Distinct criticality of phase and amplitude dynamics in the resting brain

Andreas Daffertshofer; Robert Ton; Morten L. Kringelbach; Mark Woolrich; Gustavo Deco

doi:10.1016/j.neuroimage.2018.03.002

Distinct criticality of phase and amplitude dynamics in the resting brain

Andreas Daffertshofer^*, Robert Ton, Morten L. Kringelbach, Mark Woolrich, Gustavo Deco

^*Corresponding author for this work

Research output: Contribution to Journal › Article › Academic › peer-review

Abstract

Converging research suggests that the resting brain operates at the cusp of dynamic instability, as signified by scale-free temporal correlations. We asked whether the scaling properties of these correlations differ between amplitude and phase fluctuations, which may reflect different aspects of cortical functioning. Using source-reconstructed magneto-encephalographic signals, we found power-law scaling for the collective amplitude and for phase synchronization, both capturing whole-brain activity. The temporal changes of the amplitude comprise slow, persistent memory processes, whereas phase synchronization exhibits less temporally structured and more complex correlations, indicating a fast and flexible coding. This distinct temporal scaling supports the idea of different roles of amplitude and phase fluctuations in cortical functioning.

Original language	English
Pages (from-to)	442-447
Number of pages	6
Journal	NeuroImage
Volume	180
Issue number	Part B
Early online date	9 Mar 2018
DOIs	https://doi.org/10.1016/j.neuroimage.2018.03.002
Publication status	Published - Oct 2018

Funding

We would like to thank Michael Breakspear for the challenging discussion and the valuable contributions to this study. We received the following funding: GD , RT: ERC Advanced Grant: DYSTRUCTURE (n. 295129 ), GD: Spanish Research Project PSI2013-42091-P , Human Brain Project (n. H2020-720270 ), and FP7-ICT BrainScales (n. 269921 ). MLK: ERC Consolidator Grant CAREGIVING (n. 615539 ) and TrygFonden Charitable Foundation. MW: Wellcome Trust and an MRC UK MEG Partnership Grant ( MR/K005464/1 ). AD: H2020-MSCA-ITN COSMOS (grant n. 642563 ). We would like to thank Michael Breakspear for the challenging discussion and the valuable contributions to this study. We received the following funding: GD, RT: ERC Advanced Grant: DYSTRUCTURE (n. 295129), GD: Spanish Research Project PSI2013-42091-P, Human Brain Project (n. H2020-720270), and FP7-ICT BrainScales (n. 269921). MLK: ERC Consolidator Grant CAREGIVING (n. 615539) and TrygFonden Charitable Foundation. MW: Wellcome Trust and an MRC UK MEG Partnership Grant (MR/K005464/1). AD: H2020-MSCA-ITN COSMOS (grant n. 642563).

Funders	Funder number
FP7-ICT Brainscales
MRC UK MEG	MR/K005464/1
TrygFonden Charitable Foundation
Seventh Framework Programme	615539, 295129, 269921, 642563, 720270
European Research Council	PSI2013-42091-P, H2020-720270

Keywords

Amplitude
Criticality
DFA
Phase
Power laws

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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abstract = "Converging research suggests that the resting brain operates at the cusp of dynamic instability, as signified by scale-free temporal correlations. We asked whether the scaling properties of these correlations differ between amplitude and phase fluctuations, which may reflect different aspects of cortical functioning. Using source-reconstructed magneto-encephalographic signals, we found power-law scaling for the collective amplitude and for phase synchronization, both capturing whole-brain activity. The temporal changes of the amplitude comprise slow, persistent memory processes, whereas phase synchronization exhibits less temporally structured and more complex correlations, indicating a fast and flexible coding. This distinct temporal scaling supports the idea of different roles of amplitude and phase fluctuations in cortical functioning.",

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Distinct criticality of phase and amplitude dynamics in the resting brain

Abstract

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Keywords

UN SDGs

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