Analysis of time-variant quadratic phase couplings in the tracé alternant EEG by recursive estimation of 3rd-order time-frequency distributions.
The quantification of transient quadratic phase couplings (QPC) by means of time-variant bispectral analysis is a useful approach to explain several interrelations between signal components. A generalized recursive estimation approach for 3rd-order time-frequency distributions (3rd-order TFD) is introduced. Based on 3rd-order TFD, time-variant estimations of biamplitude (BA), bicoherence (BC) and phase bicoherence (PBC) can be derived. Different smoothing windows and local moment functions for an optimization of the estimation properties are investigated and compared. The methods are applied to signal simulations and EEG signals, and it can be shown that the new time-variant bispectral analysis results in a reliable quantification of QPC in the tracé alternant EEG of healthy neonates.
Helbig
Marko
M
Institute of Biomedical Engineering and Informatics, Ilmenau Technical University, PF 100 565, 98684 Ilmenau, Germany. Marko.Helbig@tu-ilmenau.de
Schwab
Karin
K
Leistritz
Lutz
L
Eiselt
Michael
M
Witte
Herbert
H
D000465:Algorithms; D001921:Brain / Q000502:physiology*; D001931:Brain Mapping; D004569:Electroencephalography; D006801:Humans; D007231:Infant, Newborn; D017711:Nonlinear Dynamics; D012815:Signal Processing, Computer-Assisted; D013057:Spectrum Analysis; D013997:Time Factors