Perception of Interaural Phase Differences With Envelope and Fine Structure Coding Strategies in Bilateral Cochlear Implant 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 str...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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SAGE Publishing
2016-09-01
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| Series: | Trends in Hearing |
| Online Access: | https://doi.org/10.1177/2331216516665608 |
| _version_ | 1819315714962489344 |
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| author | Stefan Zirn Susan Arndt Antje Aschendorff Roland Laszig Thomas Wesarg |
| author_facet | Stefan Zirn Susan Arndt Antje Aschendorff Roland Laszig Thomas Wesarg |
| author_sort | Stefan Zirn |
| collection | DOAJ |
| description | 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 IPD is highly desirable. In this study, we compared two coding strategies in BiCI users provided with CI systems from MED-EL (Innsbruck, Austria). The CI systems were bilaterally programmed either with the fine structure processing strategy FS4 or with the constant rate strategy high definition continuous interleaved sampling (HDCIS). Familiarization periods between 6 and 12 weeks were considered. The effect of IPD was measured in two types of experiments: (a) IPD detection thresholds with tonal signals addressing mainly one apical interaural electrode pair and (b) with speech in noise in terms of binaural speech intelligibility level differences (BILD) addressing multiple electrodes bilaterally. The results in (a) showed improved IPD detection thresholds with FS4 compared with HDCIS in four out of the seven BiCI users. In contrast, 12 BiCI users in (b) showed similar BILD with FS4 (0.6 ± 1.9 dB) and HDCIS (0.5 ± 2.0 dB). However, no correlation between results in (a) and (b) both obtained with FS4 was found. In conclusion, the degree of IPD sensitivity determined on an apical interaural electrode pair was not an indicator for BILD based on bilateral multielectrode stimulation. |
| first_indexed | 2024-12-24T10:04:30Z |
| format | Article |
| id | doaj.art-8d94ae17e307497aa033944792b06e3e |
| institution | Directory Open Access Journal |
| issn | 2331-2165 |
| language | English |
| last_indexed | 2024-12-24T10:04:30Z |
| publishDate | 2016-09-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Trends in Hearing |
| spelling | doaj.art-8d94ae17e307497aa033944792b06e3e2022-12-21T17:00:54ZengSAGE PublishingTrends in Hearing2331-21652016-09-012010.1177/233121651666560810.1177_2331216516665608Perception of Interaural Phase Differences With Envelope and Fine Structure Coding Strategies in Bilateral Cochlear Implant UsersStefan Zirn0Susan Arndt1Antje Aschendorff2Roland Laszig3Thomas Wesarg4University of Applied Sciences Offenburg, GermanyDepartment of Oto-Rhino-Laryngology of the Medical Center, University of Freiburg, GermanyDepartment of Oto-Rhino-Laryngology of the Medical Center, University of Freiburg, GermanyDepartment of Oto-Rhino-Laryngology of the Medical Center, University of Freiburg, GermanyDepartment of Oto-Rhino-Laryngology of the Medical Center, University of Freiburg, GermanyThe 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 IPD is highly desirable. In this study, we compared two coding strategies in BiCI users provided with CI systems from MED-EL (Innsbruck, Austria). The CI systems were bilaterally programmed either with the fine structure processing strategy FS4 or with the constant rate strategy high definition continuous interleaved sampling (HDCIS). Familiarization periods between 6 and 12 weeks were considered. The effect of IPD was measured in two types of experiments: (a) IPD detection thresholds with tonal signals addressing mainly one apical interaural electrode pair and (b) with speech in noise in terms of binaural speech intelligibility level differences (BILD) addressing multiple electrodes bilaterally. The results in (a) showed improved IPD detection thresholds with FS4 compared with HDCIS in four out of the seven BiCI users. In contrast, 12 BiCI users in (b) showed similar BILD with FS4 (0.6 ± 1.9 dB) and HDCIS (0.5 ± 2.0 dB). However, no correlation between results in (a) and (b) both obtained with FS4 was found. In conclusion, the degree of IPD sensitivity determined on an apical interaural electrode pair was not an indicator for BILD based on bilateral multielectrode stimulation.https://doi.org/10.1177/2331216516665608 |
| spellingShingle | Stefan Zirn Susan Arndt Antje Aschendorff Roland Laszig Thomas Wesarg Perception of Interaural Phase Differences With Envelope and Fine Structure Coding Strategies in Bilateral Cochlear Implant Users Trends in Hearing |
| title | Perception of Interaural Phase Differences With Envelope and Fine Structure Coding Strategies in Bilateral Cochlear Implant Users |
| title_full | Perception of Interaural Phase Differences With Envelope and Fine Structure Coding Strategies in Bilateral Cochlear Implant Users |
| title_fullStr | Perception of Interaural Phase Differences With Envelope and Fine Structure Coding Strategies in Bilateral Cochlear Implant Users |
| title_full_unstemmed | Perception of Interaural Phase Differences With Envelope and Fine Structure Coding Strategies in Bilateral Cochlear Implant Users |
| title_short | Perception of Interaural Phase Differences With Envelope and Fine Structure Coding Strategies in Bilateral Cochlear Implant Users |
| title_sort | perception of interaural phase differences with envelope and fine structure coding strategies in bilateral cochlear implant users |
| url | https://doi.org/10.1177/2331216516665608 |
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