Attentional modulation of perceptual grouping in human visual cortex: Functional MRI studies
Han, SH; Jiang, Y; Mao, LH; Humphreys, GW; Gu, H; S. H. Han
2005-08-01
发表期刊HUMAN BRAIN MAPPING
ISSN1065-9471
文章类型Article
卷号25期号:4页码:424-432
摘要When presented with a complex visual scene, our visual system has to organize the discrete entities present into useful perceptual units. The current work investigated the neural substrates of perceptual grouping defined by Gestalt laws of proximity and similarity of shape, and whether the neural substrates underlying perceptual grouping are modulated by task relevance and spatial attention. In visual discrimination tasks, subjects identified the orientations of perceptual groups formed by proximity or sin-dlarity of local elements or alternatively identified colors of either dots around the grouped stimuli or the fixation cross. Using functional magnetic resonance imaging (fMRI), we identified that the calcarine cortex was involved in proximity grouping but not in the grouping process defined by similarity of shape. Moreover, we showed evidence that the neural correlates of proximity grouping in the calcarine cortex were weakened when the elements were of low task relevance and fell outside an attended area of field. The findings reveal the neural basis for basic grouping operations, as well as illustrating how attention and proximity grouping interact in human visual cortex.; When presented with a complex visual scene, our visual system has to organize the discrete entities present into useful perceptual units. The current work investigated the neural substrates of perceptual grouping defined by Gestalt laws of proximity and similarity of shape, and whether the neural substrates underlying perceptual grouping are modulated by task relevance and spatial attention. In visual discrimination tasks, subjects identified the orientations of perceptual groups formed by proximity or sin-dlarity of local elements or alternatively identified colors of either dots around the grouped stimuli or the fixation cross. Using functional magnetic resonance imaging (fMRI), we identified that the calcarine cortex was involved in proximity grouping but not in the grouping process defined by similarity of shape. Moreover, we showed evidence that the neural correlates of proximity grouping in the calcarine cortex were weakened when the elements were of low task relevance and fell outside an attended area of field. The findings reveal the neural basis for basic grouping operations, as well as illustrating how attention and proximity grouping interact in human visual cortex.
关键词attention fMRI 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:000230971000007
引用统计
被引频次:37[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/311026/5209
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
4.Beijing Chaoyang Hosp, Dept Radiol, Beijing, Peoples R China
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Han, SH,Jiang, Y,Mao, LH,et al. Attentional modulation of perceptual grouping in human visual cortex: Functional MRI studies[J]. HUMAN BRAIN MAPPING,2005,25(4):424-432.
APA Han, SH,Jiang, Y,Mao, LH,Humphreys, GW,Gu, H,&S. H. Han.(2005).Attentional modulation of perceptual grouping in human visual cortex: Functional MRI studies.HUMAN BRAIN MAPPING,25(4),424-432.
MLA Han, SH,et al."Attentional modulation of perceptual grouping in human visual cortex: Functional MRI studies".HUMAN BRAIN MAPPING 25.4(2005):424-432.
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