The choice of stimulation strategy affects the ability to detect pure tone inter-aural time differences in children with early bilateral cochlear implantation

Eklöf, Martin; Tideholm, Bo

doi:10.1080/00016489.2018.1424999

Cited by 13 publications

(14 citation statements)

References 17 publications

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“…This suggests that exposure to weakly informative but robust and consistent cues in everyday life might prompt CI listeners to learn to localize even low-frequency sounds (26). Our data support the recent study by Elköf and Tidelhom (21), who reported that half of their FSP population had ITD perception within the physiological range. The participants in their group were all of young age (8-13 years) and had been implanted bilaterally prior to their third year of age.…”

Section: Ild and Itd Perceptionsupporting

confidence: 89%

“…However, it is unclear whether this negative finding resulted from a low number of low-frequency fine-structure channels since this was not reported. Recently, Eklöf and Tideholm ( 21 ) found that half of the CI listeners with FSP had ITD perception within the physiological range (10/20; mean threshold of 330 ± 250 μs) compared to none in the group without fine-structure (FS) coding. Although some FSP listeners appeared to have ITD sensitivity, this stimulation protocol did not improve their low-frequency sound localization.…”

Section: Introductionmentioning

confidence: 99%

“…In order to quantify the effect of the number of bilateral fine-structure channels, we assessed performance for three subgroups: (i) without FSP; (ii) with two bilateral FSP channels; or (iii) with four bilateral FSP channels. In principle, if FSP improves the ITD perception of bilateral CI users by providing reliable cues ( 21 ), a larger number of available FSP channels could increase the potential to exploit this cue. We presented different frequency ranges to dissociate ITD and ILD perception with psychoacoustical tasks and free-field sound localization.…”

Section: Introductionmentioning

confidence: 99%

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Spatial Hearing by Bilateral Cochlear Implant Users With Temporal Fine-Structure Processing

et al. 2020

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Several studies have demonstrated the advantages of the bilateral vs. unilateral cochlear implantation in listeners with bilateral severe to profound hearing loss. However, it remains unclear to what extent bilaterally implanted listeners have access to binaural cues, e.g., accurate processing of interaural timing differences (ITDs) for low-frequency sounds (<1.5 kHz) and interaural level differences (ILDs) for high frequencies (>3 kHz). We tested 25 adult listeners, bilaterally implanted with MED-EL cochlear implant (CI) devices, with and without fine-structure (FS) temporal processing as encoding strategy in the low-frequency channels. In order to assess whether the ability to process binaural cues was affected by fine-structure processing, we performed psychophysical ILD and ITD sensitivity measurements and free-field sound localization experiments. We compared the results of the bilaterally implanted listeners with different numbers of FS channels. All CI listeners demonstrated good sensitivity to ILDs, but relatively poor to ITD cues. Although there was a large variability in performance, some bilateral CI users showed remarkably good localization skills. The FS coding strategy for bilateral CI hearing did not improve fine-structure ITD processing for spatial hearing on a group level. However, some CI listeners were able to exploit weakly informative temporal cues to improve their low-frequency spatial perception.

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Section: Ild and Itd Perceptionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spatial Hearing by Bilateral Cochlear Implant Users With Temporal Fine-Structure Processing

et al. 2020

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“…For Med-El recipients these intensities are mapped to a lower portion of the patients' dynamic range and will produce CI stimulation over a wider range of electrical amplitude (Vaerenberg et al 2014). Localization via CIs is thought to be dominated by ILDs (Seeber & Fastl 2008), even in children where fine structure strategies facilitate some degree of ITD sensitivity (Eklöf & Tideholm, 2018). Since Med-El systems apply less compression to sounds louder than 65 dB SPL compared to Cochlear or Advanced Bionics, ILD cues may have been better preserved for children using Med-El systems in the present study.…”

Section: Rms Error Is Plotted Against Age At Test Inmentioning

confidence: 99%

“…Representations of temporal fine structure also differ between systems and might feasibly influence a user's ability to exploit ITDs (Eklöf & Tideholm, 2018;Thakkar et al, 2018). It is therefore important to control for differences in implant and speech processing characteristics when examining localization outcomes.…”

Section: Introductionmentioning

confidence: 99%

Factors Affecting Sound-Source Localization in Children With Simultaneous or Sequential Bilateral Cochlear Implants

et al. 2018

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Instant improvement in monaural spatial hearing abilities through cognitive feedback

et al. 2022

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Several studies report that sound localization performance of acute and chronic monauralized normal-hearing listeners can improve through training. Typically, training sessions are administered daily for several days or weeks. While this intensive training is effective, it may also be that monaural localization abilities improve instantly after providing explicit top-down information about the direction dependent change in timbre and level. The aim of the present study was to investigate whether cognitive feedback (i.e., top-down information) could instantly improve sound localization in naive acutely monauralized listeners. Forty-three normal-hearing listeners (experimental group), divided over five different centers, were tested. Two control groups, consisting of, respectively, nine and eleven normal-hearing listeners, were tested in one center. Broadband sounds (0.5–20 kHz) were presented from visible loudspeakers, positioned in azimuth (− 90° to 90°). Participants in the experimental group received explicit information about the noticeable difference in timbre and the poor localization in the monauralized listening condition, resulting in an instant improvement in sound localization abilities. With subsequent roving of stimulus level (20 dB), sound localization performance deteriorated immediately. The reported improvement is related to the context of the localization test. The results provide important implications for studies investigating sound localization in a clinical setting, especially during closed-set testing, and indicate the importance of top-down information.

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The choice of stimulation strategy affects the ability to detect pure tone inter-aural time differences in children with early bilateral cochlear implantation

Cited by 13 publications

References 17 publications

Spatial Hearing by Bilateral Cochlear Implant Users With Temporal Fine-Structure Processing

Spatial Hearing by Bilateral Cochlear Implant Users With Temporal Fine-Structure Processing

Factors Affecting Sound-Source Localization in Children With Simultaneous or Sequential Bilateral Cochlear Implants

Instant improvement in monaural spatial hearing abilities through cognitive feedback

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