Attentional modulation of perceptual grouping in human visual cortex: ERP studies
Han, SH; Jiang, Y; Mao, LH; Humphreys, GW; Qin, JG; S. H. Han
2005-11-01
发表期刊HUMAN BRAIN MAPPING
ISSN1065-9471
文章类型Article
卷号26期号:3页码:199-209
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
收录类别SCI ; SSCI
语种英语
WOS记录号WOS:000233056300005
引用统计
被引频次:29[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
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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.
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