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Robust MEG Source Localization of Event Related Potentials: Identifying Relevant Sources by Non-Gaussianity

2006

Conference Paper

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Independent Component Analysis (ICA) is a frequently used preprocessing step in source localization of MEG and EEG data. By decomposing the measured data into maximally independent components (ICs), estimates of the time course and the topographies of neural sources are obtained. In this paper, we show that when using estimated source topographies for localization, correlations between neural sources introduce an error into the obtained source locations. This error can be avoided by reprojecting ICs onto the observation space, but requires the identification of relevant ICs. For Event Related Potentials (ERPs), we identify relevant ICs by estimating their non-Gaussianity. The efficacy of the approach is tested on auditory evoked potentials (AEPs) recorded by MEG. It is shown that ten trials are sufficient for reconstructing all important characteristics of the AEP, and source localization of the reconstructed ERP yields the same focus of activity as the average of 250 trials.

Author(s): Breun, P. and Grosse-Wentrup, M. and Utschick, W. and Buss, M.
Book Title: DAGM 2006
Journal: Pattern Recognition: 28th DAGM Symposium
Pages: 394-403
Year: 2006
Month: September
Day: 0
Editors: Franke, K. , K.-R. M{\"u}ller, B. Nickolay, R. Sch{\"a}fer
Publisher: Springer

Department(s): Empirical Inference
Bibtex Type: Conference Paper (inproceedings)

DOI: 10.1007/11861898_40
Event Name: 28th Annual Symposium of the German Association for Pattern Recognition
Event Place: Berlin

Address: Berlin, Germany
Digital: 0
Language: en
Organization: Max-Planck-Gesellschaft
School: Biologische Kybernetik

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BibTex

@inproceedings{4980,
  title = {Robust MEG Source Localization of Event Related Potentials: Identifying Relevant Sources by Non-Gaussianity},
  author = {Breun, P. and Grosse-Wentrup, M. and Utschick, W. and Buss, M.},
  journal = {Pattern Recognition: 28th DAGM Symposium},
  booktitle = {DAGM 2006},
  pages = {394-403},
  editors = {Franke, K. , K.-R. M{\"u}ller, B. Nickolay, R. Sch{\"a}fer},
  publisher = {Springer},
  organization = {Max-Planck-Gesellschaft},
  school = {Biologische Kybernetik},
  address = {Berlin, Germany},
  month = sep,
  year = {2006},
  month_numeric = {9}
}