Task-dependent coordination of rapid bimanual motor responses
Task-dependent coordination of rapid bimanual motor responses
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DOI：
10.1152/jn.00787.2011
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发表时间：
2012-02-01
影响因子：
2.5
通讯作者：
Wolpert, Daniel M.
中科院分区：
文献类型：
--
作者：
Dimitriou, Michael;Franklin, David W.;Wolpert, Daniel M.
Dimitriou M，富兰克林DW，Wolpert DM.快速双手动作反应的任务依赖性协调。J Neurophysiol 107：890-901，2012.首次发表于2011年11月9日; doi：10.1152/jn.00787.2011.-最优反馈控制假设反馈响应依赖于任何扰动的任务相关性。我们在双手任务中测试了这一预测，在概念上类似于平衡一个满载的托盘，其中每只手都可能被上下扰动。单肢机械扰动在对侧肢体产生适当方向和幅度的长潜伏期反射反应（“快速运动反应”），以保持托盘水平。在双手扰动，快速电机的反应调制适当的扰动影响托盘方向的程度。具体而言，尽管接收到相同的机械扰动引起肌肉拉伸，最强的反应时，对侧臂在相反的方向（大托盘倾斜），而不是在相同的方向或不扰动。从缩短伸肌的快速反应取决于从武器的感官信息的非线性总和，与响应双手同方向扰动（方向保持）小于组件unimanual扰动（任务相关）的总和。我们的结论是，任务依赖性调谐的反射可以调制在线在一个单一的审判的基础上，一个复杂的相互作用的武器。
Dimitriou M, Franklin DW, Wolpert DM. Task-dependent coordination of rapid bimanual motor responses. J Neurophysiol 107: 890-901, 2012. First published November 9, 2011; doi:10.1152/jn.00787.2011.-Optimal feedback control postulates that feedback responses depend on the task relevance of any perturbations. We test this prediction in a bimanual task, conceptually similar to balancing a laden tray, in which each hand could be perturbed up or down. Single-limb mechanical perturbations produced long-latency reflex responses ("rapid motor responses") in the contralateral limb of appropriate direction and magnitude to maintain the tray horizontal. During bimanual perturbations, rapid motor responses modulated appropriately depending on the extent to which perturbations affected tray orientation. Specifically, despite receiving the same mechanical perturbation causing muscle stretch, the strongest responses were produced when the contralateral arm was perturbed in the opposite direction (large tray tilt) rather than in the same direction or not perturbed at all. Rapid responses from shortening extensors depended on a nonlinear summation of the sensory information from the arms, with the response to a bimanual same-direction perturbation (orientation maintained) being less than the sum of the component unimanual perturbations (task relevant). We conclude that task-dependent tuning of reflexes can be modulated online within a single trial based on a complex interaction across the arms.