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22 results on '"O'Neill, George"'

7. The role of transient spectral ‘bursts’ in functional connectivity: A magnetoencephalography study

Author

Seedat, Zelekha A., primary, Quinn, Andrew J., additional, Vidaurre, Diego, additional, Liuzzi, Lucrezia, additional, Gascoyne, Lauren E., additional, Hunt, Benjamin A.E., additional, O’Neill, George C., additional, Pakenham, Daisie O., additional, Mullinger, Karen J., additional, Morris, Peter G., additional, Woolrich, Mark W., additional, and Brookes, Matthew J., additional

Published
2020
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12. Dynamic recruitment of resting state sub-networks

Author

O'Neill, George C., Bauer, Markus, Woolrich, Mark W., Morris, Peter G., Barnes, Gareth R., and Brookes, Matthew J.

Subjects
Adult, Male, Recruitment, Neurophysiological, Rest, Cognitive Neuroscience, Motor Cortex, Magnetoencephalography, Reproducibility of Results, Somatosensory Cortex, Article, Young Adult, Memory, Short-Term, Neurology, Connectome, Humans, Female, Nerve Net, Psychomotor Performance
Abstract

Resting state networks (RSNs) are of fundamental importance in human systems neuroscience with evidence suggesting that they are integral to healthy brain function and perturbed in pathology. Despite rapid progress in this area, the temporal dynamics governing the functional connectivities that underlie RSN structure remain poorly understood. Here, we present a framework to help further our understanding of RSN dynamics. We describe a methodology which exploits the direct nature and high temporal resolution of magnetoencephalography (MEG). This technique, which builds on previous work, extends from solving fundamental confounds in MEG (source leakage) to multivariate modelling of transient connectivity. The resulting processing pipeline facilitates direct (electrophysiological) measurement of dynamic functional networks. Our results show that, when functional connectivity is assessed in small time windows, the canonical sensorimotor network can be decomposed into a number of transiently synchronising sub-networks, recruitment of which depends on current mental state. These rapidly changing sub-networks are spatially focal with, for example, bilateral primary sensory and motor areas resolved into two separate sub-networks. The likely interpretation is that the larger canonical sensorimotor network most often seen in neuroimaging studies reflects only a temporal aggregate of these transient sub-networks. Our approach opens new frontiers to study RSN dynamics, showing that MEG is capable of revealing the spatial, temporal and spectral signature of the human connectome in health and disease., Highlights • The sensorimotor network consists of a series of transiently synchronising subnetworks. • These subnetworks are robust across multiple tasks. • The occurrence of these subnetworks is modulated by the current mental state.

Published
2015
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