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

CORC > 心理研究所 > 中国科学院心理研究所 > 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
刊名	HUMAN BRAIN MAPPING
	2003-08-01
卷号	19 期号:4 页码:273-281
关键词	event-related potential global precedence effect local selection occipito-temporal cortex
ISSN号	1065-9471
文献子类	Article
英文摘要	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.
学科主题	认知神经科学
语种	英语
WOS记录号	WOS:000184532600004
公开日期	2011-08-22
内容类型	期刊论文
源URL	[http://ir.psych.ac.cn/handle/311026/5552]
专题	心理研究所_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.