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Direction of coupling from phases of interacting oscillators: A permutation information approach.

Research output: Contribution to journalJournal article

Published

Journal publication date02/2008
JournalPhysical Review Letters
Journal number8
Volume100
Pages084101
Original languageEnglish

Abstract

We introduce a directionality index for a time series based on a comparison of neighboring values. It can distinguish unidirectional from bidirectional coupling, as well as reveal and quantify asymmetry in bidirectional coupling. It is tested on a numerical model of coupled van der Pol oscillators, and applied to cardiorespiratory data from healthy subjects. There is no need for preprocessing and fine-tuning the parameters, which makes the method very simple, computationally fast and robust.