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
中科院分区:
文献类型:
--
作者:
Diedrichsen, Jorn
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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