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Localization of class-related mu-rhythm desynchronization in motor imagery based Brain-Computer Interface sessions

: Haufe, S.; Tomioka, R.; Dickhaus, T.; Sannelli, C.; Blankertz, B.; Nolte, G.; Müller, K.-R.


Institute of Electrical and Electronics Engineers -IEEE-; IEEE Engineering in Medicine and Biology Society -EMBS-:
32nd Annual International Conference of the IEEE Engineering in Medicine and Biology Society, EMBS 2010 : August 31 - September 4, 2010. Sheraton Hotel, Buenos Aires, Argentina
New York, NY: IEEE, 2010
ISBN: 978-1-4244-4123-5 (Print)
ISBN: 978-4244-4124-2 (Online)
pp.5137-5140 (Vol.9)
Engineering in Medicine and Biology Society (EMBS International Conference) <32, 2010, Buenos Aires>
Conference Paper
Fraunhofer FIRST ()

We localize the sources of class-dependent eventrelated desynchronisation (ERD) of the mu-rhythm related to different types of motor imagery in Brain-Computer Interfacing (BCI) sessions. Our approach is based on localization of singletrial Fourier coefficients using sparse basis field expansions (SFLEX). The analysis reveals focal sources in the sensorimotor cortices, a finding which can be regarded as a proof for the expected neurophysiological origin of the BCI control signal. As a technical contribution, we extend S-FLEX to the multiple measurement case in a way that the activity of different frequency bins within the mu-band is coherently localized.