[Study of EEG approximate entrophy in different brain functional states].
OBJECTIVE
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.
Department of Neurology, Union Hospital, Fujian Medical University, Fuzhou 350001.
H P
HP
Huang
Q T
QT
Chen
A
A
Zhen
D000328:Adult; D001921:Brain / Q000502:physiology*; D004569:Electroencephalography / Q000379:methods*; D019277:Entropy; D005260:Female; D006801:Humans; D008297:Male; D017711:Nonlinear Dynamics