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Wavelet Analysis as a Tool for Investigating Movement-Related Cortical Oscillations in EEG-fMRI Coregistration

Brain Topography volume 23, pages 46–57 (2010)Cite this article

Abstract

Electroencephalography combined with functional magnetic resonance imaging (EEG-fMRI) identifies blood oxygenation level dependent (BOLD) signal changes associated with physiological and pathological EEG events. In this study we used EEG-fMRI to determine the possible correlation between topographical movement-related EEG changes in brain oscillatory activity recorded from EEG electrodes over the scalp and fMRI cortical responses in motor areas during finger movement. Thirty-two channels of EEG were recorded in 12 subjects during eyes-closed condition inside a three T magnetic resonance (MR) scanner using an MR-compatible EEG recording system. Off-line MRI artifact subtraction software was applied to obtain continuous EEG data during fMRI acquisition. For EEG data analysis we used a time–frequency approach to measure time by varying the energy in a signal at a given frequency band by the convolution of the EEG signal with a wavelet family in the alpha and beta bands. The correlation between the BOLD signal associated with the EEG regressor provides that sensory motor region is a source of the EEG. We conclude that combined EEG-fMRI can be used to investigate movement-related oscillations of the human brain inside an MRI scanner and wavelet analysis adds further details on the EEG changes. The movement-related changes in the EEG signals are useful to identify the brain activation sources responsible for BOLD-signal changes.

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Affiliations

  1. Department of Neurological and Vision Sciences, Section of Neurological rehabilitation, University of Verona, Verona, Italy

    Silvia Francesca Storti, Emanuela Formaggio, Antonio Fiaschi & Paolo Manganotti

  2. Policlinico “Gianbattista Rossi”, Università di Verona, P.le Scuro, 37134, Verona, Italia

    Silvia Francesca Storti, Emanuela Formaggio, Antonio Fiaschi & Paolo Manganotti

  3. Department of Information Engineering, University of Padova, Padova, Italy

    Emanuela Formaggio

  4. Department of Neurosurgery, Section of Neuroradiology, University of Verona, Verona, Italy

    Alberto Beltramello

  5. IRCCS “San Camillo” Hospital, Venice, Italy

    Antonio Fiaschi & Paolo Manganotti

Authors
  1. Silvia Francesca Storti
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  2. Emanuela Formaggio
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  3. Alberto Beltramello
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  4. Antonio Fiaschi
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  5. Paolo Manganotti
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Correspondence to Silvia Francesca Storti.

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Storti, S.F., Formaggio, E., Beltramello, A. et al. Wavelet Analysis as a Tool for Investigating Movement-Related Cortical Oscillations in EEG-fMRI Coregistration. Brain Topogr 23, 46–57 (2010). https://doi.org/10.1007/s10548-009-0117-2

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  • DOI: https://doi.org/10.1007/s10548-009-0117-2

Keywords

  • EEG
  • BOLD
  • Wavelet analysis
  • Wavelet energy
  • Maps