Viewpoint-specific scene representations in human parahippocampal cortex
Viewpoint-specific scene representations in human parahippocampal cortex
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DOI：
10.1016/s0896-6273(03)00117-x
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发表时间：
2003-03-06
期刊：
影响因子：
16.2
通讯作者：
Downing, PE
中科院分区：
文献类型：
--
作者：
Epstein, R;Graham, KS;Downing, PE
在功能性磁共振成像（fMRI）中，“海马旁位置区”（PPA）对场景的反应比对面孔、物体或其他视觉刺激的反应更强烈。我们使用了事件相关的功能磁共振成像适应范式，以测试是否PPA代表场景的视点特定或视点不变的方式。PPA对保留固有场景几何形状的视点变化的响应与对完整场景变化的响应一样强烈，但对场景内的对象变化的响应不那么强烈。与此相反，枕叶外侧皮质的反应更强烈的对象的变化比空间的变化。这些结果表明，在PPA的场景处理是视点特定的，并建议PPA代表观察者和定义局部空间的表面之间的关系。
The "parahippocampal place area" (PPA) responds more strongly in functional magnetic resonance imaging (fMRI) to scenes than to faces, objects, or other visual stimuli. We used an event-related fMRI adaptation paradigm to test whether the PPA represents scenes in a viewpoint-specific or viewpoint-invariant manner. The PPA responded just as strongly to viewpoint changes that preserved intrinsic scene geometry as it did to complete scene changes, but less strongly to object changes within the scene. In contrast, lateral occipital cortex responded more strongly to object changes than to spatial changes. These results demonstrate that scene processing in the PPA is viewpoint specific and suggest that the PPA represents the relationship between the observer and the surfaces that define local space.