Reliable recording and analysis of MEG-based corticokinematic coherence in the presence of strong magnetic artifacts.

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
Mathieu BourguignonDaniel Lundqvist

Abstract

Corticokinematic coherence (CKC) is the coupling between magnetoencephalographic (MEG) signals and limb kinematics during fast movements. Our objective was to assess the robustness of CKC-based identification of the primary sensorimotor (SM1) cortex of subjects producing strong magnetic artifacts when the MEG signals were cleaned with temporal signal space separation (tSSS). We recorded MEG during active and passive forefinger movements and during median-nerve stimulation in the following conditions: (1) artifact-free, (2) a magnetic wire attached to the scalp at C3 location, and (3) a magnetic wire attached behind the lower central incisors. Data were pre-processed with tSSS and analyzed using standard CKC methods, somatosensory evoked fields (SEFs), and dipole modeling. Artifacts were effectively suppressed by tSSS, enabling successful identification of the SM1 cortex in all subjects based on CKC and SEFs. The sources were in artifact conditions ∼5 mm away from the sources identified in artifact-free conditions. tSSS suppressed artifacts strongly enough to enable reliable identification of the SM1 cortex on the basis of CKC mapping, with localization accuracy comparable to SEF-based mapping. The results suggest that CKC can b...Continue Reading

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Citations

Jun 15, 2019·Neurology·Robert Joseph Thomas, Patrick J Morrison
Jul 3, 2018·Frontiers in Aging Neuroscience·Harri PiitulainenSimon Walker
Nov 10, 2020·Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society·Xavier De TiègeVeikko Jousmäki
Oct 29, 2020·Journal of Neurophysiology·Harri PiitulainenMathieu Bourguignon
Jan 27, 2021·NeuroImage·Gustavo Lucena GómezMathieu Bourguignon
Mar 22, 2021·NeuroImage·Paul de LangeMathieu Bourguignon

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