The University of Southampton
University of Southampton Institutional Repository

Auditory localisation abilities in bilateral cochlear implant recipients

Auditory localisation abilities in bilateral cochlear implant recipients
Auditory localisation abilities in bilateral cochlear implant recipients
Objective: To quantify binaural advantage for auditory localization in the horizontal plane by bilateral cochlear implant (CI) recipients. Also, to determine whether the use of dual microphones with one implant improves localization.
Methods: Twenty subjects from the UK multicenter trial of bilateral cochlear implantation with Nucleus 24 K/M device were recruited. Sound localization was assessed in an anechoic room with an 11-loudspeaker array under four test conditions: right CI, left CI, binaural CI, and dual microphone. Two runs were undertaken for each of five stimuli (speech, tones, noise, transients, and reverberant speech). Order of conditions was counterbalanced across subjects.
Results: Mean localization error with bilateral implants was 24[degrees] compared with 67[degrees] for monaural implant and dual microphone conditions (chance performance is 65[degrees]). Normal controls average 2 to 3[degrees] in similar conditions. Binaural performance was significantly better than monaural performance for all subjects, for all stimulus types, and for different sound sources. Only small differences in performance with different stimuli were observed.
Conclusions: Bilateral cochlear implantation with the Nucleus 24 device provides marked improvement in horizontal plane localization abilities compared with unilateral CI use for a range of stimuli having different spectral and temporal characteristics. Benefit was obtained by all subjects, for all stimulus types, and for all sound directions. However, binaural performance was still worse than that obtained by normal hearing listeners and hearing aid users with the same methodology. Monaural localization performance was at chance. There is no benefit for localization with dual microphones.
1531-7129
965-971
Verschuur, Carl A.
5e15ee1c-3a44-4dbe-ad43-ec3b50111e41
Lutman, Mark E.
Ramsden, Richard
dc08b04a-08d9-4570-a61d-300a50898320
Greenham, Paula
1b4f172f-1549-4a3a-a3c6-6f766fd9b09c
O'Driscoll, Martin
84cb2cca-f10a-47a6-92b7-5c041f70c5e8
Verschuur, Carl A.
5e15ee1c-3a44-4dbe-ad43-ec3b50111e41
Lutman, Mark E.
Ramsden, Richard
dc08b04a-08d9-4570-a61d-300a50898320
Greenham, Paula
1b4f172f-1549-4a3a-a3c6-6f766fd9b09c
O'Driscoll, Martin
84cb2cca-f10a-47a6-92b7-5c041f70c5e8

Verschuur, Carl A., Lutman, Mark E., Ramsden, Richard, Greenham, Paula and O'Driscoll, Martin (2005) Auditory localisation abilities in bilateral cochlear implant recipients. Otology & Neurotology, 26 (5), 965-971. (doi:10.1097/01.mao.0000185073.81070.07).

Record type: Article

Abstract

Objective: To quantify binaural advantage for auditory localization in the horizontal plane by bilateral cochlear implant (CI) recipients. Also, to determine whether the use of dual microphones with one implant improves localization.
Methods: Twenty subjects from the UK multicenter trial of bilateral cochlear implantation with Nucleus 24 K/M device were recruited. Sound localization was assessed in an anechoic room with an 11-loudspeaker array under four test conditions: right CI, left CI, binaural CI, and dual microphone. Two runs were undertaken for each of five stimuli (speech, tones, noise, transients, and reverberant speech). Order of conditions was counterbalanced across subjects.
Results: Mean localization error with bilateral implants was 24[degrees] compared with 67[degrees] for monaural implant and dual microphone conditions (chance performance is 65[degrees]). Normal controls average 2 to 3[degrees] in similar conditions. Binaural performance was significantly better than monaural performance for all subjects, for all stimulus types, and for different sound sources. Only small differences in performance with different stimuli were observed.
Conclusions: Bilateral cochlear implantation with the Nucleus 24 device provides marked improvement in horizontal plane localization abilities compared with unilateral CI use for a range of stimuli having different spectral and temporal characteristics. Benefit was obtained by all subjects, for all stimulus types, and for all sound directions. However, binaural performance was still worse than that obtained by normal hearing listeners and hearing aid users with the same methodology. Monaural localization performance was at chance. There is no benefit for localization with dual microphones.

Text
28305.pdf - Version of Record
Restricted to Repository staff only
Request a copy

More information

Published date: 2005
Organisations: Human Sciences Group

Identifiers

Local EPrints ID: 28305
URI: http://eprints.soton.ac.uk/id/eprint/28305
ISSN: 1531-7129
PURE UUID: 87390b9e-1331-4c93-b5e5-7789b9d226f0

Catalogue record

Date deposited: 02 May 2006
Last modified: 15 Mar 2024 07:24

Export record

Altmetrics

Contributors

Author: Mark E. Lutman
Author: Richard Ramsden
Author: Paula Greenham
Author: Martin O'Driscoll

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×