Journal
BIOLOGICAL CYBERNETICS
Volume 84, Issue 4, Pages 291-299Publisher
SPRINGER
DOI: 10.1007/s004220000212
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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 event-related potentials (ERPs). WS was computed for ERPs recorded from nine healthy subjects with three different types of stimuli, among them target stimuli in a cognitive task. A significant decrease of entropy was correlated with the responses to target stimuli (P300), thus showing that these responses correspond to a more ordered state than the spontaneous EEG. Furthermore, we propose the WS as a quantitative measure for such transitions between EEG (disordered state) and ERP (ordered state).
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