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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
2005-11-01
Source PublicationHUMAN BRAIN MAPPING
ISSN1065-9471
SubtypeArticle
Volume26Issue:3Pages:199-209
AbstractWe 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.
Keywordattention ERPs perceptual grouping proximity calcarine cortex
Subject Area认知神经科学
Indexed BySCI ; SSCI
Language英语
WOS IDWOS:000233056300005
Citation statistics
Document Type期刊论文
Identifierhttp://ir.psych.ac.cn/handle/311026/5207
Collection中国科学院心理研究所回溯数据库(1956-2010)
Corresponding AuthorS. H. Han
Affiliation1.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
Recommended Citation
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.
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