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视觉诱发电位(Visual Eyoked Poten-tail,VEP)是视脑皮质对外界视刺激信息所反应出的一簇电信号。从本世纪七十年代初引入临床以来,作为一种无损伤的客观检查方法,在网膜感觉层疾患,视路疾患及视功能评价上,有其独特的作用。一、脑电活动分类和诱发电位一般特性脑电可以分为二大类:自发电位和诱发电位。自发电位是脑内神经元在无特定刺激情况下所表现出的不停息的电活动。这种“自发”电位的幅值较高,从近毫伏级到几
Visual evoked potential (Visual Eyoked Poten-tail, VEP) is a cluster of electrical signals that the cortex responds to visual stimuli. Since its introduction into the clinic in the early 1970s, it has been used as a nondestructive objective test for its unique effects on retinal sensory layer disorders, visual pathological disorders, and visual function assessment. First, the classification of EEG activity and the general characteristics of evoked potential EEG can be divided into two categories: spontaneous potential and evoked potential. Spontaneous potential is the brain neurons in the absence of specific stimuli demonstrated by the non-stop electrical activity. The magnitude of this “spontaneous” potential is high, from near millivolt levels to a few