A new measure of complexity of multichannel EEG recording is proposed. The quantity assesses the diversity of activities of different brain generators contributing to the global dynamics of electric field of brain.
New multichannel descriptors of EEG activity: complexity (Omega), total power (Sigma) and generalized frequency (Phi) were applied to whole night sleep analysis in 11 healthy subjects. The values of Omega and Phi decreased systematically from waking to slow wave sleep, and increased systematically in consecutive NREM-REM sleep cycles. The changes of Sigma were opposite to Omega and Phi. These descriptors may be an alternative approach to the EEG sleep analysis.
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