IMPAIRMENT OF GRASPING MOVEMENTS FOLLOWING A BILATERAL POSTERIOR PARIETAL LESION
IMPAIRMENT OF GRASPING MOVEMENTS FOLLOWING A BILATERAL POSTERIOR PARIETAL LESION
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DOI：
10.1016/0028-3932(94)90084-1
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发表时间：
1994-04-01
期刊：
影响因子：
2.6
通讯作者：
MICHEL, F
中科院分区：
文献类型：
--
作者：
JEANNEROD, M;DECETY, J;MICHEL, F
我们报告了一例双侧后顶骨血管性病变的病例。A.T.在抓取简单物体（中性圆柱形销子）方面表现出双侧（右侧更明显）的缺陷，但在到达这些物体的位置方面没有缺陷。主要症状是手指的预期开口过大，与物体大小的相关性较差，导致抓握尴尬。无论受试者看到手还是看不见手，它都存在。如果用同样大小的普通物体代替中性物体，这种缺陷就不那么明显了。最后，在她必须用手指指出通过镜子呈现的虚拟图像的视觉物体的大小，或想象中的普通物体的大小的任务中，A.T.表现正常。这些结果在对象的对偶表示的框架内进行了讨论。由于后顶叶损伤，该患者只有“实用”的面向对象动作表征会受损。相比之下，对象识别的语义表示将是完整的。
The observation of a patient (A.T.) with a bilateral posterior parietal lesion of vascular origin is reported. A.T. presented a bilateral (more marked on the right) deficit in grasping simple objects (neutral cylindrical dowels) without deficit in reaching toward the location of these objects. The major symptom was an exaggerated anticipatory opening of the fingers with poor correlation with object size, resulting in awkward grasps. It was present both when the hand was Visible to the subject and when it was not. This deficit was much less marked if the neutral objects were replaced by usual objects of the same sizes. Finally, in tasks where she had to indicate with her fingers the size of visual objects presented as virtual images through a mirror, or the size of imagined usual objects, A.T. performed normally. These results are discussed within the framework of a dual representation of objects. Only the ''pragmatic'' representation for steering object-oriented actions would be impaired in this patient as a result of posterior parietal damage. By contrast the semantic representation for object identification would be intact.