Attentional modulation of perceptual grouping in human visual cortex: ERP studies

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	Attentional modulation of perceptual grouping in human visual cortex: ERP studies
	Han, SH ; Jiang, Y; Mao, LH ; Humphreys, GW ; Qin, JG ; S. H. Han
摘要	We sought to identify the neural substrates underlying perceptual grouping, and examined whether the grouping-related neural activities are modulated by task relevance and attention by recording high-density event-related potentials (ERPs). Participants were presented with stimulus arrays, in which local elements were either evenly distributed or grouped into rows or columns by proximity or similarity, and had to discriminate orientations of the perceptual groups, or to identify the colors of dots around stimulus displays or of the fixation cross. We found that proximity grouping was indexed by a positive activity over the medial occipital cortex with a peak latency of about 100 ms after stimulus onset (Pd100), whereas grouping by similarity of shape was reflected in a negative activity with longer latency over the occipito-temporal areas. Dipole modeling based on a realistic boundary element head model localized the Pd100 to the right calcarine cortex. Moreover, we showed that the grouping-related activities were weakened when stimulus arrays were of low task relevance and fell outside an attended area of field. The results suggest that human calcarine cortex is engaged in early grouping operations defined by proximity, reinforcing the previous fMRI findings. Moreover, our ERP results indicate that the neural bases underlying perceptual grouping in human visual cortex can be modulated by task relevance and attention as early as 100 ms after sensory stimulation.; We sought to identify the neural substrates underlying perceptual grouping, and examined whether the grouping-related neural activities are modulated by task relevance and attention by recording high-density event-related potentials (ERPs). Participants were presented with stimulus arrays, in which local elements were either evenly distributed or grouped into rows or columns by proximity or similarity, and had to discriminate orientations of the perceptual groups, or to identify the colors of dots around stimulus displays or of the fixation cross. We found that proximity grouping was indexed by a positive activity over the medial occipital cortex with a peak latency of about 100 ms after stimulus onset (Pd100), whereas grouping by similarity of shape was reflected in a negative activity with longer latency over the occipito-temporal areas. Dipole modeling based on a realistic boundary element head model localized the Pd100 to the right calcarine cortex. Moreover, we showed that the grouping-related activities were weakened when stimulus arrays were of low task relevance and fell outside an attended area of field. The results suggest that human calcarine cortex is engaged in early grouping operations defined by proximity, reinforcing the previous fMRI findings. Moreover, our ERP results indicate that the neural bases underlying perceptual grouping in human visual cortex can be modulated by task relevance and attention as early as 100 ms after sensory stimulation.
关键词	attention ERPs perceptual grouping proximity calcarine cortex
学科领域	认知神经科学
	2005-11-01
语种	英语
发表期刊	HUMAN BRAIN MAPPING
ISSN	1065-9471
卷号	26 期号:3 页码:199-209
期刊论文类型	Article
收录类别	SCI ; SSCI
WOS记录号	WOS:000233056300005
引用统计	被引频次：39[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/311026/5207
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, Beijing 100871, Peoples R China 2.Chinese Acad Sci, Inst Psychol, Key Lab Mental Hlth, Beijing, Peoples R China 3.Univ Birmingham, Sch Psychol, Birmingham B15 2TT, W Midlands, England
推荐引用方式 GB/T 7714	Han, SH,Jiang, Y,Mao, LH,et al. Attentional modulation of perceptual grouping in human visual cortex: ERP studies[J]. HUMAN BRAIN MAPPING,2005,26(3):199-209.
APA	Han, SH,Jiang, Y,Mao, LH,Humphreys, GW,Qin, JG,&S. H. Han.(2005).Attentional modulation of perceptual grouping in human visual cortex: ERP studies.HUMAN BRAIN MAPPING,26(3),199-209.
MLA	Han, SH,et al."Attentional modulation of perceptual grouping in human visual cortex: ERP studies".HUMAN BRAIN MAPPING 26.3(2005):199-209.