Journal ArticleDOI
Evaluation of inverse methods and head models for EEG source localization using a human skull phantom.
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TLDR
Experimental results indicate that inverse methods using appropriate cortex-based source models are almost always able to locate the active source with excellent precision, with little or no spurious activity in close or distant regions, even when two sources are simultaneously active.Abstract:
We used a real-skull phantom head to investigate the performances of representative methods for EEG source localization when considering various head models. We describe several experiments using a montage with current sources located at multiple positions and orientations inside a human skull filled with a conductive medium. The robustness of selected methods based on distributed source models is evaluated as various solutions to the forward problem (from the sphere to the finite element method) are considered. Experimental results indicate that inverse methods using appropriate cortex-based source models are almost always able to locate the active source with excellent precision, with little or no spurious activity in close or distant regions, even when two sources are simultaneously active. Superior regularization schemes for solving the inverse problem can dramatically help the estimation of sparse and focal active zones, despite significant approximation of the head geometry and the conductivity properties of the head tissues. Realistic head models are necessary, though, to fit the data with a reasonable level of residual variance.read more
Citations
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Journal ArticleDOI
Parameterizing neural power spectra into periodic and aperiodic components.
Thomas Donoghue,Matar Haller,Erik J. Peterson,Paroma Varma,Priyadarshini Sebastian,Richard Gao,Torben Noto,Antonio H. Lara,Joni D. Wallis,Joni D. Wallis,Robert T. Knight,Robert T. Knight,Avgusta Y. Shestyuk,Bradley Voytek +13 more
TL;DR: An algorithm to parameterize electrophysiological neural power spectra as a combination of an aperiodic component and putative periodic oscillatory peaks is introduced, addressing limitations of common approaches.
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Magnetoencephalography for brain electrophysiology and imaging
TL;DR: A review of magnetoencephalography (MEG) among the techniques available to explore and resolve brain function and dysfunction can be found in this paper, where the authors identify and discuss current practical challenges, in particular in signal extraction and interpretation.
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EEG and MEG data analysis in SPM8.
Vladimir Litvak,Jérémie Mattout,Stefan J. Kiebel,Christophe Phillips,Richard N. Henson,James M. Kilner,Gareth R. Barnes,Robert Oostenveld,Jean Daunizeau,Guillaume Flandin,William D. Penny,Karl J. Friston +11 more
TL;DR: SPM8 is integrated with the FieldTrip toolbox, making it possible for users to combine a variety of standard analysis methods with new schemes implemented in SPM and build custom analysis tools using powerful graphical user interface (GUI) and batching tools.
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EEG Source Imaging: A Practical Review of the Analysis Steps.
Christoph M. Michel,Denis Brunet +1 more
TL;DR: This review explains several steps needed to pass from the recording of the EEG to 3-dimensional images of neuronal activity and illustrates them in a comprehensive analysis pipeline integrated in a stand-alone freely available academic software: Cartool.
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MEG: An introduction to methods.
TL;DR: This comprehensive introduction to MEG has brought together the leading researchers to provide the basic tools for planning and executing MEG experiments, as well as analyzing and interpreting the resulting data.
References
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Improved localizadon of cortical activity by combining eeg and meg with mri cortical surface reconstruction: A linear approach
Anders M. Dale,Martin I. Sereno +1 more
TL;DR: Model studies suggest that the author may be able to localize multiple cortical sources with spatial resolution as good as PET with this technique, while retaining a much finer grained picture of activity over time.
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Basic mathematical and electromagnetic concepts of the biomagnetic inverse problem
TL;DR: Basic mathematical and physical concepts of the biomagnetic inverse problem are reviewed with some new approaches and a weighted least-squares search with confidence limits and the method of minimum norm estimate are discussed.
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