### Asset Details

• Description:
• Fixed one of the original source time courses {x(tp)}p=1P\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\{ {\varvec{x}}(t_p)\}_{p=1}^P$$\end{document}, in the top panel, we plot the voxelwise amplitude averaged over time of the neural sources reconstructed from the EEG data generated setting γ1=1/41-γ2\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\gamma _{1} = 1/4\left( {1 - \gamma _{2} } \right)$$\end{document}, where γ2=1/8\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\gamma _{2} = 1/8$$\end{document}. Blue circles and lines represent locations and orientations of the dipoles of interest. In the second panel, we plot the ROIs defined to reduce the number of time series used for the connectivity analysis. Eventually, in the last two rows we show the estimated connectivity measures for two pairs of ROIs. In each panel we plot the theoretical values of the measure (black line) and the values estimated from the original source time courses (dotted line) and from the reconstructed source activities obtained from EEG data simulated with different values of γ1\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\gamma _1$$\end{document} (coloured lines). We observe that when there is no connectivity the computed values of fGC are close to zero in all the conditions (bottom right panel)
• Rights Managed
• Rights Holder:
• Springer Nature
• License Rights Holder:
• © Springer Science+Business Media, LLC, part of Springer Nature 2017
• Asset Type:
• Image
• Asset Subtype:
• Chart/Graph
• Image Orientation:
• Portrait
• Image Dimensions:
• 681 x 1064
• Image File Size:
• 155 KB
• Creator:
• Sara Sommariva, Alberto Sorrentino, Michele Piana, Vittorio Pizzella, Laura Marzetti
• Credit:
• Sommariva, S., Sorrentino, A., Piana, M., Pizzella, V., & Marzetti, L. (2017). A Comparative Study of the Robustness of Frequency-Domain Connectivity Measures to Finite Data Length. Brain Topography, 32(4), 675-695. https://doi.org/10.1007/s10548-017-0609-4.
• Collection:
• Keywords:
• Dynamic functional connectivity, Imaginary part of coherency, Generalized partial directed coherence, Frequency-domain granger causality, Surrogate data, EEG
• Restrictions:
• Property Release:
• No
• Model Release:
• No
• Purchasable:
• Yes
• Sensitive Materials:
• No
• Article Authors:
• Sara Sommariva, Alberto Sorrentino, Michele Piana, Vittorio Pizzella, Laura Marzetti
• Article Copyright Year:
• 2017
• Publication Volume:
• 32
• Publication Issue:
• 4
• Publication Date:
• 11/22/2017
• DOI:
• https://doi.org/10.1007/s10548-017-0609-4

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