Modulation of brain activities by hierarchical processing: A high-density ERP study
Modulation of brain activities by hierarchical processing: A high-density ERP study
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DOI：
10.1023/a:1022244727182
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发表时间：
1999-03-01
期刊：
影响因子：
2.7
通讯作者：
Zhou, Y
中科院分区：
文献类型：
--
作者：
Han, SH;Fan, SL;Zhou, Y
本研究通过记录由分层刺激诱发的高密度事件相关脑电位(ERPs)，研究了对分层模式的全局或局部水平的关注如何调制大脑活动。受试者在检测显示在左侧或右侧视野中的分层刺激的全局或局部水平上的目标时，从受试者那里获得120个通道的事件相关电位记录。我们发现，对局部刺激特征的注意增强了后部的P1和N2成分，其中N2的增强显示了左半球的优势，而与刺激位置无关。额叶P2的分布也有差异。当整体和局部刺激水平不相容时，反应时间减慢，并观察到对前部N2波幅和潜伏期的干扰效应。三维电流分布显示，在全球和局部条件下，后皮质的共同来源在80-230ms之间，对侧额叶的共同来源在300-400ms之间。然而，在230-350ms之间发现了一个额外的同侧额叶病灶，专门用于局部处理。这一结果证实了以前的事件相关电位研究的结果，并表明额叶对于全球结构的局部选择性加工特别重要。
The present study investigated how attention to global or local levels of hierarchical patterns modulates brain activities by recording high-density event-related brain potentials (ERPs) evoked by hierarchical stimuli. 120-channel recordings of ERPs were obtained from subjects while they detected targets at global or local levels of hierarchical stimuli displayed in the left or the right visual field. We found that attention to local stimulus features enhanced posterior P1 and N2 components, with the N2 enhancement showing a left hemisphere predominance regardless of stimulus positions. Difference was also seen in the distribution of the frontal P2. Reaction times were slowed when global and local levels of stimuli were incompatible, and an interference effect was observed on anterior N2 amplitudes and latencies. Three-dimensional current distributions showed common sources over the posterior cortex between 80-230 ms and a contralateral frontal source between 300-400 ms for global and local conditions. However, an additional ipsilateral frontal focus between 230-350 ms was found specially for local processing. The results corroborate the findings of previous ERP studies, and suggest that the frontal lobe is particularly important for the selective processing of local parts of a global structure.