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Measuring phase synchronization of superimposed signals

: Meinecke, F.C.; Ziehe, A.; Kurths, J.; Müller, K.-R.


Physical review letters 94 (2005), No.8, Art. 084102
ISSN: 0031-9007
ISSN: 1079-7114
Journal Article
Fraunhofer FIRST ()

Phase synchronization is an important phenomenon that occurs in a wide variety of complex oscillatory processes. Measuring phase synchronization can therefore help to gain fundamental insight into nature. In this Letter we point out that synchronization analysis techniques can detect spurious synchronization, if they are fed with a superposition of signals such as in electroencephalography or magnetoencephalography data. We show how techniques from blind source separation can help to nevertheless measure the true synchronization and avoid such pitfalls.