神经系统的诱发反应常常被自发的神经活动所掩盖。过去用阴极射线示波器扫描重叠方法可以使诱发反应在杂乱的自发反应(干扰)的背景上显示出来

但这个方法不能减低干扰水平。在体感诱发电位记录方面

近代进展

产生了无损伤技术

用来测定神经系统从外周到皮层的各种电活动。该技术的创始人Dawson首先设计了从头皮电极引导诱发电位的自动累加平均方法。使诱发电位能从不规则出现的自发脑电波动中提取出来。而近代电子计算机技术的发展与应用

使累加诱发电位技术更趋完善。用累加技术所得的诱发反应比用多The summation technique appearing in 1950's has now been one of the important techniques for research on neurophysiology and pathology

and begun to be used in clinic. There are several kinds of average evoked pote- ntials. In the present paper emphasis is placed on somatosensory evoked potentials (SEP). The factors influencing SEP

the expression of SEP of the patients with lesion of neural system

the research advance of this te- chnique on finding a small brain lesion and the development of a method for objective pain measurement are briefly introduced in this paper. At last

the neurophysiologic mechanism of SEP is briefly introduced.