Modulation of neural activities by enhanced local selection in the processing of compound stimuli
Han, SH; He, X; S. H. Han
2003-08-01
发表期刊HUMAN BRAIN MAPPING
ISSN1065-9471
文章类型Article
卷号19期号:4页码:273-281
摘要The global precedence effect refers to the findings that responses are faster to a global structure than to its local parts and local responses are slowed by incongruent global information. We recorded high-density event-related potentials (ERPs) to study the role of enhanced local selection in the global precedence effect. Hierarchical stimuli were compound letters in which the local letters were either identical (homogeneous stimuli) or the central local letter was brighter than (bright stimuli) or different in color from the others (red stimuli). Subjects were asked to attend to the pop-out local letter of the red and bright stimuli during the local task whereas there was no such instruction for the homogeneous stimuli. Top-down attention to the pop-out local item weakened the global reaction time advantage and the interference effect. The enhanced local selection decreased the amplitude of an occipito-temporal negativity between 240-360 msec but increased the amplitude of a frontal-central negativity between 260-320 msec related to local processing. The incongruency between global and local letters enlarged the posterior N2 in the local condition and this effect was eliminated by enhanced local selection. These effects were evident regardless of whether the pop-out local letter was defined by color or luminance difference. The results support the proposal that distinct neural mechanisms over the posterior and anterior areas are engaged in the selection process that contributes to local processing of compound stimuli.; The global precedence effect refers to the findings that responses are faster to a global structure than to its local parts and local responses are slowed by incongruent global information. We recorded high-density event-related potentials (ERPs) to study the role of enhanced local selection in the global precedence effect. Hierarchical stimuli were compound letters in which the local letters were either identical (homogeneous stimuli) or the central local letter was brighter than (bright stimuli) or different in color from the others (red stimuli). Subjects were asked to attend to the pop-out local letter of the red and bright stimuli during the local task whereas there was no such instruction for the homogeneous stimuli. Top-down attention to the pop-out local item weakened the global reaction time advantage and the interference effect. The enhanced local selection decreased the amplitude of an occipito-temporal negativity between 240-360 msec but increased the amplitude of a frontal-central negativity between 260-320 msec related to local processing. The incongruency between global and local letters enlarged the posterior N2 in the local condition and this effect was eliminated by enhanced local selection. These effects were evident regardless of whether the pop-out local letter was defined by color or luminance difference. The results support the proposal that distinct neural mechanisms over the posterior and anterior areas are engaged in the selection process that contributes to local processing of compound stimuli. (C) 2003 Wiley-Liss, Inc.
关键词event-related potential global precedence effect local selection occipito-temporal cortex
学科领域认知神经科学
收录类别SCI ; SSCI
语种英语
WOS记录号WOS:000184532600004
引用统计
被引频次:16[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.psych.ac.cn/handle/311026/5551
专题中国科学院心理研究所回溯数据库(1956-2010)
通讯作者S. H. Han
作者单位1.Peking Univ, Dept Psychol, Ctr Brain & Cognit Sci, Beijing 100871, Peoples R China
2.Chinese Acad Sci, Inst Psychol, Key Lab Mental Hlth, Beijing, Peoples R China
3.Univ Sci & Technol China, Key Lab Cognit Sci, Beijing, Peoples R China
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Han, SH,He, X,S. H. Han. Modulation of neural activities by enhanced local selection in the processing of compound stimuli[J]. HUMAN BRAIN MAPPING,2003,19(4):273-281.
APA Han, SH,He, X,&S. H. Han.(2003).Modulation of neural activities by enhanced local selection in the processing of compound stimuli.HUMAN BRAIN MAPPING,19(4),273-281.
MLA Han, SH,et al."Modulation of neural activities by enhanced local selection in the processing of compound stimuli".HUMAN BRAIN MAPPING 19.4(2003):273-281.
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