Distinct criticality of phase and amplitude dynamics in the resting brain

作者：Daffertshofer Andreas^*; Ton Robert; Kringelbach Morten L; Woolrich Mark; Deco Gustavo

来源：NeuroImage, 2018, 180: 442-447.

DOI：10.1016/j.neuroimage.2018.03.002

• Power laws
• Criticality
• DFA
• Amplitude
• Phase

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 sourcereconstructed 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.

• 出版日期2018-10-15