Estimation of Inter-Channel Phase Synchronization of Eeg Signals in the Ridges of Their Wavelet Spectrograms in Patients With Traumatic Brain Injury

Abstract

Identical inter-channel phase coherency of electroencephalogram (EEG) signals is determined for healthy subjects during cognitive and motor tests. EEG signal phase is evaluated at the points of it wavelet-spectrogram ridge. Areas of interest of the cortex at cognitive and motor tests for group of healthy subjects are determined. Inter-channel EEG phase coherency for patients after a traumatic brain injury are represented.

Investigation of distribution laws of the phase difference of the envelopes of electromyograms of antagonist muscles in Parkinson's disease and essential tremor patients

“…So, in the works of Yu.V. Obukhov and coauthors [14,15], the so-called "ridges" of wavelet spectrograms are used. The use of ridges allows to select the leading frequency in the signal, as well as to find signal areas with a high signal-tonoise ratio.…”

“…A method for studying biomedical signals using the ridges of wavelet spectrograms was proposed in the works of Yu.V. Obukhov and co-authors [14,15]. The idea of the method is in that it is possible to distinguish the trajectory of the change in the leading signal frequency in time on the wavelet spectrogram.…”