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Sensitivity to interaural time differences (ITDs) in acoustic hearing involves comparison of interaurally frequency-matched inputs. Bilateral cochlear-implant arrays are, however, only approximately aligned in angular insertion depth and scalar location across the cochleae. Interaural place-of-stimulation mismatch therefore has the potential to impact binaural perception. ITD left-right discrimination thresholds were examined in 23 postlingually-deafened adult bilateral cochlear-implant listeners, using low-rate constant-amplitude pulse trains presented via direct stimulation to single electrodes in each ear. Angular insertion depth and scalar location measured from computed-tomography (CT) scans were used to quantify interaural mismatch, and their association with binaural performance was assessed. Number-matched electrodes displayed a median interaural insertion-depth mismatch of 18° and generally yielded best or near-best ITD discrimination thresholds. Two listeners whose discrimination thresholds did not show this pattern were confirmed via CT to have atypical array placement. Listeners with more number-matched electrode pairs located in the scala tympani displayed better thresholds than listeners with fewer such pairs. ITD tuning curves as a function of interaural electrode separation were broad; bandwidths at twice the threshold minimum averaged 10.5 electrodes (equivalent to 5.9 mm for a Cochlear-brand pre-curved array). Larger angular insertion-depth differences were associated with wider bandwidths. Wide ITD tuning curve bandwidths appear to be a product of both monopolar stimulation and angular insertion-depth mismatch. Cases of good ITD sensitivity with very wide bandwidths suggest that precise matching of insertion depth is not critical for discrimination thresholds. Further prioritizing scala tympani location at implantation should, however, benefit ITD sensitivity.

Titel:	The Relationship Between Interaural Insertion-Depth Differences, Scalar Location, and Interaural Time-Difference Processing in Adult Bilateral Cochlear-Implant Listeners.
Autor/in / Beteiligte Person:	Cleary, M ; Bernstein, JGW ; Stakhovskaya, OA ; Noble, J ; Kolberg, E ; Jensen, KK ; Hoa, M ; Kim, HJ ; Goupell, MJ
Link:	Full Text Finder (Volltext)
Zeitschrift:	Trends in hearing, Jg. 26 (2022), S. 23312165221129165
Veröffentlichung:	[Thousand Oaks, CA] : Sage Publications Inc, [2014]-, 2022
Medientyp:	academicJournal
ISSN:	2331-2165 (electronic)
DOI:	10.1177/23312165221129165
Schlagwort:	Adult Humans Acoustic Stimulation methods Hearing Hearing Tests Cochlear Implants Cochlear Implantation Sound Localization physiology
Sonstiges:	Nachgewiesen in: MEDLINE Sprachen: English Publication Type: Journal Article; Research Support, N.I.H., Extramural Language: English [Trends Hear] 2022 Jan-Dec; Vol. 26, pp. 23312165221129165. MeSH Terms: Cochlear Implants* ; Cochlear Implantation* ; Sound Localization* / physiology ; Adult ; Humans ; Acoustic Stimulation / methods ; Hearing ; Hearing Tests References: J Acoust Soc Am. 2006 Oct;120(4):2190-201. (PMID: 17069315) ; Otol Neurotol. 2019 Jun;40(5):617-624. (PMID: 31083083) ; J Acoust Soc Am. 1988 Apr;83(4):1508-16. (PMID: 3372866) ; Ann Otol Rhinol Laryngol Suppl. 2007 Apr;197:2-24. (PMID: 17542465) ; J Acoust Soc Am. 2013 Aug;134(2):EL147-52. (PMID: 23927217) ; J Acoust Soc Am. 2003 Sep;114(3):1565-74. (PMID: 14514210) ; Audiol Neurootol. 2004 Jul-Aug;9(4):234-46. (PMID: 15205551) ; Med Phys. 2018 Nov;45(11):5030-5040. (PMID: 30218461) ; Trends Hear. 2018 Jan-Dec;22:2331216518781746. (PMID: 29956589) ; JASA Express Lett. 2021 Dec;1(12):124401. 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The Relationship Between Interaural Insertion-Depth Differences, Scalar Location, and Interaural Time-Difference Processing in Adult Bilateral Cochlear-Implant Listeners.