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

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<mark>Journal publication date</mark>02/2008
<mark>Journal</mark>Physical review letters
Issue number8
Pages (from-to)084101
Publication statusPublished
Original languageEnglish


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.