当前位置： SCI文献检索 > Frontiers in Physiology期刊下所有文献 > Resting state MEG oscillations show long-range temporal correlations of phase synchrony that break down during finger movement.

Resting state MEG oscillations show long-range temporal correlations of phase synchrony that break down during finger movement.

Abstract：

:The capacity of the human brain to interpret and respond to multiple temporal scales in its surroundings suggests that its internal interactions must also be able to operate over a broad temporal range. In this paper, we utilize a recently introduced method for characterizing the rate of change of the phase difference between MEG signals and use it to study the temporal structure of the phase interactions between MEG recordings from the left and right motor cortices during rest and during a finger-tapping task. We use the Hilbert transform to estimate moment-to-moment fluctuations of the phase difference between signals. After confirming the presence of scale-invariance we estimate the Hurst exponent using detrended fluctuation analysis (DFA). An exponent of >0.5 is indicative of long-range temporal correlations (LRTCs) in the signal. We find that LRTCs are present in the α/μ and β frequency bands of resting state MEG data. We demonstrate that finger movement disrupts LRTCs correlations, producing a phase relationship with a structure similar to that of Gaussian white noise. The results are validated by applying the same analysis to data with Gaussian white noise phase difference, recordings from an empty scanner and phase-shuffled time series. We interpret the findings through comparison of the results with those we obtained from an earlier study during which we adopted this method to characterize phase relationships within a Kuramoto model of oscillators in its sub-critical, critical, and super-critical synchronization states. We find that the resting state MEG from left and right motor cortices shows moment-to-moment fluctuations of phase difference with a similar temporal structure to that of a system of Kuramoto oscillators just prior to its critical level of coupling, and that finger tapping moves the system away from this pre-critical state toward a more random state.

journal_name

Front Physiol

journal_title

Frontiers in physiology

authors

Botcharova M,Berthouze L,Brookes MJ,Barnes GR,Farmer SF

doi

10.3389/fphys.2015.00183

subject

Has Abstract

pub_date

2015-06-17 00:00:00

pages

183

issn

1664-042X

journal_volume

pub_type

杂志文章

在线工具

Resting state MEG oscillations show long-range temporal correlations of phase synchrony that break down during finger movement.