An FFT based measure of phase synchronization

Details An FFT based measure of phase synchronization An FFT based measure of phase synchronization

2006-12-04

arxiv.org/abs/q-bio/0612004v4

Biology

Quantitative Biology

Neurons and Cognition

12 pages, 5 figures. Revised draft (substantial revision). Under review in a journal

Scientific paper

In this paper phase of a signal has been viewed from a different angle. According to this view a signal can have countably infinitely many phases, one associated with each Fourier component. In other words each frequency has a phase associated with it. It has been shown that if two signals are phase synchronous then the difference between phases at a given component changes very slowly across the subsequent components. This leads to an FFT based phase synchronization measuring algorithm between any two signals. The algorithm does not take any more time than the FFT itself. Mathematical motivations as well as some results of implementation of the algorithm on artificially generated signals and real EEG signals have been presented.

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