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Localization of brain electrical activity sources and hemodynamic activity foci during motor imagery

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Abstract

The sources of brain activity that make the maximum contribution to EEG patterns corresponding to motor imagery have been studied. The accuracy of their classification determines the efficiency of brain-computer interface (BCI) for controlling external technical devices directly by brain signals, without the involvement of muscle activity. Brain activity sources are identified by independent component analysis. The independent components providing the maximum BCI classification accuracy are considered relevant for the motor imagery task. The two most relevant sources exhibit clearly marked event-related desynchronization and synchronization of the μ-rhythm during the imagery of contra- and ipsilateral hand movements. These sources were localized by solving the inverse EEG problem with due consideration for individual geometry of the brain and its covers, as determined by magnetic resonance imaging. Each of the sources was shown to be localized in the 3a area of the primary somatosensory cortex corresponding to proprioceptive sensitivity of the contralateral hand. Their positions were close to the foci of BOLD activity obtained by fMRI.

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Authors and Affiliations

  1. Institute for Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, ul. Butlerova 5a, Moscow, 117865, Russia

    A. A. Frolov, P. D. Bobrov & O. A. Mokienko

  2. Institute of Informatics, Academy of Sciences of the Czech Republic, Radlicka 5, Prague 5, 158 00, Czech Republic

    D. Husek

  3. Technical University of Ostrava, 17 Listopadu 2172/15, 708 00, Ostrava-Poruba, Czech Republic

    A. A. Frolov & P. D. Bobrov

  4. Scientific Center of Neurology, Russian Academy of Medical Sciences, Volokolamskoye sh. 80, Moscow, 125367, Russia

    O. A. Mokienko, L. A. Chernikova & R. N. Konovalov

  5. Pirogov Russian National Research Medical University, ul. Ostrovityanova 1, Moscow, 117997, Russia

    O. A. Mokienko & L. A. Chernikova

Authors
  1. A. A. Frolov
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  2. D. Husek
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  3. P. D. Bobrov
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  4. O. A. Mokienko
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  5. L. A. Chernikova
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  6. R. N. Konovalov
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Corresponding author

Correspondence to A. A. Frolov.

Additional information

Original Russian Text © A.A. Frolov, D. Husek, P.D. Bobrov, O.A. Mokienko, L.A. Chernikova, R.N. Konovalov, 2014, published in Fiziologiya Cheloveka, 2014, Vol. 40, No. 3, pp. 45–56.

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Frolov, A.A., Husek, D., Bobrov, P.D. et al. Localization of brain electrical activity sources and hemodynamic activity foci during motor imagery. Hum Physiol 40, 273–283 (2014). https://doi.org/10.1134/S0362119714030062

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  • DOI: https://doi.org/10.1134/S0362119714030062

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