Quantification of alpha rhythm desynchronization using the acceleration spectrum entropy of the EEG.
Desynchronization of the alpha rhythm is usually quantified as a loss of power in the alpha band. In this study we describe an alternative approach where desynchronization is characterized as an increase in the irregularity of the EEG signal. A new measure, the acceleration spectrum entropy (ASE), is used to quantify EEG irregularity. The ASE is the normalized information entropy of the amplitude spectrum of the second derivative of a time series. The ASE is a measure of the randomness or irregularity of a time series and ranges from 0 (straight line) to 100 (discrete random signal). The ASE was calculated for short EEG epochs under eyes closed and eyes open conditions in 15 subjects. There was a significant increase in ASE in the eyes open condition, reflecting an increase in EEG complexity. The ASE is a sensitive measure of EEG desynchronization.
Stam
C J
CJ
Department of Neurology and Clinical Neurophysiology, Municipal Hospital of The Hague, The Netherlands.
Tavy
D L
DL
Keunen
R W
RW
D000513:Alpha Rhythm; D000704:Analysis of Variance; D001143:Arousal / Q000502:physiology; D002540:Cerebral Cortex / Q000502:physiology; D003344:Cortical Synchronization; D004569:Electroencephalography / Q000295:instrumentation*; D006801:Humans; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D012984:Software