Loudness Functions and Binaural Loudness Summation in Bilateral Cochlear Implant Users

Kordus, Monika; Żera, Jan

doi:10.1515/aoa-2017-0037

Cited by 2 publications

(1 citation statement)

References 18 publications

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“…Their results also showed a two-fold increase of loudness of the bilateral stimulation compared to the unilateral stimulation in a large part of the dynamic range. Kordus and Żera (2017) tested 15 biCI users via their own processors, and found a large variability of bilateral loudness perception, similar to the large variability observed in HI listeners ( Oetting et al, 2016 ; van Beurden et al, 2018 ). Blamey et al (2000) measured binaural loudness perception in unilateral CI users with a residual hearing in the contralateral ear aided with a hearing aid.…”

Section: Introductionsupporting

confidence: 55%

Spectral and binaural loudness summation of equally loud narrowband signals in single-sided-deafness and bilateral cochlear implant users

Hartog

Kollmeier

et al. 2022

Front. Neurosci.

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Recent studies on loudness perception of binaural broadband signals in hearing impaired listeners found large individual differences, suggesting the use of such signals in hearing aid fitting. Likewise, clinical cochlear implant (CI) fitting with narrowband/single-electrode signals might cause suboptimal loudness perception in bilateral and bimodal CI listeners. Here spectral and binaural loudness summation in normal hearing (NH) listeners, bilateral CI (biCI) users, and unilateral CI (uCI) users with normal hearing in the unaided ear was investigated to assess the relevance of binaural/bilateral fitting in CI users. To compare the three groups, categorical loudness scaling was performed for an equal categorical loudness noise (ECLN) consisting of the sum of six spectrally separated third-octave noises at equal loudness. The acoustical ECLN procedure was adapted to an equivalent procedure in the electrical domain using direct stimulation. To ensure the same broadband loudness in binaural measurements with simultaneous electrical and acoustical stimulation, a modified binaural ECLN was introduced and cross validated with self-adjusted loudness in a loudness balancing experiment. Results showed a higher (spectral) loudness summation of the six equally loud narrowband signals in the ECLN in CI compared to NH. Binaural loudness summation was found for all three listener groups (NH, uCI, and biCI). No increased binaural loudness summation could be found for the current uCI and biCI listeners compared to the NH group. In uCI loudness balancing between narrowband signals and single electrodes did not automatically result in a balanced loudness perception across ears, emphasizing the importance of binaural/bilateral fitting.

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Section: Introductionsupporting

confidence: 55%

Spectral and binaural loudness summation of equally loud narrowband signals in single-sided-deafness and bilateral cochlear implant users

Hartog

Kollmeier

et al. 2022

Front. Neurosci.

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Perceptual Loudness Growth in Cochlear Implant Users

Lee

2022

Audiol Speech Res

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Purpose: Despite a growing number of cochlear implant (CI) studies, little attention has been given to loudness perception. The overall purpose of this study is to obtain the perceptual loudness growth from CI users and systematically investigate it with other relevant variables.Methods: Fourteen CI users and 14 normal hearing (NH) adults participated in this study. Loudness growth functions were obtained using three warble tones presented at 500 Hz, 1 kHz, and 4 kHz. Sentence recognition tests were implemented under favorable and adverse noise conditions. Mapping parameters including T-level, C-level, and electrical dynamic range were analyzed in conjunction with outcomes from the loudness growth.Results: The loudness growth curves for CI group were sharper than those for NH group. CI group showed a narrower acoustic dynamic range than NH group. There was no significant relationship between acoustic dynamic range and electrical dynamic range for CI users. Sentence recognition scores in adverse noise conditions were associated with electrical dynamic range in CI users. In NH group, a significant positive relationship was found between sentence recognition scores in adverse condition and acoustic dynamic range.Conclusion: This study showed that the perceptual loudness growth of CI users is not identical to that of NH adults, due to the unique way of signal processing mechanisms. Acoustic dynamic range for CI users seems affected by gain control algorithms. The adjusting mapping parameters associated with loudness may improve speech perception performance regardless of the dynamic range of CIs.

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Loudness Functions and Binaural Loudness Summation in Bilateral Cochlear Implant Users

Cited by 2 publications

References 18 publications

Spectral and binaural loudness summation of equally loud narrowband signals in single-sided-deafness and bilateral cochlear implant users

Spectral and binaural loudness summation of equally loud narrowband signals in single-sided-deafness and bilateral cochlear implant users

Perceptual Loudness Growth in Cochlear Implant Users

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