PRE-STIMULUS SPECTRAL EEG PATTERNS AND THE VISUAL EVOKED-RESPONSE
PRE-STIMULUS SPECTRAL EEG PATTERNS AND THE VISUAL EVOKED-RESPONSE
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DOI：
10.1016/0168-5597(91)90037-x
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发表时间：
1991-01-01
期刊：
影响因子：
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通讯作者：
CARBONARI, JP
中科院分区：
文献类型：
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作者：
BRANDT, ME;JANSEN, BH;CARBONARI, JP
本文研究了7名男性受试者视觉诱发电位(VEP)N1和P2成分的潜伏期和波幅与刺激前大脑心理生理状态的关系。使用刺激前1秒脑电的增量、β、α和β频段的功率谱测量来评估大脑状态，并使用在2到6整秒之间随机发出的低强度闪光作为刺激。根据每个脑电频段内刺激前功率的相对大小对试验进行单独排序，并根据相同的刺激前频谱功率标准将其分组。计算这些组的平均诱发电位，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联系起来。7名受试者中有5名显示N1-P2波幅随着刺激前相对阿尔法功率的增加而持续增加。受试者之间的前刺激脑电对N1潜伏期的影响很小，但对P2潜伏期的影响中等(两者均显著)。N1和P2潜伏期对P2潜伏期均为中等(均显著)。N1潜伏期和P2潜伏期均随刺激前相对增量和θ功率的增加而缩短。
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 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.