Time frecuency analysis of electroencephalogram series

BLANCO, S; R. QUIAN QUIROGA; O. A. ROSSO; S. KOCHEN

Physical Review. E: Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics

American Physical Society

Año: 1995 vol. 51 p. 2624 - 2631

In this paper we propose a method, based on the Gabor transform, to quantify and visualize the time evolution  of the traditional frequency bands defined in the analysis of electroencephalogram (EEG) series. The information obtained in this way can be used for the information transfer analyses of the epileptic seizure as well as for their characterization. We found an optimal correlation between EEG visual inspection and the proposed method in the characterization of paroxism, spikes, and other transient aterations of the background activity. The dynamical changes during an epileptic seizure are shown through the phase portrait. The method proposed was examplifed with EEG series obtained with depth electrodes in refractory epileptic patients.