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Influence of Bilateral Fitting Parameters on Binaural Unmasking in BICI Users

  • The ability to detect a target signal masked by noise is improved in normal-hearing listeners when interaural phase differences (IPDs) between the ear signals exist either in the masker or in the signal. To improve binaural hearing in bilaterally implanted cochlear implant (BiCI) users, a coding strategy providing the best possible access to IPDs is highly desirable. Outcomes of a previous studyThe ability to detect a target signal masked by noise is improved in normal-hearing listeners when interaural phase differences (IPDs) between the ear signals exist either in the masker or in the signal. To improve binaural hearing in bilaterally implanted cochlear implant (BiCI) users, a coding strategy providing the best possible access to IPDs is highly desirable. Outcomes of a previous study (Zirn, Arndt et al. 2016) revealed that a subset of BiCI users showed improved IPD detection thresholds with the fine structure processing strategy FS4 compared to the constant rate strategy HDCIS using narrowband stimuli. In contrast, little differences between the coding strategies were found for broadband stimuli with regard to binaural speech intelligibility level differences (BILD) as an estimate of binaural unmasking. Compared to normalhearing listeners (7.5 ± 1.2 dB) BILD were small in BiCI users (around 0.5 dB with both coding strategies). In the present work, we investigated the influence of binaural fitting parameters on BILD. In our cohort of BiCI users many were implanted with electrode arrays differing in length left versus right. Because this length difference typically corresponded to the distance of two electrode contacts the first modification of bilateral fitting was a tonotopic adjustment by deactivation of the most apical electrode contact on the side with the deeper inserted array (tonotopic approach). The second modification was the isolation of the residual, most apical electrode contacts by deactivation of the basally adjacent electrode contact on each side (tonotopic sparse approach). Applying these modifications, BILD improved by up to 1.5 dB.show moreshow less

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Metadaten
Document Type:Conference Proceeding
Conference Type:Konferenz-Poster
Zitierlink: https://opus.hs-offenburg.de/2557
Bibliografische Angaben
Title (English):Influence of Bilateral Fitting Parameters on Binaural Unmasking in BICI Users
Conference:Conference on Implantable Auditory Prostheses, July 16-21, 2017, Lake Tahoe, CA
Author:Stefan ZirnStaff MemberORCiDGND, Susan Arndt, Thomas WesargStaff MemberORCiDGND
Year of Publication:2017
Page Number:1
First Page:128
Last Page:128
Article Number:M34b
Parent Title (English):2017 Conference on Implantable Auditory Prostheses
URL:http://ciaphome.org/index_html_files/CIAP2017FinalProgramBook.pdf
Language:English
Inhaltliche Informationen
Institutes:Fakultät Elektrotechnik und Informationstechnik (E+I) (bis 03/2019)
Institutes:Bibliografie
Formale Angaben
Open Access: Open Access 
Licence (German):License LogoCreative Commons - Namensnennung