Can spurious indications for phase synchronization due to superimposed signals be avoided?
Can spurious indications for phase synchronization due to superimposed signals be avoided?
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DOI：
10.1063/1.4890568
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发表时间：
2014-09-01
期刊：
影响因子：
2.9
通讯作者：
Lehnertz, Klaus
中科院分区：
文献类型：
--
作者：
Porz, Stephan;Kiel, Matthaeus;Lehnertz, Klaus
我们研究了基于相位的方法的相对优点-平均相位相干性，未加权和加权相位滞后指数-用于估计受共同源和噪声影响的经验时间序列中动力系统之间相互作用的强度。通过数值分析耦合模型系统的相互作用动力学，我们比较了这些方法在不同模拟实验情况下区分不同耦合水平的能力。我们通过使用癫痫患者的颅内脑电图记录调查脑区域内和脑区域之间相互作用强度的一致性和时间变化来补充我们的数值研究。我们的研究结果表明，未加权和加权相位滞后指数不太容易受到共同来源的影响，但这种优势可能会限制这些方法的适用性。(C) 2014 AIP出版有限责任公司
We investigate the relative merit of phase-based methods-mean phase coherence, unweighted and weighted phase lag index-for estimating the strength of interactions between dynamical systems from empirical time series which are affected by common sources and noise. By numerically analyzing the interaction dynamics of coupled model systems, we compare these methods to each other with respect to their ability to distinguish between different levels of coupling for various simulated experimental situations. We complement our numerical studies by investigating consistency and temporal variations of the strength of interactions within and between brain regions using intracranial electroencephalographic recordings from an epilepsy patient. Our findings indicate that the unweighted and weighted phase lag index are less prone to the influence of common sources but that this advantage may lead to constrictions limiting the applicability of these methods. (C) 2014 AIP Publishing LLC.