Cortical systems mediating visual attention to both objects and spatial locations
Cortical systems mediating visual attention to both objects and spatial locations
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DOI：
10.1073/pnas.0601813103
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发表时间：
2006-07-25
影响因子：
11.1
通讯作者：
Behrmann, Marlene
中科院分区：
文献类型：
--
作者：
Shomstein, Sarah;Behrmann, Marlene
自然视觉场景由占据各种空间位置的许多对象组成。由于无法同时处理过多的信息，因此输入的多样性会争夺表示。使用事件相关功能磁共振成像，我们表明，注意力的机制，其中一个子集的输入被选择，是由后顶叶皮层（PPC）介导的。特别令人感兴趣的是，PPC活动是不同的敏感性的对象为基础的属性的输入，增强激活的那些位置绑定的一个出席的对象。同样令人感兴趣的是随后的早期皮层区域激活的调制，反映为对象内与对象间位置的血氧水平依赖性（BOLD）响应的时间曲线的差异。这些研究结果表明，基于对象的选择结果从对象敏感的重定向信号发出的PPC。PPC和早期感觉区域之间的动态回路使观察者能够优先注意复杂场景中感兴趣的对象。
Natural visual scenes consist of many objects occupying a variety of spatial locations. Given that the plethora of information cannot be processed simultaneously, the multiplicity of inputs compete for representation. Using event-related functional MRI, we show that attention, the mechanism by which a subset of the input is selected, is mediated by the posterior parietal cortex (PPC). Of particular interest is that PPC activity is differentially sensitive to the object-based properties of the input, with enhanced activation for those locations bound by an attended object. Of great interest too is the ensuing modulation of activation in early cortical regions, reflected as differences in the temporal profile of the blood oxygenation level-dependent (BOLD) response for within-object versus between-object locations. These findings indicate that object-based selection results from an object-sensitive reorienting signal issued by the PPC. The dynamic circuit between the PPC and earlier sensory regions then enables observers to attend preferentially to objects of interest in complex scenes.