Physics of brain dynamics: Fokker-Planck analysis reveals changes in EEG delta-theta interactions in anaesthesia

Bahraminasab, Alireza and Ghasemi, Fatemeh and Stefanovska, Aneta and McClintock, P.V.E. and Friedrich, R. (2009) Physics of brain dynamics: Fokker-Planck analysis reveals changes in EEG delta-theta interactions in anaesthesia. New Journal of Physics, 11 (10): 103051. ISSN 1367-2630

PDF (1367-2630_11_10_103051)
1367_2630_11_10_103051.pdf - Published Version
Available under License Creative Commons Attribution.
Download (1MB)

Abstract

We use drift and diffusion coefficients to reveal interactions between different oscillatory processes underlying a complex signal and apply the method to EEG delta and theta frequencies in the brain. By analysis of data recorded from rats during anaesthesia, we consider the stability and basins of attraction of fixed points in the phase portrait of the deterministic part of the retrieved stochastic process. We show that different classes of dynamics are associated with deep and light anaesthesia, and we demonstrate that the predominant directionality of the interaction is such that theta drives delta