CAN WE MEASURE CONSCIOUSNESS WITH EEG COMPLEXITIES?

Author:

GU FANJI1,MENG XIN1,SHEN ENHUA1,CAI ZHIJIE2

Affiliation:

1. Liren Laboratory, Department of Physiology & Biophysics, School of Life Sciences, Brain Science Research Center, Fudan University, Shanghai 200433, P. R. China

2. Nonlinear Science Research Center, Fudan University, Shanghai 200433, P. R. China

Abstract

Several complexity measures, especially approximate entropy (ApEn) and a new defined complexity measure [Formula: see text], of EEG signals or the ones of the mutual information transmission between different channels of EEGs were calculated to distinguish different consciousness levels for different brain functional states. All of the measures decreased with the following order of brain states: rest with eyes open, eyes closed, light sleep and deep sleep. They decreased during epileptic seizures. On the contrary, the averaged mutual information between different channels increased significantly during the epileptic seizure; there is no significant difference among the averaged mutual information for the subject resting with eyes open, closed, being in light sleep and in deep sleep. Thus, the former indexes seem to be promising candidates to characterize different consciousness levels, while the latter seems not.

Publisher

World Scientific Pub Co Pte Lt

Subject

Applied Mathematics,Modelling and Simulation,Engineering (miscellaneous)

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