Shafritz Keith M, Gore John C, Marois Rene
Interdepartmental Neuroscience Program, Department of Diagnostic Radiology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06520, USA.
Proc Natl Acad Sci U S A. 2002 Aug 6;99(16):10917-22. doi: 10.1073/pnas.152694799. Epub 2002 Jul 29.
When multiple objects are simultaneously present in a scene, the visual system must properly integrate the features associated with each object. It has been proposed that this "binding problem" is solved by selective attention to the locations of the objects [Treisman, A.M. & Gelade, E. (1980) Cogn. Psychol. 12, 97-136]. If spatial attention plays a role in feature integration, it should do so primarily when object location can serve as a binding cue. Using functional MRI (fMRI), we show that regions of the parietal cortex involved in spatial attention are more engaged in feature conjunction tasks than in single feature tasks when multiple objects are shown simultaneously at different locations but not when they are shown sequentially at the same location. These findings suggest that the spatial attention network of the parietal cortex is involved in feature binding but only when spatial information is available to resolve ambiguities about the relationships between object features.
当多个物体同时出现在一个场景中时，视觉系统必须正确整合与每个物体相关的特征。有人提出，这种“绑定问题”是通过对物体位置的选择性注意来解决的[特雷斯曼，A.M. & 吉拉德，E.（1980年）《认知心理学》12卷，97 - 136页]。如果空间注意在特征整合中起作用，那么主要应该是在物体位置可以作为绑定线索时。使用功能磁共振成像（fMRI），我们发现，当多个物体同时在不同位置显示时，顶叶皮质中参与空间注意的区域在特征联结任务中比在单一特征任务中更活跃，但当它们在同一位置依次显示时则不然。这些发现表明，顶叶皮质的空间注意网络参与了特征绑定，但前提是空间信息可用于解决物体特征之间关系的模糊性。
