Attentional modulations of the early and later stages of the neural processing of visual completion.
Attentional modulations of the early and later stages of the neural processing of visual completion.
复制标题
视觉完成神经处理的早期和后期的注意调节。
DOI：
10.1038/srep08346
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发表时间：
2015-02-10
影响因子：
4.6
通讯作者：
Zhang D
中科院分区：
文献类型：
--
作者：
Wu X;Zhou L;Qian C;Gan L;Zhang D
大脑毫不费力地识别物体，即使属于物体的视觉信息被广泛分离，正如Kanizsa型错觉轮廓（IC）所证明的那样，尽管轮廓的片段被间隙分开，但轮廓仍被感知。这种大范围的视觉完成一直被认为是前注意，而它对自上而下的影响的依赖性仍然不清楚。在这里，我们报告单独的调制空间注意力和任务相关性的神经活动响应的IC。定位于外侧枕叶皮层的IC敏感事件相关电位在早期处理阶段（刺激开始后130-166 ms）受到空间注意的调制，并在后期处理阶段（234-290 ms）受到任务相关性的调制。 这些结果不仅证明了自上而下的注意对IC的神经加工的影响，而且阐明了IC加工不同阶段的注意调制特征。
The brain effortlessly recognizes objects even when the visual information belonging to an object is widely separated, as well demonstrated by the Kanizsa-type illusory contours (ICs), in which a contour is perceived despite the fragments of the contour being separated by gaps. Such large-range visual completion has long been thought to be preattentive, whereas its dependence on top-down influences remains unclear. Here, we report separate modulations by spatial attention and task relevance on the neural activities in response to the ICs. IC-sensitive event-related potentials that were localized to the lateral occipital cortex were modulated by spatial attention at an early processing stage (130–166 ms after stimulus onset) and modulated by task relevance at a later processing stage (234–290 ms). These results not only demonstrate top-down attentional influences on the neural processing of ICs but also elucidate the characteristics of the attentional modulations that occur in different phases of IC processing.
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