Short-term mobilization of processing resources is revealed in the event-related potential
Short-term mobilization of processing resources is revealed in the event-related potential
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DOI：
10.1111/1469-8986.00109
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发表时间：
2003-11-01
期刊：
影响因子：
3.7
通讯作者：
Kleinsorge, T
中科院分区：
文献类型：
--
作者：
Falkenstein, M;Hoormann, J;Kleinsorge, T
本研究调查是否偶尔努力改善性能，要求由precue，反映在事件相关电位（ERP）的变化。为了估计可能的努力引起的行为和ERP的变化的限制，我们操纵了precue和命令性刺激之间的时间（IS; precue间隔，PCI）。事实上，除了最短的PCI，受试者可以在努力试验中提高他们的表现。后线索ERP显示了一个额叶-中央的关联性负变（CNV），这是由一个额叶正/枕负波（P2/N2）。对于所有PCI，P2/N2和CNV都大于标准试验的努力。对于最短PCI（300 ms），在IS后观察到CNV增加。PCI 600和300的CNV增加开始于提示后约400 ms。结果表明，努力的性能改善与前增加额中央CNV和先前的P2/N2。CNV增加被认为反映了额叶执行过程的活动，通过该活动，可以在少于500 ms的时间内在试验到试验的基础上调动额外的处理资源。
This study investigates whether an occasional effortful improvement of performance, as asked for by a precue, is reflected in event-related potential (ERP) changes. To estimate the limits of possible effort-induced behavioral and ERP changes, we manipulated the time between precue and imperative stimulus (IS; precue interval, PCI). The subjects could, in fact, improve their performance in the effort trials, with all but the shortest PCI. The postcue ERP revealed a fronto-central contingent negative variation (CNV), which was preceded by a frontal positive/occipital negative wave (P2/N2). Both the P2/N2 and the CNV were larger for effort than for standard trials for all PCIs. For the shortest PCI (300 ms), the CNV increase was seen after the IS. The CNV increase for PCIs 600 and 300 began at about 400 ms postcue. The results suggest that effortful performance improvement is associated with prior increase of a frontocentral CNV and a preceding P2/N2. The CNV increase is thought to reflect the activity of a frontal executive process by which additional processing resources can be mobilized on a trial-to-trial basis within less than 500 ms.