Brandt M E, Jansen B H, Carbonari J P
Department of Psychiatry and Behavioral Sciences, University of Texas Health Science Center, Houston.
Electroencephalogr Clin Neurophysiol. 1991 Jan-Feb;80(1):16-20. doi: 10.1016/0168-5597(91)90037-x.
The relationship between the latencies and amplitudes of the N1 and P2 components of the visual evoked potential (VEP) and the psychophysiological state of the brain immediately preceding the time of the stimulus has been investigated in 7 male subjects. Power spectral measures in the delta, theta, alpha and beta bands of the 1 sec pre-stimulus EEG were used to assess the brain state, and low intensity flashes, delivered randomly between 2 and 6 whole seconds, were used as the stimuli. Trials were ranked separately according to the relative amounts of pre-stimulus power in each EEG band and were partitioned into groups by an equal pre-stimulus spectral power criterion. Averaged EPs were computed from these groups and multiple regression analysis was used to relate pre-stimulus spectral power values to EP features. Five of the 7 subjects displayed consistent increases in N1-P2 amplitude as a function of increasing pre-stimulus relative alpha power. The between-subjects effect of pre-stimulus EEG on N1 latency was small, but was moderate for P2 latency (both significant). Both N1 and P2 latency were found to decrease with increasing amounts of pre-stimulus relative delta and theta power.
在7名男性受试者中，研究了视觉诱发电位（VEP）的N1和P2成分的潜伏期与波幅和刺激前即刻大脑的心理生理状态之间的关系。使用刺激前1秒脑电图在δ、θ、α和β波段的功率谱测量来评估大脑状态，并使用在2至6整秒之间随机发出的低强度闪光作为刺激。试验根据每个脑电图波段中刺激前功率的相对量分别进行排序，并根据刺激前频谱功率相等的标准分为几组。从这些组中计算平均诱发电位，并使用多元回归分析将刺激前频谱功率值与诱发电位特征相关联。7名受试者中有5名表现出N1 - P2波幅随着刺激前相对α功率的增加而持续增加。刺激前脑电图对N1潜伏期的受试者间效应较小，但对P2潜伏期的效应适中（均具有显著性）。发现N1和P2潜伏期均随着刺激前相对δ和θ功率的增加而缩短。
