Division of Neuropsychology, Center of Neurology, Hertie-Institute for Clinical Brain Research, University of Tübingen, D-72076 Tübingen, Germany.
Division of Neuropsychology, Center of Neurology, Hertie-Institute for Clinical Brain Research, University of Tübingen, D-72076 Tübingen, Germany; Department of Psychology, University of South Carolina, Columbia, USA.
Neuroimage. 2021 Jul 1;234:117982. doi: 10.1016/j.neuroimage.2021.117982. Epub 2021 Mar 21.
Lesions to posterior temporo-parietal brain regions are associated with deficits in perception of global, hierarchical shapes, but also with impairments in the processing of objects presented under demanding viewing conditions. Evidence from neuroimaging studies and lesion patterns observed in patients with simultanagnosia and agnosia for object orientation suggest similar brain regions to be involved in perception of global shapes and processing of objects in atypical ('non-canonical') orientation. In a localizer experiment, we identified individual temporo-parietal brain areas involved in global shape perception and found significantly higher BOLD signals during the processing of non-canonical compared to canonical objects. In a multivariate approach, we demonstrated that posterior temporo-parietal brain areas show distinct voxel patterns for non-canonical and canonical objects and that voxel patterns of global shapes are more similar to those of objects in non-canonical compared to canonical viewing conditions. These results suggest that temporo-parietal brain areas are not only involved in global shape perception but might serve a more general mechanism of complex object perception. Our results challenge a strict attribution of object processing to the ventral visual stream by suggesting specific dorsal contributions in more demanding viewing conditions.
后部颞顶叶脑区损伤与整体形状知觉缺陷有关，但也与在苛刻的观看条件下处理物体的能力受损有关。来自神经影像学研究和同时失认症及物体朝向失认症患者的病变模式的证据表明，相似的脑区参与整体形状的知觉和非典型（“非规范”）方向物体的处理。在一个定位器实验中，我们确定了个体颞顶叶脑区在整体形状知觉中的作用，发现处理非规范物体时的大脑活动比处理规范物体时的大脑活动更强。在一个多元分析中，我们证明了后部颞顶叶脑区对非规范和规范物体的体素模式具有明显的区别，并且整体形状的体素模式与非规范观看条件下的物体模式更相似，而不是规范观看条件下的物体模式。这些结果表明，颞顶叶脑区不仅参与整体形状知觉，而且可能为更具挑战性的观看条件下的复杂物体知觉提供一种更普遍的机制。我们的结果通过暗示在更苛刻的观看条件下特定的背侧贡献，挑战了将物体处理严格归因于腹侧视觉流的观点。
