Validation of ica for attenuating cochlear implant artefacts from EEG recordings

Abstract

Event Abstract Back to Event Validation of ica for attenuating cochlear implant artefacts from EEG recordings Filipa C. Viola1*, Jeremy D. Thorne1, Julie Eyles2, Stefan Bleeck2 and Stefan Debener1, 3 1 Neuropsychology Lab, Dept. of Psychology, Germany 2 Institute for Sound and Vibration Research, Germany 3 Biomagnetic Center, Department of Neurology, University Hospital Jena, Germany Cochlear implants (CI) allow deaf individuals to recover a large amount of hearing function. Auditory evoked potentials (AEPs) are one objective and non-invasive way of assessing auditory cortex function after implantation, but the recordings are typically contaminated by an electrical artifact produced by the CI device. It has been reported that independent component analysis (ICA) can attenuate the CI artifact, allowing the recovery of AEPs from electroencephalogram (EEG) data. The goal here was to further assess the sensitivity of ICA for attenuating CI artifacts and its specificity for preserving AEPs. EEG data were collected from 18 adult CI users presented with auditory and visual stimuli and age-matched normal controls. ICA sensitivity was quantified by computing the amount of artifact attenuation. ICA specificity was assessed with a hybrid simulation study where CI artifacts were added to the EEG of normal hearing (NH) listeners. In addition, visual evoked potentials were compared before and after CI artifact attenuation. The quality of the CI users recovered AEPs was evaluated based on a signal to noise ratio (SNR) measure and compared to the control group. The results indicated good ICA sensitivity and specificity. AEPs with a reasonable SNR could be recovered from most CI users. Moreover, significant correlations between AEPs and age were obtained for both CI users (r = -.66) and NH controls (r = -.58), suggesting that individual differences were well preserved. CI users with poor SNR were characterised by a significantly longer period of deafness prior to implantation, suggesting incomplete reversal of deprivation-induced cortical reorganization. Taken together, the results support the validity of ICA for the study of AEPS in CI users. Funding: FCV was funded by the Fundacao para a Ciencia e Tecnologia, Lisbon Portugal (SFRH/BD/37662/2007). Keywords: brain oscillations, Cochlear Implants Conference: XI International Conference on Cognitive Neuroscience (ICON XI), Palma, Mallorca, Spain, 25 Sep - 29 Sep, 2011. Presentation Type: Poster Presentation Topic: Poster Sessions: Quantitative Analysis of EEG, MEG & Brain Oscillations Citation: Viola FC, Thorne JD, Eyles J, Bleeck S and Debener S (2011). Validation of ica for attenuating cochlear implant artefacts from EEG recordings. Conference Abstract: XI International Conference on Cognitive Neuroscience (ICON XI). doi: 10.3389/conf.fnhum.2011.207.00135 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 17 Nov 2011; Published Online: 28 Nov 2011. * Correspondence: Dr. Filipa C Viola, Neuropsychology Lab, Dept. of Psychology, Oldenburg, Germany, filipa.viola@uni-oldenburg.de Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Filipa C Viola Jeremy D Thorne Julie Eyles Stefan Bleeck Stefan Debener Google Filipa C Viola Jeremy D Thorne Julie Eyles Stefan Bleeck Stefan Debener Google Scholar Filipa C Viola Jeremy D Thorne Julie Eyles Stefan Bleeck Stefan Debener PubMed Filipa C Viola Jeremy D Thorne Julie Eyles Stefan Bleeck Stefan Debener Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.