The University of Southampton
University of Southampton Institutional Repository

Independent component analysis and source analysis of auditory evoked potentials for assessment of cochlear implant users

Independent component analysis and source analysis of auditory evoked potentials for assessment of cochlear implant users
Independent component analysis and source analysis of auditory evoked potentials for assessment of cochlear implant users
Source analysis of the Auditory Evoked Potential (AEP) has been used before to evaluate the maturation of the auditory system in both adult and children; in the same way, this technique could be applied to ongoing EEG recordings, in response to acoustic specific frequency stimuli, from children with cochlear implants (CI). This is done in oder to objectively assess the performance of this electronic device and the maturation of the child?s hearing. However, these recordings are contaminated by an artifact produced by the normal operation of the CI; this artifact in particular makes the detection and analysis of AEPs much harder and generates errors in the source analysis process. The artifact can be spatially filtered using Independent Component Analysis (ICA); in this research, three different ICA algorithms were compared in order to establish the more suited algorithm to remove the CI artifact. Additionally, we show that pre-processing the EEG recording, using a temporal ICA algorithm, facilitates not only the identification of the AEP peaks but also the source analysis procedure. From results obtained in this research and limited dataset of CI vs normal recordings, it is possible to conclude that the AEPs source locations change from the inferior temporal areas in the first 2 years after implantation to the superior temporal area after three years using the CIs, close to the locations obtained in normal hearing children. It is intended that the results of this research are used as an objective technique for a general evaluation of the performance of children with CIs.
Castaneda-Villa, N.
10f342b7-36b7-4f7b-864e-8a18a95730f6
Castaneda-Villa, N.
10f342b7-36b7-4f7b-864e-8a18a95730f6
James, C.J.
b3733b1f-a6a1-4c9b-b75c-6191d4142e52

Castaneda-Villa, N. (2009) Independent component analysis and source analysis of auditory evoked potentials for assessment of cochlear implant users. University of Southampton, Institute of Sound and Vibration Research, Doctoral Thesis, 278pp.

Record type: Thesis (Doctoral)

Abstract

Source analysis of the Auditory Evoked Potential (AEP) has been used before to evaluate the maturation of the auditory system in both adult and children; in the same way, this technique could be applied to ongoing EEG recordings, in response to acoustic specific frequency stimuli, from children with cochlear implants (CI). This is done in oder to objectively assess the performance of this electronic device and the maturation of the child?s hearing. However, these recordings are contaminated by an artifact produced by the normal operation of the CI; this artifact in particular makes the detection and analysis of AEPs much harder and generates errors in the source analysis process. The artifact can be spatially filtered using Independent Component Analysis (ICA); in this research, three different ICA algorithms were compared in order to establish the more suited algorithm to remove the CI artifact. Additionally, we show that pre-processing the EEG recording, using a temporal ICA algorithm, facilitates not only the identification of the AEP peaks but also the source analysis procedure. From results obtained in this research and limited dataset of CI vs normal recordings, it is possible to conclude that the AEPs source locations change from the inferior temporal areas in the first 2 years after implantation to the superior temporal area after three years using the CIs, close to the locations obtained in normal hearing children. It is intended that the results of this research are used as an objective technique for a general evaluation of the performance of children with CIs.

Text
P2643.pdf - Other
Download (7MB)

More information

Published date: June 2009
Additional Information: Signed permission form received to upload pdf
Organisations: University of Southampton

Identifiers

Local EPrints ID: 161079
URI: http://eprints.soton.ac.uk/id/eprint/161079
PURE UUID: fafb92f6-e799-4723-9f35-28cd6d169a38

Catalogue record

Date deposited: 16 Aug 2010 15:12
Last modified: 14 Mar 2024 01:59

Export record

Contributors

Author: N. Castaneda-Villa
Thesis advisor: C.J. James

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.

×