摘要: Crowding, the identification difficulty for a target in the presence of nearby flankers, is ubiquitous in spatial vision and is considered a bottleneck of object recognition and visual awareness. Despite its significance, the neural mechanisms of crowding are still unclear. Here, we performed event-related potential and fMRI experiments to measure the cortical interaction between the target and flankers in human subjects. We found that the magnitude of the crowding effect was closely associated with an early suppressive cortical interaction. The cortical suppression was reflected in the earliest event-related potential component (C1), which originated in V1, and in the BOLD signal in V1, but not other higher cortical areas. Intriguingly, spatial attention played a critical role in the manifestation of the suppression. These findings provide direct and converging evidence that attention-dependent V1 suppression contributes to crowding at a very early stage of visual processing.
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期刊:
JOURNAL OF NEUROSCIENCE
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分类:
生物学
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生物物理学
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神经科学
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引用:
ChinaXiv:201605.01805
(或此版本
ChinaXiv:201605.01805V1)
DOI:10.12074/201605.01805V1
CSTR:32003.36.ChinaXiv.201605.01805.V1
- 推荐引用方式:
Chen, Juan,He, Yingchen,Zhu, Ziyun,Peng, Yujia,Zhang, Xilin,Fang, Fang,Chen, Juan,He, Yingchen,Zhu, Ziyun,Peng, Yujia,Zhang, Xilin,Fang, Fang,Fang, Fang,Fang, Fang,Zhou, Tiangang.(2016).Attention-Dependent Early Cortical Suppression Contributes to Crowding.中国生物工程预印本出版平台.[ChinaXiv:201605.01805]
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