Direction of coupling from phases of interacting oscillators: a permutation information approach.
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.
Bahraminasab
A
A
Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom.
Ghasemi
F
F
Stefanovska
A
A
McClintock
P V E
PV
Kantz
H
H
D000368:Aged; D001683:Biological Clocks; D002319:Cardiovascular System; D035641:Chest Wall Oscillation; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008955:Models, Cardiovascular; D015656:Respiratory Mechanics