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Simulating the effect of interaural mismatch in the insertion depth of bilateral cochlear implants on speech perception

Simulating the effect of interaural mismatch in the insertion depth of bilateral cochlear implants on speech perception
Simulating the effect of interaural mismatch in the insertion depth of bilateral cochlear implants on speech perception
A bilateral advantage for diotically presented stimuli has been observed for cochlear implant (CI) users and is suggested to be dependent on symmetrical implant performance. Studies using CI simulations have not shown a true “bilateral” advantage, but a “better ear” effect and have demonstrated that performance decreases with increasing basalward shift in insertion depth. This study aimed to determine whether there is a bilateral advantage for CI simulations with interaurally matched insertions and the extent to which performance is affected by interaural insertion depth mismatch. Speech perception in noise and self-reported ease of listening were measured using matched bilateral, mismatched bilateral and unilateral CI simulations over four insertion depths for seventeen normal hearing listeners. Speech scores and ease of listening reduced with increasing basalward shift in (interaurally matched) insertion depth. A bilateral advantage for speech perception was only observed when the insertion depths were interaurally matched and deep. No advantage was observed for small to moderate interaural insertion-depth mismatches, consistent with a better ear effect. Finally, both measures were poorer than expected for a better ear effect for large mismatches, suggesting that misalignment of the electrode arrays may prevent a bilateral advantage and detrimentally affect perception of diotically presented speech.
cochlear implants, electrodes, hearing, speech
0001-4966
1348-1357
van Besouw, R.M.
464435ed-eadc-4fcc-9d69-eb267d8fe81b
Forrester, Lisa
653247ee-4d91-4c6e-b6f7-c46286787e5c
Crowe, Nicholas
ecfcefb2-3470-4ac7-859f-4933e3382fc8
Rowan, D.
5a86eebe-53da-4cd2-953e-e3ca1ae61578
van Besouw, R.M.
464435ed-eadc-4fcc-9d69-eb267d8fe81b
Forrester, Lisa
653247ee-4d91-4c6e-b6f7-c46286787e5c
Crowe, Nicholas
ecfcefb2-3470-4ac7-859f-4933e3382fc8
Rowan, D.
5a86eebe-53da-4cd2-953e-e3ca1ae61578

van Besouw, R.M., Forrester, Lisa, Crowe, Nicholas and Rowan, D. (2013) Simulating the effect of interaural mismatch in the insertion depth of bilateral cochlear implants on speech perception. Journal of the Acoustical Society of America, 134 (2), 1348-1357. (doi:10.1121/1.4812272).

Record type: Article

Abstract

A bilateral advantage for diotically presented stimuli has been observed for cochlear implant (CI) users and is suggested to be dependent on symmetrical implant performance. Studies using CI simulations have not shown a true “bilateral” advantage, but a “better ear” effect and have demonstrated that performance decreases with increasing basalward shift in insertion depth. This study aimed to determine whether there is a bilateral advantage for CI simulations with interaurally matched insertions and the extent to which performance is affected by interaural insertion depth mismatch. Speech perception in noise and self-reported ease of listening were measured using matched bilateral, mismatched bilateral and unilateral CI simulations over four insertion depths for seventeen normal hearing listeners. Speech scores and ease of listening reduced with increasing basalward shift in (interaurally matched) insertion depth. A bilateral advantage for speech perception was only observed when the insertion depths were interaurally matched and deep. No advantage was observed for small to moderate interaural insertion-depth mismatches, consistent with a better ear effect. Finally, both measures were poorer than expected for a better ear effect for large mismatches, suggesting that misalignment of the electrode arrays may prevent a bilateral advantage and detrimentally affect perception of diotically presented speech.

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More information

Published date: July 2013
Keywords: cochlear implants, electrodes, hearing, speech
Organisations: Human Sciences Group

Identifiers

Local EPrints ID: 354875
URI: http://eprints.soton.ac.uk/id/eprint/354875
ISSN: 0001-4966
PURE UUID: c2d019e3-d57a-470d-86e2-4b8131fd4f49
ORCID for D. Rowan: ORCID iD orcid.org/0000-0002-7190-9997

Catalogue record

Date deposited: 22 Jul 2013 10:59
Last modified: 09 Jan 2022 03:11

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Contributors

Author: R.M. van Besouw
Author: Lisa Forrester
Author: Nicholas Crowe
Author: D. Rowan ORCID iD

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