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Neural substrates of global perception are modulated by local elem ent grouping 被引量:1
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作者 MAO Lihua ZHANG Xin +2 位作者 CHEN Jing GU Hua HAN Shihui 《Chinese Science Bulletin》 SCIE EI CAS 2006年第3期298-303,共6页
Prior behavioral studies suggested that global perception of compound stimuli is modulated by the way the local elements are grouped into global structures. The current work examined whether dis- tinct neural mechanis... Prior behavioral studies suggested that global perception of compound stimuli is modulated by the way the local elements are grouped into global structures. The current work examined whether dis- tinct neural mechanisms are involved in global/local processing of compound stimuli when local elements are grouped into global shapes by proximity or by shape similarity. Functional magnetic resonance im- aging (fMRI) was used to measure neural activities associated with global/local processing of compound shapes that were presented against either a black background (Experiment 1) or a background of crosses (Experiment 2) while subjects discriminated close or open shapes at the global or local level. Global processing induced activation in the medial occipital cortex in Experiment 1 but in the right inferior temporal, superior parietal, and inferior frontal cortex, and the left inferior parietal gyrus in Experiment 2. Local processing was associated with activations in the left precentral gyrus and right superior temporal gurys in Experiment 1 but in the left posterior inferior parietal gyrus in Experiment 2. The fMRI results suggest that global perception is mediated by distinct neural substrates depending upon how local ele- ments are grouped into global structures. 展开更多
关键词 核磁共振成像 神经系统 整体感知 局部元素组 全局处理 局部处理
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