Optimal task-dependent changes of bimanual feedback control and adaptation.

Optimal task-dependent changes of bimanual feedback control and adaptation.
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DOI:
10.1016/j.cub.2007.08.051
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发表时间:
2007-10-09
期刊:
影响因子:
9.2
通讯作者:
Diedrichsen, Jorn
Diedrichsen, Jorn
中科院分区:
生物学1区
文献类型:
--
作者:
Diedrichsen, Jorn

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双手运动的控制和适应通常被认为是一套固定的机制的功能。在这里,我证明了反馈控制和适应都随着任务目标而发生最优变化。参与者用两只手伸向两个不同的空间目标(双光标条件),或者用同样的双手移动出现在两只手的空间平均位置的光标到单个目标(单光标条件)。在其中一只手上随机施加了一个力场。在双光标条件下,在线修正只发生在受干扰的那只手上,而另一只手的运动是独立控制的。在单光标条件下,早在开始后190ms就可以检测到双手的在线校正。对于简单的任务相关成本函数,这些变化可以被证明是最优的。适应性,即扰动对下一个动作的影响,也取决于任务目标。在双光标条件下,只有受干扰的手适应了力的扰动,而在单光标条件下,两只手都适应了力的扰动。这些发现表明,中枢神经系统根据当前的任务要求,最优地改变了双手反馈控制和适应。
The control and adaptation of bimanual movements is often considered to be a function of a fixed set of mechanisms. Here, I show that both feedback control and adaptation change optimally with task goals. Participants reached with two hands to two separate spatial targets (two-cursor condition) or used the same bimanual movements to move a cursor presented at the spatial average location of the two hands to a single target (one-cursor condition). A force field was randomly applied to one of the hands. In the two-cursor condition, online corrections occurred only on the perturbed hand, whereas the other movement was controlled independently. In the one-cursor condition, online correction could be detected on both hands as early as 190 ms after the start. These changes can be shown to be optimal in respect to a simple task-dependent cost function. Adaptation, the influence of a perturbation onto the next movement, also depended on task goals. In the two-cursor condition, only the perturbed hand adapted to a force perturbation , whereas in the one-cursor condition, both hands adapted. These findings demonstrate that the central nervous system changes bimanual feedback control and adaptation optimally according to the current task requirements.
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