闪光视觉诱发电位单次提取的自参考自相关自适应干扰对消技术

On the Auto-Reference,Auto-Correlation and Adaptive Interference Cancellation Theories and Techniques for Single Extracting Flash Visual Evoked Potential

在分析传统的诱发电位提取的叠加平均理论缺陷的基础上,根据对自发脑电信号特性的认识和诱发电位提取的特定环境,提出了闪光视觉诱发电位(FVEP)单次提取的自参考自相关自适应干扰对消理论和技术(AAA-ICT)。该技术用求诱发脑电信号与参考信号的逐点滑动相关的方法,获得与诱发脑电信号有最大相关的参考信号段,用最小二乘原理(LSM)求取诱发脑电信号中有最大相关的参考信号段的对消因子W,然后进行干扰对消以获得单次提取的FVEP。用该技术能够有效地提取FVEP信号,并能获得单个受试者FVEP的变异性。

On the basis of analyzing the defects in traditional averaging theory for extracting evoked potential （EP）, and by realizing the characteristic of spontaneous eleetroencephalo-signal （S-EES） as well as the special environment for extracting EP, we propose an auto-reference, auto-correlation, adaptive interference cancellation （AAA- ICT） for use in the single trial of flash visual evoked potential （FVEP）. Firstly, the segment of reference signal, which has the best correlation with evoked electroencephalo-signal （E-EES）, was obtained using the method for calculating the sliding correlation point by point between E-EES and reference signal; then, the cancellation factor between E-EES and the most correlative reference signal segment was derived by the least square method; at last, the single trial of FVEP was acquired by interference cancellation. By this method, FVEP can be extracted perfectly and the FVEP variability of individual inter-stimulation can be obtained.