对思维时的脑电信号混吨态进行了研究。在研究中首次引入了阵发性４０Ｈｚ脑电图检测技术借以确定用于混沌态分析的数据段，以确保分析结果的可靠性和稳定性。文中对混沌定量计算的参数也进行了一定研究，对３０多位受试者的脑电信号样本进行了分数维值和最大李亚谱诺夫指数计算。实验结果表明分数维值对临床应用确有价值，而仅凭一个最大的李亚谱诺夫指数似乎不能有助于诊断疾病。

In this paper.the chaotic theory is described briefly and the chaotic state ofEEG on thinking are studied. In this study. the method of detecting short bursts of 40 Hz EEG ac-tivity is firstly usedto dedermine the segments to be computed for analysis of the chaotic state ofEEG. therefore the reliability and stability of the analysis results are assured In this paper.thechaotic para meters of qa n titative analysis are studied and more then 30 subjects EEG are analysedfor the value of the fractional dimension and the maximal Lyapunov exponent.The results of exper-iments indicate that the value of the fractional dimension is valuable for clincal diagnosis and themaximal Lyapunov exponent is not sufficient for dignosis of disease.

R741.044 TN911.6