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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
2005-08-01
Source PublicationHUMAN BRAIN MAPPING
ISSN1065-9471
SubtypeArticle
Volume25Issue:4Pages:424-432
AbstractWhen 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.
Keywordattention fMRI perceptual grouping proximity calcarine cortex
Subject Area认知神经科学
Indexed BySCI ; SSCI
Language英语
WOS IDWOS:000230971000007
Citation statistics
Cited Times:38[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.psych.ac.cn/handle/311026/5209
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
4.Beijing Chaoyang Hosp, Dept Radiol, Beijing, Peoples R China
Recommended Citation
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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