[Processing of interaural time differences in normal-hearing subjects and cochlear implant users with FSP and HDCIS coding strategy].
Verarbeitung interauraler Zeitdifferenzen bei Normalhörenden und Cochlea-Implantat-Trägern mit FSP- und HDCIS-Kodierungsstrategie.
Fine structure processing
High-definition continuous interleaved sampling
Mismatch negativity
Psychoacoustic
Source localization
Journal
HNO
ISSN: 1433-0458
Titre abrégé: HNO
Pays: Germany
ID NLM: 2985099R
Informations de publication
Date de publication:
Nov 2019
Nov 2019
Historique:
pubmed:
16
6
2019
medline:
23
11
2019
entrez:
16
6
2019
Statut:
ppublish
Résumé
Sound localization is necessary for social interaction and remains challenging for bilateral cochlear implant (CI) users. This study investigated the influence of fine structure processing (FSP) coding strategies on temporal accuracy and source localization. The ability to discriminate between different interaural time differences (ITD) was measured objectively and compared. Fifteen normal-hearing subjects and five CI users participated in this study. Electrophysiological recording of mismatch negativity (MMN) and psychoacoustic tests with headphones and loudspeakers were conducted to measure and compare the discrimination of ITDs. In normal-hearing subjects the discrimination threshold for ITD was 83-117 µs. Localization ability in a free sound field was below the limit of resolution. A significant MMN was measured. CI users showed a mean angle detection error of more than 30° and a discrimination threshold between 1100 and 2100 µs. Due to artifacts, no clear MMN component could be recorded. This study shows that MMN can be used as an objective measure of ITD discrimination in normal-hearing participants. An indication that improvements in directional hearing can be achieved with the transfer of fine structure could not be provided by this study.
Sections du résumé
BACKGROUND
BACKGROUND
Sound localization is necessary for social interaction and remains challenging for bilateral cochlear implant (CI) users. This study investigated the influence of fine structure processing (FSP) coding strategies on temporal accuracy and source localization. The ability to discriminate between different interaural time differences (ITD) was measured objectively and compared.
MATERIALS AND METHODS
METHODS
Fifteen normal-hearing subjects and five CI users participated in this study. Electrophysiological recording of mismatch negativity (MMN) and psychoacoustic tests with headphones and loudspeakers were conducted to measure and compare the discrimination of ITDs.
RESULTS
RESULTS
In normal-hearing subjects the discrimination threshold for ITD was 83-117 µs. Localization ability in a free sound field was below the limit of resolution. A significant MMN was measured. CI users showed a mean angle detection error of more than 30° and a discrimination threshold between 1100 and 2100 µs. Due to artifacts, no clear MMN component could be recorded.
CONCLUSION
CONCLUSIONS
This study shows that MMN can be used as an objective measure of ITD discrimination in normal-hearing participants. An indication that improvements in directional hearing can be achieved with the transfer of fine structure could not be provided by this study.
Identifiants
pubmed: 31201511
doi: 10.1007/s00106-019-0699-2
pii: 10.1007/s00106-019-0699-2
doi:
Types de publication
Journal Article
Langues
ger
Sous-ensembles de citation
IM
Pagination
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