Parietal regions processing visual 3D shape extracted from disparity
Parietal regions processing visual 3D shape extracted from disparity
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DOI：
10.1016/j.neuroimage.2009.03.023
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发表时间：
2009-07-15
期刊：
影响因子：
5.7
通讯作者：
Orban, Guy A.
中科院分区：
文献类型：
--
作者：
Durand, Jean-Baptiste;Peeters, Ronald;Orban, Guy A.
三维（3D）形状对于抓握和操纵的视觉控制是重要的。我们使用功能磁共振成像来研究人类顶叶皮层对视差提取的三维形状的加工。受试者立体地观察描绘3D结构、多个深度平面中的2D结构或注视平面中的2D结构的随机线刺激。从第一条件中减去第二条件得到深度结构敏感区域，并从第二深度位置敏感区域中减去第三条件。两个前部顶内沟（IPS）区域，背侧IPS内侧（DIPSM）和背侧IPS前部（DIPSA）区域，对深度结构敏感，而不对深度位置敏感，而后部IPS区域，腹侧IPS（VIPS）区域，具有混合敏感性。所有三个IPS区域也对2D形状敏感，表明它们携带完整的3D形状信息。最后，DIPSM，而不是DIPSA是敏感的扫视相关的任务。这些结果强调了前IPS区域在3D形状处理中的重要性，与它们接近抓握相关区域一致。此外，与Durand，J.B.，Nelissen，K.，乔利角，瓦尔达克角，托德，J.T，诺曼，J. F，Janssen，R，Vandueler，W.，Orban，GA，2007.猴子顶叶皮质的前部区域视觉3D形状。在猴中获得的Neuron 55，493-505表明DIPSA和DIPSM可能分别代表AIP后部和LIP邻接部分的人类同源物。(C)2009 Elsevier Inc. All rights reserved.
Three-dimensional (3D) shape is important for the visual control of grasping and manipulation. We used fMRI to study the processing of 3D shape extracted from disparity in human parietal cortex. Subjects stereoscopically viewed random-line stimuli portraying a 3D structure, a 2D structure in multiple depth planes or a 2D structure in the fixation plane. Subtracting the second from the first condition yields depth-structure sensitive regions and subtracting the third from the second position-in-depth sensitive regions. Two anterior intraparietal sulcus (IPS) regions, the dorsal IPS medial (DIPSM) and the dorsal IPS anterior (DIPSA) regions, were sensitive to depth structure and not to position in depth, while a posterior IPS region, the ventral IPS (VIPS) region, had a mixed sensitivity. All three IPS regions were also sensitive to 2D shape, indicating that they carry full 3D shape information. Finally DIPSM, but not DIPSA was sensitive to a saccade-related task. These results underscore the importance of anterior IPS regions in the processing of 3D shape, in agreement with their proximity to grasping-related regions. Moreover, comparison with the results of Durand, J.B., Nelissen, K., Joly, C., Wardak, C., Todd, J.T, Norman, J.F., Janssen, R, Vanduffel, W., Orban, G.A., 2007. Anterior Regions of Monkey Parietal Cortex Process Visual 3D Shape. Neuron 55, 493-505 obtained in the monkey indicates that DIPSA and DIPSM may represent human homologues for the posterior part of AIP and the adjoining part of LIP respectively. (C) 2009 Elsevier Inc. All rights reserved.