Fractionation of the visuomotor feedback response to directions of movement and perturbation.
Fractionation of the visuomotor feedback response to directions of movement and perturbation.
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DOI：
10.1152/jn.00377.2013
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发表时间：
2014-11-01
影响因子：
2.5
通讯作者：
Wolpert DM
中科院分区：
文献类型：
--
作者：
Franklin DW;Franklin S;Wolpert DM
最近的研究强调了反馈增益的调制和控制作为最优反馈控制的支持。虽然许多实验在不同的环境中对比反馈增益，但只有少数实验证明了从一个运动到下一个运动的反馈增益的适当调制。在这里，我们扩展以前的工作，检查是否可以学习不同的视觉反馈增益的不同方向的运动或扰动方向在同一姿势。为了做到这一点，我们测量视觉反应（无意识的运动反应的变化，在视觉反馈的手）在达到运动。以前的工作已经表明，这些反馈响应可以调制依赖于环境的统计分布。具体来说，反馈增益上调任务相关的环境和下调任务无关的环境。使用这两个统计分布，第一个实验检查这些反馈响应是否可以独立地调制为相同的肢体姿势的两个方向的运动（相同的肢体姿势，但无论是向内或向外运动），而第二次检查是否反馈响应可以调制，在一个单一的运动，扰动的左或右的范围。这两个实验都表明，视觉反馈反应可以独立学习，这样的反应是适合的环境。这项工作表明，反馈增益可以同时调整（上调和下调）取决于身体和环境的状态。结果表明，反馈反应可以细分，以适应世界的程度。
Recent studies have highlighted the modulation and control of feedback gains as support for optimal feedback control. While many experiments contrast feedback gains across different environments, only a few have demonstrated the appropriate modulation of feedback gains from one movement to the next. Here we extend previous work by examining whether different visuomotor feedback gains can be learned for different directions of movement or perturbation directions in the same posture. To do this we measure visuomotor responses (involuntary motor responses to shifts in the visual feedback of the hand) during reaching movements. Previous work has demonstrated that these feedback responses can be modulated depending on the statistical distributions of the environment. Specifically, feedback gains were upregulated for task-relevant environments and downregulated for task-irrelevant environments. Using these two statistical distributions, the first experiment examined whether these feedback responses could be independently modulated for the same limb posture for two directions of movement (same limb posture but on either an inward or outward movement), while the second examined whether the feedback responses could modulate, within a single movement, to perturbations to the left or right of the reach. Both experiments demonstrated that visuomotor feedback responses could be learned independently such that the response was appropriate for the environment. This work demonstrates that feedback gains can be simultaneously tuned (upregulated and downregulated) depending on the state of the body and the environment. The results indicate the degree to which feedback responses can be fractionated in order to adapt to the world.
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影响因子：
2.5
作者：
Franklin S;Wolpert DM;Franklin DW
通讯作者：
Franklin DW
影响因子：
5.5
作者：
Grey, MJ;Ladouceur, M;Sinkjær, T
通讯作者：
Sinkjær, T
影响因子：
2.5
作者：
Dimitriou, Michael;Franklin, David W.;Wolpert, Daniel M.
通讯作者：
Wolpert, Daniel M.
影响因子：
5.5
作者：
DOEMGES, F;RACK, PMH
通讯作者：
RACK, PMH
影响因子：
2.5
作者：
Franklin, DW;So, U;Milner, TE
通讯作者：
Milner, TE