Source localization of auditory evoked potentials after cochlear implantation
Source localization of auditory evoked potentials after cochlear implantation
Little is known about how the auditory cortex adapts to artificial input as provided by a cochlear implant (CI). We report the case of a 71-year-old profoundly deaf man, who has successfully used a unilateral CI for 4 years. Independent component analysis (ICA) of 61-channel EEG recordings could separate CI-related artifacts from auditory-evoked potentials (AEPs), even though it was the perfectly time-locked CI stimulation that caused the AEPs. AEP dipole source localization revealed contralaterally larger amplitudes in the P1-N1 range, similar to normal hearing individuals. In contrast to normal hearing individuals, the man with the CI showed a 20-ms shorter N1 latency ipsilaterally. We conclude that ICA allows the detailed study of AEPs in CI users.
auditory evoked potential, cochlear implant, independent component analysis, dipole source analysis, N1
20-24
Debener, Stefan
e6bf9143-09a8-45c0-8536-3564885375d4
Hine, Jemma
b9836ea3-bf71-406c-98c9-d8ab8fe1daa2
Bleeck, Stefan
c888ccba-e64c-47bf-b8fa-a687e87ec16c
Eyles, Julie
183486b3-50e3-4dc2-a4cb-ab04023cb83e
January 2008
Debener, Stefan
e6bf9143-09a8-45c0-8536-3564885375d4
Hine, Jemma
b9836ea3-bf71-406c-98c9-d8ab8fe1daa2
Bleeck, Stefan
c888ccba-e64c-47bf-b8fa-a687e87ec16c
Eyles, Julie
183486b3-50e3-4dc2-a4cb-ab04023cb83e
Abstract
Little is known about how the auditory cortex adapts to artificial input as provided by a cochlear implant (CI). We report the case of a 71-year-old profoundly deaf man, who has successfully used a unilateral CI for 4 years. Independent component analysis (ICA) of 61-channel EEG recordings could separate CI-related artifacts from auditory-evoked potentials (AEPs), even though it was the perfectly time-locked CI stimulation that caused the AEPs. AEP dipole source localization revealed contralaterally larger amplitudes in the P1-N1 range, similar to normal hearing individuals. In contrast to normal hearing individuals, the man with the CI showed a 20-ms shorter N1 latency ipsilaterally. We conclude that ICA allows the detailed study of AEPs in CI users.
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e-pub ahead of print date: 2 October 2007
Published date: January 2008
Keywords:
auditory evoked potential, cochlear implant, independent component analysis, dipole source analysis, N1
Organisations:
Human Sciences Group
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Local EPrints ID: 337603
URI: http://eprints.soton.ac.uk/id/eprint/337603
ISSN: 0048-5772
PURE UUID: a56a77f3-cf26-4f60-871f-f585651bfdad
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Date deposited: 01 May 2012 08:59
Last modified: 15 Mar 2024 03:25
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Author:
Stefan Debener
Author:
Jemma Hine
Author:
Julie Eyles
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