STUDY OF EEG APPROXIMATE ENTROPHY IN DIFFERENT BRAIN FUNCTIONAL STATES
Hua Huang · Chinese Journal of Applied Physiology · 2000
Aim: The approximate entrophy was applied to study EEG in different brain functional states. Methods: EEG were recorded in 40 cases healthy volunteers, who are in five functions states (1. resting conscious with eye close. 2. resting conscious with eye opened. 3. closed eyes and listening pure tone. 4.staring at picture. 5.closed eyes and counting numbers). ApEn were calculated in these EEG. Results: The ApEn of frontal was the highest and ApEn of occipital was the lowest in resting conscious with eye closed. ApEn in every brain area were higher than that in resting conscious with eye opened. ApEn were changed in different physiological functions. Variation of frontal EEG ApEn value were highest. Conclusions: The ApEn may reflect characteristic of EEG non linear dynamical. It is a stable parameter. The dates of its requirement were fewer. It may be a useful parameter in studying EEG time series.