Analysis of time-variant quadratic phase couplings in the trace alternant EEG by recursive estimation of 3rd-order time-frequency distributions
Analysis of time-variant quadratic phase couplings in the trace alternant EEG by recursive estimation of 3rd-order time-frequency distributions
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DOI：
10.1016/j.jneumeth.2006.04.012
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发表时间：
2006-10-15
影响因子：
3
通讯作者：
Witte, Herbert
中科院分区：
文献类型：
--
作者：
Helbig, Marko;Schwab, Karin;Witte, Herbert
瞬态二次相位耦合（QPC）的量化，通过时变双谱分析是一个有用的方法来解释信号分量之间的相互关系。提出了一种三阶时频分布的广义递推估计方法。基于三阶时频分布，可以得到双振幅（BA）、双相干（BC）和相位双相干（PBC）的时变估计。研究和比较了不同的平滑窗口和局部矩函数对估计性能的优化。该方法被应用到信号模拟和EEG信号，它可以表明，新的时变双谱分析的结果在一个可靠的量化QPC的轨迹交替EEG的健康新生儿。(c)2006 Elsevier B.V.保留所有权利。
The quantification of transient quadratic phase couplings (QPC) by means of time-variant bispectral analysis is a useful approach to explain several interrelations between signal components. A generalized recursive estimation approach for 3rd-order time-frequency distributions (3rd-order TFD) is introduced. Based on 3rd-order TFD, time-variant estimations of biamplitude (BA), bicoherence (BC) and phase bicoherence (PBC) can be derived. Different smoothing windows and local moment functions for an optimization of the estimation proper-ties are investigated and compared. The methods are applied to signal simulations and EEG signals, and it can be shown that the new time-variant bispectral analysis results in a reliable quantification of QPC in the trace alternant EEG of healthy neonates. (c) 2006 Elsevier B.V. All rights reserved.