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Application of chaos analytic methods based on normal EEG

EEG (electroencephalogram) is usually used to analyze brain activity in clinical medicine; it can distinguish the abnormal circadian state from the normal circadian state. The paper presents some chaos time series analysis methods for analyzing the circadian state by the doctor/researcher. The validity of the methods is verified by some related graphs produced by computer simulation, and all these methods hold water in medical application and research.