Volume 87, Number 1, July 2009
|Number of page(s)||5|
|Published online||17 July 2009|
Detection of time-delayed interactions in biosignals using symbolic coupling traces
Department of Physics, Humboldt-Universität zu Berlin - Berlin, Germany, EU
2 Institute for Applied Computer Science, Forschungszentrum Karlsruhe GmbH - Karlsruhe, Germany, EU
3 Potsdam Institute for Climate Impact Research - Potsdam, Germany, EU
4 Department of Sleep Medicine, Charité Universitätsmedizin Berlin - Berlin, Germany, EU
Accepted: 16 June 2009
Directional coupling analysis of bivariate time series is an important subject of current research. In this letter, a method based on symbolic dynamics for the detection of time-delayed coupling is presented. The symbolic coupling traces, defined as the symmetric and diametric traces of the bivariate word distribution, allow for the quantification of coupling and are compared with established methods like mutual information and cross recurrence analysis. The symbolic coupling traces method is applied to model systems and cardiological data which demonstrate its advantages especially for nonstationary data.
PACS: 05.45.-a – Nonlinear dynamics and chaos / 05.45.Tp – Time series analysis / 87.19.Hh – Cardiac dynamics
© EPLA, 2009
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