A NEW METHOD FOR QUANTIFYING EEG EVENT-RELATED DESYNCHRONIZATION - AMPLITUDE ENVELOPE ANALYSIS

Amplitude modulation (AM) analysis defines precisely the EEG signal en velope changes at sampling frequency. Here we demonstrate mathematical ly that event-related desynchronization (ERD) corresponds to the integ ration of AM-EEG. We applied this new approach to a group of 12 health y human volunteers hearing repeated auditory stimuli and statistically compared the results from ERD to those from AM-EEG. The results indic ate that AM-EEG characterized more precisely a specific evoked EEG cor tical activation event and may be a powerful method for studying the t ime-course of functional dynamic brain EEG mapping with improved time resolution.