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A Comparison of Surrogate Tests for Phase Synchronization Analysis of Neural Signals

机译：神经信号相位同步分析的替代测试的比较

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Various studies show that advanced cognitive function is integrated by multiple interacted cortical regions. To investigate this mechanism, various measures, such as phase synchronization (PS) and partial directed coherence, has been applied to evaluate the pattern of neural connectivity among brain regions. However, some problems on quantifying neural connectivity are still open to be answered. For example, how to determine whether an estimated PS index (PSI) is significant big or not? Surrogate test is one main way to provide a threshold of significance for reference. Though many surrogate methods have been proposed, but which one is more suitable for PS analysis is not known yet. To deal with this question, this study performed a comparison of surrogate tests for the mean phase coherence based PSI with Electroencephalography (EEG) signals. Four different surrogate methods were compared, and results showed that among these methods, the rank-shuffled surrogate method is the most suitable one in providing significance test for PS analysis.
机译：各种研究表明，高级的认知功能是由多个相互作用的皮质区域整合而成的。为了研究这种机制，已采用各种措施（例如相位同步（PS）和部分定向相干性）来评估大脑区域之间的神经连通性模式。但是，关于量化神经连通性的一些问题仍未解决。例如，如何确定估计的PS指数（PSI）是否很大？替代测试是提供重要阈值以供参考的一种主要方法。尽管已经提出了许多替代方法，但是还不知道哪种方法更适合PS分析。为了解决这个问题，本研究对基于平均相干性的PSI与脑电图（EEG）信号的替代测试进行了比较。比较了四种不同的替代方法，结果表明，在这些方法中，按次序改组的替代方法是最适合为PS分析提供显着性检验的一种方法。

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