A topographic study of ERPs elicited by visual feature discrimination
A topographic study of ERPs elicited by visual feature discrimination
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DOI：
10.1023/a:1022203811678
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发表时间：
1997-12-01
期刊：
影响因子：
2.7
通讯作者：
McCarley, RW
中科院分区：
文献类型：
--
作者：
O'Donnell, BF;Swearer, JM;McCarley, RW
研究了方向、空间频率、空间位置和颜色视觉识别诱发的事件相关电位（ERP）分量的功能特性和地形分布。从16名成人受试者的28个电极位置记录erp。测量5个ERP分量：N1（峰潜伏期160 ms）、P2（峰潜伏期250 ms）、前路N2（峰潜伏期260 ms）、后路N2（峰潜伏期280 ms）和P3（峰潜伏期400 ms）。当刺激为目标时，N1和P2的负向性更强，表现出选择负向效应。特征对分量振幅或地形的影响因分量而异。N1和P2对刺激方向和位置敏感。前路或后路N2对方位、空间频率和位置敏感。P3随方位变化而变化，但与其他刺激特征无关。颜色、方向和位置辨别任务的erp与垂直线段的跨任务比较表明，P2和N2对任务需求的变化敏感，而N1和P3对任务需求的变化不敏感。这些数据提供了地形证据，表明160-400 ms时间域的ERP成分可以根据特定的视觉特征加工而区分，并反映了人类皮层中不同的神经生理视觉通路。
The functional properties and topographic distribution of event-related potential (ERP) components elicited by visual discrimination of orientation, spatial frequency, spatial location, and color were investigated. ERPs were recorded from 28 electrode sites from 16 adult subjects. Five ERP components were measured: N1 (peak latency = 160 ms), P2 (250 ms), anterior N2 (260 ms), posterior N2 (280 ms), and P3 (400 ms). N1 and P2 were more negative when a stimulus was a target, showing the selection negativity effect. Feature-specific effects on component amplitude or topography varied by component. N1 and P2 were sensitive to stimulus orientation and location. Anterior or posterior N2 was sensitive to orientation, spatial frequency, and location. P3 varied with orientation, but not with other stimulus features. Cross-task comparisons of ERPs to vertical line segments in the color, orientation, and location discrimination tasks indicated that P2 and N2, but not N1 and P3, were sensitive to changes in task-demand. These data provide topographic evidence that ERP components in the 160-400 ms time domain can be differentiated on the basis to processing of specific visual features, and reflect neurophysiologically distinct visual pathways in the human cortex.