Modeling sparse connectivity between underlying brain sources for EEG/MEG

Details Modeling sparse connectivity between underlying brain sources for EEG/MEG Modeling sparse connectivity between underlying brain sources for EEG/MEG

2009-12-12

arxiv.org/abs/0912.2412v1

IEEE Trans. Biomed. Eng. 57(8) (2010) 1954 - 1963;

Statistics

Methodology

9 pages, 6 figures

Scientific paper

10.1109/TBME.2010.2046325

We propose a novel technique to assess functional brain connectivity in EEG/MEG signals. Our method, called Sparsely-Connected Sources Analysis (SCSA), can overcome the problem of volume conduction by modeling neural data innovatively with the following ingredients: (a) the EEG is assumed to be a linear mixture of correlated sources following a multivariate autoregressive (MVAR) model, (b) the demixing is estimated jointly with the source MVAR parameters, (c) overfitting is avoided by using the Group Lasso penalty. This approach allows to extract the appropriate level cross-talk between the extracted sources and in this manner we obtain a sparse data-driven model of functional connectivity. We demonstrate the usefulness of SCSA with simulated data, and compare to a number of existing algorithms with excellent results.

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