Determining the degree of synchronism for intermittent phase synchronization in human electroencephalography data

• Published in: Technical physics letters Vol. 43; no. 5; pp. 499 - 502
• Main Authors: Koloskova, A. D., Moskalenko, O. I.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-05-2017; Springer Nature B.V
• Subjects: Brain; Classical and Continuum Physics; Discharge; Electroencephalography; Exponents; Human beings; Liapunov exponents; Phases; Physics; Physics and Astronomy; Synchronism; Time series
• ISSN: 1063-7850; 1090-6533
• DOI: 10.1134/S1063785017050200

The phenomenon of intermittent phase synchronization during development of epileptic activity in human beings has been discovered based on EEG data. The presence of synchronous behavior phases has been detected both during spike-wave discharges and in the regions of background activity of the brain. The degree of synchronism in the intermittent phase-synchronization regime in both cases has been determined, and it has been established that spike-wave discharges are characterized by a higher degree of synchronism than exists in the regions of background activity of the brain. To determine the degree of synchronism, a modified method of evaluating zero conditional Lyapunov exponents from time series is proposed.