Modulation of neural activities by enhanced local selection in the processing of compound stimuli

PSYCH OpenIR > 中国科学院心理研究所回溯数据库(1956-2010)

	Modulation of neural activities by enhanced local selection in the processing of compound stimuli
	Han, SH ; He, X ; S. H. Han
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
	2003-08-01
语种	英语
发表期刊	HUMAN BRAIN MAPPING
ISSN	1065-9471
卷号	19 期号:4 页码:273-281
期刊论文类型	Article
收录类别	SCI ; SSCI
WOS记录号	WOS:000184532600004
引用统计	被引频次：18[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
推荐引用方式 GB/T 7714	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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