Wavelet entropy in event related potentials: a new method show ordering of EEG-oscillations

R. QUIAN QUIROGA; O. A. ROSSO; E. BASAR; M. SCHURMANN

BIOLOGICAL CYBERNETICS.

Springer-Verlag

Año: 2001 vol. 84 p. 291 - 299

0340-1200

 In this work we show the application of a measure of entropy defined from the wavelet transform, namely the wavelet entropy (WS), to the study of the evenet-related potential (ERPs). WS was computed for ERPs recorded from nine healty subjects with three different types stimuli in a cognitive task. A significant decrease of entropy was correlated with the responses to target stimuli (P300), thus showing that this response correspond to the more "ordered" state than the spontaneous EEG. Furthermore, we propouse the WS as quantitative measure for such transitions between EEG ("disoredered state") and ERP ("ordered state").