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Original Research ARTICLE

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Front. Neurosci., 07 May 2012 | doi: 10.3389/fnins.2012.00065

Reaching movement onset- and end-related characteristics of EEG spectral power modulations

  • 1 Neurobiology and Animal Physiology, Faculty of Biology I, University of Freiburg, Freiburg, Germany
  • 2 Bernstein Center Freiburg, University of Freiburg, Freiburg, Germany
  • 3 Department of Bioengineering, Imperial College London, London, UK
  • 4 Department of Electrical and Electronic Engineering, Imperial College London, London, UK
  • 5 Epilepsy Center, University Medical Center Freiburg, Freiburg, Germany
  • 6 Neurobiology and Biophysics, Faculty of Biology III, University of Freiburg, Freiburg, Germany

The spectral power of intracranial field potentials shows movement-related modulations during reaching movements to different target positions that in frequencies up to the high-γ range (approximately 50 to above 200 Hz) can be reliably used for single-trial inference of movement parameters. However, identifying spectral power modulations suitable for single-trial analysis for non-invasive approaches remains a challenge. We recorded non-invasive electroencephalography (EEG) during a self-paced center-out and center-in arm movement task, resulting in eight reaching movement classes (four center-out, four center-in). We found distinct slow (≤5 Hz), μ (7.5–10 Hz), β (12.5–25 Hz), low-γ (approximately 27.5–50 Hz), and high-γ (above 50 Hz) movement onset- and end-related responses. Movement class-specific spectral power modulations were restricted to the β band at approximately 1 s after movement end and could be explained by the sensitivity of this response to different static, post-movement electromyography (EMG) levels. Based on the β band, significant single-trial inference of reaching movement endpoints was possible. The findings of the present study support the idea that single-trial decoding of different reaching movements from non-invasive EEG spectral power modulations is possible, but also suggest that the informative time window is after movement end and that the informative frequency range is restricted to the β band.

Keywords: EEG, reaching, beta, gamma, movement onset, movement end, BMI, BCI

Citation: Demandt E, Mehring C, Vogt K, Schulze-Bonhage A, Aertsen A and Ball T (2012) Reaching movement onset- and end-related characteristics of EEG spectral power modulations. Front. Neurosci. 6:65. doi: 10.3389/fnins.2012.00065

Received: 08 March 2012; Paper pending published: 30 March 2012;
Accepted: 16 April 2012; Published online: 07 May 2012.

Edited by:

Cuntai Guan, Institute for Infocomm Research, Singapore

Reviewed by:

Dennis J. McFarland, Wadsworth Center for Laboratories and Research, USA
Jose L. ‘Pepe’ Contreras-Vidal, University of Houston, USA

Copyright: © 2012 Demandt, Mehring, Vogt, Schulze-Bonhage, Aertsen and Ball. This is an open-access article distributed under the terms of the Creative Commons Attribution Non Commercial License, which permits non-commercial use, distribution, and reproduction in other forums, provided the original authors and source are credited.

*Correspondence: Tonio Ball, Epilepsy Center, University Medical Center Freiburg, Engelbergerstr. 21, 79106 Freiburg, Germany. e-mail: tonio.ball@uniklinik-freiburg.de

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