Daffertshofer, AndreasTon, RobertKringelbach, Morten L.Woolrich, MarkDeco, Gustavo2022-10-182022-10-182018Daffertshofer A, Ton R, Kringelbach ML, Woolrich M, Deco G. Distinct criticality of phase and amplitude dynamics in the resting brain. NeuroImage. 2018 Oct 15;180(Pt B):442-7. DOI: 10.1016/j.neuroimage.2018.03.0021053-8119http://hdl.handle.net/10230/54463Includes supplementary materials for the online appendix.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.application/pdfeng©2018 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).info:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.neuroimage.2018.03.002Power lawsCriticalityDFAAmplitudePhaseinfo:eu-repo/semantics/openAccess