Josiassen R C, Shagass C, Roemer R A, Slepner S, Czartorysky B
Medical College of Pennsylvania, Philadelphia 19129.
Int J Psychophysiol. 1990 Sep;9(2):139-49. doi: 10.1016/0167-8760(90)90068-o.
Somatosensory event-related potentials (ERPs) were recorded during a selective attention task involving electrical stimuli delivered to index fingers or the left and right median nerves at the wrist. In 11 healthy, young subjects, ERPs were recorded from 6 scalp locations while they mentally counted the electrical stimuli designated as target. Sequential ERP events measured included N20 (negativity at 20 ms), P30, P45, N60, P100, N140, P180, and P400. Analysis of amplitude data indicated modifications of both early and late ERP events with selective attention. While electrical stimulation at the wrist yielded early ERP amplitudes that were larger overall and latencies that were generally shorter, the selection attention effects did not differ on the basis of site of stimulation. The early ERP selective attention effects had differing scalp topography, with the P30/P45 effect of maximal over postcentral gyrus and N60 effect maximal over prerolandic gyrus. The data further elucidate the temporal features and spatial distribution of somatosensory ERP processes involved in attentional activity.
在一项选择性注意任务中记录体感事件相关电位（ERP），该任务涉及向食指或手腕处的左右正中神经施加电刺激。在11名健康的年轻受试者中，当他们在心里数指定为目标的电刺激时，从6个头皮部位记录ERP。测量的连续ERP事件包括N20（20毫秒时的负波）、P30、P45、N60、P100、N140、P180和P400。对振幅数据的分析表明，早期和晚期ERP事件都会因选择性注意而发生改变。虽然手腕处的电刺激产生的早期ERP振幅总体上更大，潜伏期通常更短，但选择注意效应在刺激部位上并无差异。早期ERP选择性注意效应具有不同的头皮地形图，P30/P45效应在中央后回最大，N60效应在中央前回最大。这些数据进一步阐明了参与注意活动的体感ERP过程的时间特征和空间分布。
