearing (Vol.43, n°1, Janvier-février 2022) |
Article en page(s) : | p. 206-219 |
Langues: | Anglais |
Descripteurs : |
HE Vinci 18ème siècle ; Aide auditive directionnelle ; Audition binaurale ; Perception spatiale ; Perte auditive asymétrique ; Perte auditive unilatérale (USNHL) ; Stimulation acoustique |
Résumé : |
For listeners with one deaf ear and the other ear with normal/near-normal hearing (single-sided deafness [SSD]) or moderate hearing loss (asymmetric hearing loss), cochlear implants (CIs) can improve speech understanding in noise and sound-source localization. Previous SSD-CI localization studies have used a single source with artificial sounds such as clicks or random noise. While this approach provides insights regarding the auditory cues that facilitate localization, it does not capture the complex nature of localization behavior in real-world environments. This study examined SSD-CI sound localization in a complex scenario where a target sound was added to or removed from a mixture of other environmental sounds, while tracking head movements to assess behavioral strategy.
Design: Eleven CI users with normal hearing or moderate hearing loss in the contralateral ear completed a sound-localization task in monaural (CI-OFF) and bilateral (CI-ON) configurations. Ten of the listeners were also tested before CI activation to examine longitudinal effects. Two-second environmental sound samples, looped to create 4- or 10-sec trials, were presented in a spherical array of 26 loudspeakers encompassing +/-144[degrees] azimuth and +/-30[degrees] elevation at a 1-m radius. The target sound was presented alone (localize task) or concurrently with one or three additional sources presented to different loudspeakers, with the target cued by being added to (Add) or removed from (Rem) the mixture after 6 sec. A head-mounted tracker recorded movements in six dimensions (three for location, three for orientation). Mixed-model regression was used to examine target sound-identification accuracy, localization accuracy, and head movement. Angular and translational head movements were analyzed both before and after the target was switched on or off. |
Disponible en ligne : | Oui |
En ligne : | https://login.ezproxy.vinci.be/login?url=https://ovidsp.ovid.com/ovidweb.cgi?T=JS&CSC=Y&NEWS=N&PAGE=fulltext&D=yrovftx&AN=00003446-202201000-00019 |