The role of the dorsal stream for gesture production
The role of the dorsal stream for gesture production
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DOI：
10.1016/j.neuroimage.2005.07.026
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发表时间：
2006-01-15
期刊：
影响因子：
5.7
通讯作者：
Hallett, M
中科院分区：
文献类型：
--
作者：
Fridman, EA;Immisch, I;Hallett, M
熟练的手势需要完整的神经网络参与运动程序的存储，检索和执行。运动前皮质和/或顶叶皮质病变经常产生赤字的表现，手势，传递比不传递。背侧流将物体信息与物体动作联系起来，这表明工具使用的机械知识集中存储在大脑中。使用事件相关的功能磁共振成像，我们探讨了活动在延迟传递和不传递的手势。计划准备和执行的手势之间的比较表明，在腹侧前运动皮层（PMV）和低于上级梯度激活后顶叶皮层（PPc）的颞侧喙尾侧梯度的激活。传递性和不传递性手势之间的比较建立了一个功能特异性内的背流机械知识。结果表明，不仅PPc，而且PMv的动作过程中的感觉运动信息的加工。这可能是基底的选择性缺陷的识别性失用症患者。爱思唯尔公司出版
Skilled gestures require the integrity of the neural networks involved in storage, retrieval, and execution of motor programs. Premotor cortex and/or parietal cortex lesions frequently produce deficits during performance of gestures, transitive more than intransitive. The dorsal stream links object information with object action, suggesting that mechanical knowledge of tool use is stored focally in the brain. Using event-related fMRI, we explored activity during instructed-delay transitive and intransitive hand gestures. The comparison between planning-preparation and execution of gestures demonstrated a temporal rostral to caudal gradient of activation in the ventral premotor cortex (PMv) and inferior to superior gradient of activation in the posterior parietal cortex (PPc). Comparison between transitive and intransitive gestures established a functional specificity within the dorsal stream for mechanical knowledge. Results demonstrate that not only PPc but also the PMv acts in the processing of sensorimotor information during gestures. This might be the substrate underlying selective deficits in ideomotor apraxia patients. Published by Elsevier Inc.