对脑干听觉诱发电位相关维数的研究

A research on correlation dimension ofbrainstem auditory evoked potential

用二维延时重构技术重构了脑干听觉诱发电位（ＢＡＥＰ）时间序列，并用Ｇｒａｓｓｂｅｒｇｅｒ－ｐｒｏｃａｃｃｉａ算法计算了正常人与有听觉障碍病人的关联积分Ｃ（ｒ）．结果表明在局部线性区域，病人的关联维数Ｄ２较正常人偏高，两者的Ｄ２均不收敛．Ｍａｃｋｅｙ－Ｇｌａｓｓ方程的数值模拟表明噪声不是影响Ｄ２的根本原因．因此，ＢＡＥＰ信号不是一个稳定的混沌吸引子，Ｄ２不能作为临床识别的标准．

The time series of BAEP are reconstructed by the technique of two-dimension tine delay.Grass berger Procaccica algorithm is used to calculate the correlation integrals C(r) of a normal person and apatient who has auditory hindrance.The results indicate correlation dimension D2 for a patient is higherthan that of a normal person in local hear liegion and their D2 can't converge.The numberical simulation of Mackey-Glass equation shows noise is not the essential reason affecting D2.Therefore,BAEPsignals can't be a stable chaotic attractor and D2 can't be taken as a criterion of clinical recognition.