The N2pc component and stimulus duration
The N2pc component and stimulus duration
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DOI：
10.1097/wnr.0b013e3281e72d1b
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发表时间：
2007-07-16
期刊：
影响因子：
1.7
通讯作者：
Jolicoeur, Pierre
中科院分区：
文献类型：
--
作者：
Brisson, Benoit;Jolicoeur, Pierre
事件相关电位的N2pc组成部分是视觉空间注意部署的时刻指数。目前尚不清楚N2pc反映的是纯粹的自上而下的注意活动，还是自上而下的活动与自下而上的感觉活动的积极互动。在这里，我们提供了一个双侧视觉显示，包括一个目标和一个分心物，持续时间为50、200或350毫秒。N2pc在350毫秒的持续时间内比在两个较短的持续时间内要小。这些结果与N2pc反映自上而下和自下而上活动的长期积极相互作用的假设相悖，该假设预测随着刺激持续时间的增加，N2pc会增加。讨论了研究结果的理论和实际意义。
The N2pc component of the event-related potential is a moment-by-moment index of the deployment of visual-spatial attention. It is not clear whether the N2pc reflects pure top-down attentional activity or a positive interaction of top-down activity with bottom-up sensory activity. Here, we presented a bilateral visual display containing a target and a distractor for a duration of 50, 200, or 350 ms. The N2pc was smaller for the 350 ms duration than for the two shorter durations. These results go against the hypothesis that the N2pc reflects a long-lasting positive interaction of top-down and bottom-up activity, which would have predicted a larger N2pc as stimulus duration increased. Theoretical and practical implications of the results are discussed.