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© Research
Publication : Biological research

Classification methods for ongoing EEG and MEG signals

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Biological research - 28 May 2008

Besserve M, Jerbi K, Laurent F, Baillet S, Martinerie J, Garnero L

Link to Pubmed [PMID] – 18575676

Biol. Res. 2007;40(4):415-37

Classification algorithms help predict the qualitative properties of a subject’s mental state by extracting useful information from the highly multivariate non-invasive recordings of his brain activity. In particular, applying them to Magneto-encephalography (MEG) and electro-encephalography (EEG) is a challenging and promising task with prominent practical applications to e.g. Brain Computer Interface (BCI). In this paper, we first review the principles of the major classification techniques and discuss their application to MEG and EEG data classification. Next, we investigate the behavior of classification methods using real data recorded during a MEG visuomotor experiment. In particular, we study the influence of the classification algorithm, of the quantitative functional variables used in this classifier, and of the validation method. In addition, our findings suggest that by investigating the distribution of classifier coefficients, it is possible to infer knowledge and construct functional interpretations of the underlying neural mechanisms of the performed tasks. Finally, the promising results reported here (up to 97% classification accuracy on 1-second time windows) reflect the considerable potential of MEG for the continuous classification of mental states.

https://www.ncbi.nlm.nih.gov/pubmed/18575676