Cross-Correlation of motor activity signals from dc-magnetoencephalography, near-infrared spectroscopy, and electromyography

Authors:
Tilmann H. Sander;Stefanie Leistner;Heidrun Wabnitz;Bruno-Marcel Mackert;Rainer Macdonald;Lutz Trahms
Affiliations:
Division of Medical Physics, Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, Berlin, Germany;Department of Neurology, Charité Campus Benjamin Franklin, Berlin, Germany;Division of Medical Physics, Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, Berlin, Germany;Department of Neurology, Charité Campus Benjamin Franklin, Berlin, Germany and Department of Neurology, Vivantes Auguste Viktoria Klinikum, Berlin, Germany;Division of Medical Physics, Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, Berlin, Germany;Division of Medical Physics, Physikalisch-Technische Bundesanstalt, Abbestraße 2-12, Berlin, Germany
Venue:
Computational Intelligence and Neuroscience - Special issue on processing of brain signals by using hemodynamic and neuroelectromagnetic modalities
Year:
2010

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Abstract

Neuronal and vascular responses due to finger movements were synchronously measured using dc-magnetoencephalography (dcMEG) and time-resolved near-infrared spectroscopy (trNIRS). The finger movements were monitored with electromyography (EMG). Cortical responses related to the finger movement sequence were extracted by independent component analysis from both the dcMEG and the trNIRS data. The temporal relations between EMG rate, dcMEG, and trNIRS responses were assessed pairwise using the cross-correlation function (CCF), which does not require epoch averaging. A positive lag on a scale of seconds was found for the maximum of the CCF between dcMEG and trNIRS. A zero lag is observed for the CCF between dcMEG and EMG. Additionally this CCF exhibits oscillations at the frequency of individual finger movements. These findings show that the dcMEG with a bandwidth up to 8 Hz records both slow and faster neuronal responses, whereas the vascular response is confirmed to change on a scale of seconds.