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High precision anatomy for MEG
2014
NeuroImage
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Precise MEG estimates of neuronal current flow are undermined by uncertain knowledge of the head location with respect to the MEG sensors. ...
We show that at this level of coregistration accuracy there is strong evidence for anatomical models based on the individual rather than canonical anatomy; but that this advantage disappears for errors ...
Furthermore, we would like to thank Mark Tillotson and MEG International Services Ltd for supplying specific digital info on the CTF MEG system (dewar surface file, calibration coil locations), as well ...
doi:10.1016/j.neuroimage.2013.07.065
pmid:23911673
pmcid:PMC3898940
fatcat:uvsm3lxqc5d35fplhpf773bqw4
Dynamic functional connectivity
2007
Current Opinion in Neurobiology
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Pattern analysis methods now offer a principled way for constructing such network hierarchies. ...
I also thank Mari Aoki for help during the preparation of the manuscript and Daniel Palomo for redaction and helpful discussions. ...
Network models are attractive tools for studying brain organization: they provide a common framework for describing the connectivity of distinct brain areas at the level of anatomy and function, drawing ...
doi:10.1016/j.conb.2007.03.008
pmid:17379500
fatcat:4msvaswltbcgpnlyggftheqcnm
Automated detection of epileptic ripples in MEG using beamformer-based virtual sensors
2017
Journal of Neural Engineering
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We thank Sylvain Baillet and its group NeuroSpeed (Montreal Neurological Institute, McGill University) for the help and comments during the course of this research that greatly improved this work. ...
supported by the Ministry of Economy and Competitiveness (MINECO), Spain, under contract DPI2014-59049-R and the Ministry of Education, Culture and Sports (MECD) FPU12/05631 and Fundación BBVA grants for ...
The automatic analysis was performed in iEEG and the values for two thresholds were selected for MEG-VS to achieve a maximum F1 score; in other words, the weighted average of precision and recall measures ...
doi:10.1088/1741-2552/aa684c
pmid:28327467
fatcat:2zq5soxlazcg7lddlphqppxe3q
High-precision magnetoencephalography for reconstructing amygdalar and hippocampal oscillations during prediction of safety and threat
2019
Human Brain Mapping
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Here, we used high-precision magnetoencephalography (MEG) during human discriminant delay threat conditioning. ...
Our results suggest that high-precision MEG is sensitive to neural activity of the human amygdala and hippocampus during threat conditioning and shed light on the oscillation-mediated mechanisms underpinning ...
Here, we used headcasts to maximise SNR in order to get a precise estimate of a participant's anatomy with respect to the MEG sensors (Meyer, Bonaiuto, et al., 2017) . ...
doi:10.1002/hbm.24689
pmid:31257708
pmcid:PMC6772181
fatcat:fiseswzrlrdgxgqfkqwkfuiooi
Statistical power: implications for planning MEG studies
[article]
2019
bioRxiv
pre-print
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Statistical power is key for robust, replicable science. Here, we systematically explored how numbers of trials and subjects affect statistical power in MEG sensor-level data. ...
Finally, we note that this variation in detectability may also partly account for the over-representation of some fields of study over others in the MEG domain (e.g. sensorimotor and auditory studies). ...
In simulations constrained by individual brain anatomy, the distance to the closest sensor for a given source was measured on the individual anatomy in each subject . ...
doi:10.1101/852202
fatcat:2n4lzaj42jd5ng6u5n7ry5pida
Brainstorm: A User-Friendly Application for MEG/EEG Analysis
2011
Computational Intelligence and Neuroscience
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Brainstorm is a collaborative open-source application dedicated to magnetoencephalography (MEG) and electroencephalography (EEG) data visualization and processing, with an emphasis on cortical source estimation ...
The primary objective of the software is to connect MEG/EEG neuroscience investigators with both the best-established and cutting-edge methods through a simple and intuitive graphical user interface (GUI ...
Primary support also includes permanent site support from the Centre National de la Recherche Scientifique (CNRS, France) for the Cognitive Neuroscience and Brain Imaging Laboratory (La Salpêtrière Hospital ...
doi:10.1155/2011/879716
pmid:21584256
pmcid:PMC3090754
fatcat:kcxl65jo7rel3k4rj5umc62yde
Statistical power: implications for planning MEG studies
2021
NeuroImage
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Statistical power is key for robust, replicable science. Here, we systematically explored how numbers of trials and subjects affect statistical power in MEG sensor-level data. ...
We thus also performed simulations where we controlled spatial properties independently of individual anatomy. ...
Acknowledgments MC and NG work on the CENIR MEG-EEG platform at the Paris Brain Institute, which has received infrastructure funding from the programs " Investissements d'avenir" ANR-10-IAIHU-06 and ANR ...
doi:10.1016/j.neuroimage.2021.117894
pmid:33737245
fatcat:vdixgvbryrevtiggbygr467ncy
Redefining the role of Magnetoencephalography in refractory epilepsy
2020
Seizure
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using optically pumped magnetometers, as well as improved post processing of the data during interictal and ictal activity for accurate source localisation of the epileptogenic focus. ...
This review highlights the recent progress of MEG within epilepsy, including advances in the technique itself such as simultaneous EEG/MEG and intracranial EEG/MEG recording and room temperature MEG recording ...
MEG has been used to inform invasive intracranial electroencephalography planning, viewed as the gold standard for precise localisation of the epileptogenic zone, in up to a third of patients [7] with ...
doi:10.1016/j.seizure.2020.10.010
pmid:33096459
fatcat:4646un4tsbaihmlxktsohjstai
Adding dynamics to the Human Connectome Project with MEG
2013
NeuroImage
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High quality MEG data will be collected from 50 twin pairs both in the resting state and during performance of motor, working memory and language tasks. ...
Additionally, using the cortical parcellation scheme common to all imaging modalities, the HCP will provide processing pipelines for calculating connection matrices as a function of time and frequency. ...
Nevertheless BOLD activation maps with their high spatial resolution are used in many studies as priors for MEG inverse solutions. ...
doi:10.1016/j.neuroimage.2013.05.056
pmid:23702419
pmcid:PMC3784249
fatcat:2tj34hturfelthuhbcrxuivpfy
Quantifying the performance of MEG source reconstruction using resting state data
[article]
2018
bioRxiv
pre-print
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Here we validate a non-invasive method for quantifying the resolution of different inversion assumptions under different recording regimes (with and without head-casts) based on resting state MEG. ...
To test the anatomical precision that could be resolved through these transient states we then inverted these data onto libraries of systematically distorted, subject specific, cortical meshes and compared ...
Using this method, we demonstrate a notably high sensitivity (<4mm) to underlying 429 anatomical distortion and also provide evidence for the anatomical validity of cortical sources in 430 MEG source inversion ...
doi:10.1101/248252
fatcat:bcgvue4fx5dknhyh3vxyrjvec4
Transcranial electric stimulation (tES) and NeuroImaging: the state-of-the-art, new insights and prospects in basic and clinical neuroscience
2016
NeuroImage
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implications for evidence--based use of this technique in a clinical context. ...
Being an appealing tool to manipulate brain electric or magnetic activity to study its functional role, tES also promises to allow for purposeful modulation of brain function and behavior, with all associated ...
show that this model outperforms finite element models (FEM) of mismatched individual anatomies as well as the boundary element models (BEM) of the ICBM anatomy. ...
doi:10.1016/j.neuroimage.2016.08.020
pmid:27633745
fatcat:wi6p2vj2ofhn5koaaxfk6git3i
The value of magnetoencephalography for seizure-onset zone localization in magnetic resonance imaging-negative partial epilepsy
2013
Brain
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However, surgery is feasible if the seizure-onset zone is precisely delineated through intracranial electroencephalography recording. ...
Surgical treatment of epilepsy is a challenge for patients with non-contributive brain magnetic resonance imaging. ...
Funding Support to this study was provided through grants from the PHRC 27-11 (Programme Hospitalier de Recherche Clinique) 'High Frequency oscillations in Magneto-EncephaloGraphy (MEG): diagnostic usefulness ...
doi:10.1093/brain/awt213
pmid:24014520
pmcid:PMC3784280
fatcat:ub2hh654svcg3crjzohaaxtcq4
How to Detect Amygdala Activity with Magnetoencephalography using Source Imaging
2013
Journal of Visualized Experiments
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For instance, by using source imaging to model hippocampal activity, it may be possible recover MEG signal from hippocampal sources during tasks like spatial navigation. ...
By collecting highresolution MRI images of the subject's brain, it is possible to create a source model based on individual neural anatomy. ...
doi:10.3791/50212
pmid:23770774
pmcid:PMC3726041
fatcat:cpdibt5zzjcjnpkqw7ipzwqfhm
Assessment of Effective Network Connectivity among MEG None Contaminated Epileptic Transitory Events
2021
Computational and Mathematical Methods in Medicine
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We validated our technique on MEG signal using detector precision on 5 patients. ...
Clinical performance was interesting for entire methods providing in an average of 73.5% of active sources detected in depth and seen in MEG, and vice versa, about 77.15% of active sources were detected ...
Martine Gavaret for the useful discussions, detection, classification, and validation of interictal epileptiform discharges. The authors thank Pr. Said Noureddine Zerhouni (ENSMM Besançon, France). ...
doi:10.1155/2021/6406362
pmid:34992674
pmcid:PMC8727131
fatcat:buzbglrxgzamletimchcmuob7q
Optimising experimental design for MEG resting state functional connectivity measurement
2017
NeuroImage
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Our results provide important insights on experimental design and will prove valuable for future MEG connectivity studies. ...
Such robustness is critical if MEG measures in individual subjects are to prove clinically valuable. ...
Importantly (and perhaps counterintuitively) as SNR is increased, the requirement for high spatial precision also increases. ...
doi:10.1016/j.neuroimage.2016.11.064
pmid:27903441
fatcat:bounhk3dqbgzfpcwdiu4sw4fta
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