Reweighting of Binaural Localization Cues in Bilateral Cochlear-Implant Listeners.
Interaural level difference
Interaural time difference
Plasticity
Thresholds
Training
Journal
Journal of the Association for Research in Otolaryngology : JARO
ISSN: 1438-7573
Titre abrégé: J Assoc Res Otolaryngol
Pays: United States
ID NLM: 100892857
Informations de publication
Date de publication:
02 2022
02 2022
Historique:
received:
26
04
2021
accepted:
13
10
2021
pubmed:
24
11
2021
medline:
30
4
2022
entrez:
23
11
2021
Statut:
ppublish
Résumé
Normal-hearing (NH) listeners rely on two binaural cues, the interaural time (ITD) and level difference (ILD), for azimuthal sound localization. Cochlear-implant (CI) listeners, however, rely almost entirely on ILDs. One reason is that present-day clinical CI stimulation strategies do not convey salient ITD cues. But even when presenting ITDs under optimal conditions using a research interface, ITD sensitivity is lower in CI compared to NH listeners. Since it has recently been shown that NH listeners change their ITD/ILD weighting when only one of the cues is consistent with visual information, such reweighting might add to CI listeners' low perceptual contribution of ITDs, given their daily exposure to reliable ILDs but unreliable ITDs. Six bilateral CI listeners completed a multi-day lateralization training visually reinforcing ITDs, flanked by a pre- and post-measurement of ITD/ILD weights without visual reinforcement. Using direct electric stimulation, we presented 100- and 300-pps pulse trains at a single interaurally place-matched electrode pair, conveying ITDs and ILDs in various spatially consistent and inconsistent combinations. The listeners' task was to lateralize the stimuli in a virtual environment. Additionally, ITD and ILD thresholds were measured before and after training. For 100-pps stimuli, the lateralization training increased the contribution of ITDs slightly, but significantly. Thresholds were neither affected by the training nor correlated with weights. For 300-pps stimuli, ITD weights were lower and ITD thresholds larger, but there was no effect of training. On average across test sessions, adding azimuth-dependent ITDs to stimuli containing ILDs increased the extent of lateralization for both 100- and 300-pps stimuli. The results suggest that low-rate ITD cues, robustly encoded with future CI systems, may be better exploitable for sound localization after increasing their perceptual weight via training.
Identifiants
pubmed: 34812980
doi: 10.1007/s10162-021-00821-3
pii: 10.1007/s10162-021-00821-3
pmc: PMC8782964
doi:
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Langues
eng
Sous-ensembles de citation
IM
Pagination
119-136Informations de copyright
© 2021. The Author(s).
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