Dataset Information

Cochlear Place of Stimulation Is One Determinant of Cochlear Implant Sound Quality.

ABSTRACT:

Objective

Our aim was to determine the effect of acute changes in cochlear place of stimulation on cochlear implant (CI) sound quality.

Design

In Experiment 1, 5 single-sided deaf (SSD) listeners fitted with a long (28-mm) electrode array were tested. Basal shifts in place of stimulation were implemented by turning off the most apical electrodes and reassigning the filters to more basal electrodes. In Experiment 2, 2 SSD patients fitted with a shorter (16.5-mm) electrode array were tested. Both basal and apical shifts in place of stimulation were implemented. The apical shifts were accomplished by current steering and creating a virtual place of stimulation more apical that that of the most apical electrode.

Results

Listeners matched basal shifts by shifting, in the normal-hearing ear, the overall spectrum up in frequency and/or increasing voice pitch (F0). Listeners matched apical shifts by shifting down the overall frequency spectrum in the normal-hearing ear.

Conclusion

One factor determining CI voice quality is the location of stimulation along the cochlear partition.

SUBMITTER: Dorman MF

PROVIDER: S-EPMC8091953 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature

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Publications

Cochlear Place of Stimulation Is One Determinant of Cochlear Implant Sound Quality.

Dorman Michael F MF Cook Natale Sarah S Baxter Leslie L Zeitler Daniel M DM Carlson Mathew L ML Noble Jack H JH

Audiology & neuro-otology 20191029 5

<h4>Objective</h4>Our aim was to determine the effect of acute changes in cochlear place of stimulation on cochlear implant (CI) sound quality.<h4>Design</h4>In Experiment 1, 5 single-sided deaf (SSD) listeners fitted with a long (28-mm) electrode array were tested. Basal shifts in place of stimulation were implemented by turning off the most apical electrodes and reassigning the filters to more basal electrodes. In Experiment 2, 2 SSD patients fitted with a shorter (16.5-mm) electrode array wer ...[more]

PMID: 31661682

Similar Datasets

Project description:PurposeCochlear implant (CI) recipients demonstrate variable speech recognition when listening with a CI-alone or electric-acoustic stimulation (EAS) device, which may be due in part to electric frequency-to-place mismatches created by the default mapping procedures. Performance may be improved if the filter frequencies are aligned with the cochlear place frequencies, known as place-based mapping. Performance with default maps versus an experimental place-based map was compared for participants with normal hearing when listening to CI-alone or EAS simulations to observe potential outcomes prior to initiating an investigation with CI recipients.MethodA noise vocoder simulated CI-alone and EAS devices, mapped with default or place-based procedures. The simulations were based on an actual 24-mm electrode array recipient, whose insertion angles for each electrode contact were used to estimate the respective cochlear place frequency. The default maps used the filter frequencies assigned by the clinical software. The filter frequencies for the place-based maps aligned with the cochlear place frequencies for individual contacts in the low- to mid-frequency cochlear region. For the EAS simulations, low-frequency acoustic information was filtered to simulate aided low-frequency audibility. Performance was evaluated for the AzBio sentences presented in a 10-talker masker at +5 dB signal-to-noise ratio (SNR), +10 dB SNR, and asymptote.ResultsPerformance was better with the place-based maps as compared with the default maps for both CI-alone and EAS simulations. For instance, median performance at +10 dB SNR for the CI-alone simulation was 57% correct for the place-based map and 20% for the default map. For the EAS simulation, those values were 59% and 37% correct. Adding acoustic low-frequency information resulted in a similar benefit for both maps.ConclusionsReducing frequency-to-place mismatches, such as with the experimental place-based mapping procedure, produces a greater benefit in speech recognition than maximizing bandwidth for CI-alone and EAS simulations. Ongoing work is evaluating the initial and long-term performance benefits in CI-alone and EAS users.Supplemental materialhttps://doi.org/10.23641/asha.19529053.

Dataset Information

Cochlear Place of Stimulation Is One Determinant of Cochlear Implant Sound Quality.

Objective

Design

Results

Conclusion

Publications

Cochlear Place of Stimulation Is One Determinant of Cochlear Implant Sound Quality.

Similar Datasets

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