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[Study of EEG approximate entrophy in different brain functional states]
1Department of Neurology, Union Hospital, Fujian Medical University, Fuzhou 350001.
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.