Attentional modulation of perceptual grouping in human visual cortex: Functional MRI studies

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	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
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
	2005-08-01
语种	英语
发表期刊	HUMAN BRAIN MAPPING
ISSN	1065-9471
卷号	25 期号:4 页码:424-432
期刊论文类型	Article
收录类别	SCI ; SSCI
WOS记录号	WOS:000230971000007
引用统计	被引频次：44[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
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: 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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