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Functional motor mapping using cortico-kinetic coherence

par Bourguignon, Mathieu ;De Tiege, Xavier ;Op De Beeck, Marc ;Pirotte, Benoît ;Van Bogaert, Patrick ;Goldman, Serge ;Hari, Riitta;Jousmaki, Veikko
Editeur scientifique Supek, S;Susac, A
Référence 17th International Conference on Biomagnetism Advances in Biomagnetism, BIOMAG2010, IFMBE Proceedings, Vol. 28, page (310-313)
Publication Publié, 2010

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Résumé :

We present a novel method, corticokinetic coher ence, for functional motor mapping by computing coherence between cortical magnetoencephalographic (MEG) signals and the kinetics of voluntary movements. Six subjects performed during an MEG recording self-paced flexion-extensions of the right-hand fingers at about 3 Hz, with a 3-axis accelerometer attached to the index finger. Cumulant density and coherence spectra were computed between the MEG and accelerometer signals. Six subjects performed during an MEG recording selfpaced flexion-extensions of the right-hand fingers at about 3 Hz, with a 3-axis accelerometer attached to the index finger. Cumulant density and coherence spectra were computed between the MEG and accelerometer signals. In all subjects, accelerometer and coherence spectra showed peaks around 3-4 Hz and 6-8 Hz, corresponding to the movement frequencies. Coherence values (range 0.32-0.77; mean 0.55) exceeded the statistical threshold in all subjects. The sources of the coherent MEG signals, found during peaks of the cumulant density, were located in the left rolandic sulcus, at the hand motor area. Corticokinetic coherence appears to be a promising and robust tool for reliable and convenient functional mapping of the human motor cortex.