Structural learning in feedforward and feedback control.
Structural learning in feedforward and feedback control.
复制标题
前馈和反馈控制中的结构学习。
DOI：
10.1152/jn.00315.2012
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发表时间：
2012
影响因子：
2.5
通讯作者：
Yousif N
中科院分区：
文献类型：
--
作者：
Yousif N
为了平稳有效地控制运动，大脑需要在运动过程中进行快速校正，以抵抗可能的干扰。它还需要调整随后的动作，以提高未来的表现。重要的是，反馈校正和前馈自适应都需要基于嘈杂且通常模糊的感觉数据进行。因此，电动机系统的初始响应，无论是在线校正还是自适应响应，都是由关于扰动的可能结构的先验假设指导的。在纠正和适应受力场扰动的运动的背景下，我们问这些先验是否是硬连线的，或者它们是否可以通过反复暴露于不同形状的力场来修改。我们发现，对意外扰动的反馈校正和对新力场的前馈适应都发生了变化，因此它们适合于抵消参与者以前经历过的力场类型。然后，我们研究了这些变化是由共同的机制还是由两个独立的机制驱动的。参与者经历的力场要么是时间上一致的，导致持续的适应，要么是时间上不一致的，导致很少的整体适应。我们发现，一致的力场修改反馈和前馈响应。相反，不一致的力场修改反馈校正的时间形状，但不是前馈自适应响应。这些结果表明，力扰动的响应可以修改的结构方式，这些修改至少部分是可分离的反馈和前馈控制。
For smooth and efficient motor control, the brain needs to make fast corrections during the movement to resist possible perturbations. It also needs to adapt subsequent movements to improve future performance. It is important that both feedback corrections and feedforward adaptation need to be made based on noisy and often ambiguous sensory data. Therefore, the initial response of the motor system, both for online corrections and adaptive responses, is guided by prior assumptions about the likely structure of perturbations. In the context of correcting and adapting movements perturbed by a force field, we asked whether these priors are hard wired or whether they can be modified through repeated exposure to differently shaped force fields. We found that both feedback corrections to unexpected perturbations and feedforward adaptation to a new force field changed, such that they were appropriate to counteract the type of force field that participants had experienced previously. We then investigated whether these changes were driven by a common mechanism or by two separate mechanisms. Participants experienced force fields that were either temporally consistent, causing sustained adaptation, or temporally inconsistent, causing little overall adaptation. We found that the consistent force fields modified both feedback and feedforward responses. In contrast, the inconsistent force field modified the temporal shape of feedback corrections but not of the feedforward adaptive response. These results indicate that responses to force perturbations can be modified in a structural manner and that these modifications are at least partly dissociable for feedback and feedforward control.
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影响因子：
2.6
作者：
Halford, GS;Bain, JD;Andrews, G
通讯作者：
Andrews, G
影响因子：
2.5
作者：
Scheidt, RA;Reinkensmeyer, DJ;Mussa-Ivaldi, FA
通讯作者：
Mussa-Ivaldi, FA
影响因子：
3.7
作者：
Braun DA;Waldert S;Aertsen A;Wolpert DM;Mehring C
通讯作者：
Mehring C
DOI：
10.1523/jneurosci.3075-08.2009
发表时间：
2009-05-20
期刊：
The Journal of neuroscience : the official journal of the Society for Neuroscience
影响因子：
--
作者：
Braun DA;Aertsen A;Wolpert DM;Mehring C
通讯作者：
Mehring C
影响因子：
2.5
作者：
Zarahn, Eric;Weston, Gregory D.;Krakauer, John W.
通讯作者：
Krakauer, John W.