Task-Evoked Dynamic Network Analysis Through Hidden Markov Modeling.
Andrew J. Quinn,Diego Vidaurre,Romesh G. Abeysuriya,Robert Becker,Anna C. Nobre,Mark W. Woolrich +5 more
TLDR
This work shows how the HMM can be inferred on continuous, parcellated source-space Magnetoencephalography (MEG) task data in an unsupervised manner, without any knowledge of the task timings, and reveals task-dependent HMM states that represent whole-brain dynamic networks transiently bursting at millisecond time scales as cognition unfolds.Citations
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Brain network dynamics in schizophrenia: Reduced dynamism of the default mode network.
Akhil Kottaram,Leigh A. Johnston,Luca Cocchi,Eleni P. Ganella,Eleni P. Ganella,Ian P. Everall,Christos Pantelis,Ramamohanarao Kotagiri,Andrew Zalesky +8 more
TL;DR: Severity of positive symptoms was associated with a longer proportion of time spent in states characterized by inactive default mode and executive networks, together with heightened activity in sensory networks, and classifiers trained on the state descriptors predicted individual diagnostic status with an accuracy of 76–85%.
Journal ArticleDOI
Replay bursts in humans coincide with activation of the default mode and parietal alpha networks
Cameron Higgins,Yunzhe Liu,Diego Vidaurre,Zeb Kurth-Nelson,Raymond J. Dolan,Raymond J. Dolan,Timothy E.J. Behrens,Mark W. Woolrich +7 more
TL;DR: Investigating whether replay coincided with spontaneous patterns of whole-brain activity found that replay sequences were packaged into transient bursts occurring selectively during activation of the default mode network (DMN) and parietal alpha networks.
Journal ArticleDOI
Tracking dynamic brain networks using high temporal resolution MEG measures of functional connectivity.
Prejaas Tewarie,Lucrezia Liuzzi,George C. O'Neill,Andrew J. Quinn,Alessandra Griffa,Mark W. Woolrich,Cornelis J. Stam,Arjan Hillebrand,Matthew J. Brookes +8 more
TL;DR: Simulations showed that high temporal resolution metrics of functional connectivity in conjunction with non-negative tensor factorisation outperformed conventional static connectivity metrics and sensitivity of the metrics was evaluated in resting-state magnetoencephalography, indicating the robustness of the current analysis.
Journal ArticleDOI
Synchronisation of Neural Oscillations and Cross-modal Influences
TL;DR: This review considers two mechanisms proposed to facilitate cross-modal influences on sensory processing, namely cross- modal phase resetting and neural entrainment, and considers how top-down processes may further influence cross-Modal processing in a flexible manner.
Journal ArticleDOI
The role of transient spectral ‘bursts’ in functional connectivity: A magnetoencephalography study
Zelekha A. Seedat,Andrew J. Quinn,Diego Vidaurre,Lucrezia Liuzzi,Lauren E. Gascoyne,Hunt Bae.,George C. O'Neill,Daisie O. Pakenham,Karen J. Mullinger,Peter G. Morris,Mark W. Woolrich,Matthew J. Brookes +11 more
TL;DR: A new approach to detect bursts in magnetoencephalography (MEG) data is used and it is shown that a time-delay embedded Hidden Markov Model (HMM) can be used to delineate single-region bursts which are in agreement with existing techniques.
References
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Fast and robust fixed-point algorithms for independent component analysis
TL;DR: Using maximum entropy approximations of differential entropy, a family of new contrast (objective) functions for ICA enable both the estimation of the whole decomposition by minimizing mutual information, and estimation of individual independent components as projection pursuit directions.
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TL;DR: The purpose of this tutorial paper is to give an introduction to the theory of Markov models, and to illustrate how they have been applied to problems in speech recognition.
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Beamforming: a versatile approach to spatial filtering
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TL;DR: An overview of beamforming from a signal-processing perspective is provided, with an emphasis on recent research.
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A multi-modal parcellation of human cerebral cortex
Matthew F. Glasser,Timothy S. Coalson,Emma C. Robinson,Emma C. Robinson,Carl D. Hacker,John W. Harwell,Essa Yacoub,Kamil Ugurbil,Jesper L. R. Andersson,Christian F. Beckmann,Mark Jenkinson,Stephen Smith,David C. Van Essen +12 more
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