Rapid feedback corrections during a bimanual postural task
Rapid feedback corrections during a bimanual postural task
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DOI：
10.1152/jn.00669.2011
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发表时间：
2013-01-01
影响因子：
2.5
通讯作者：
Scott, Stephen H.
中科院分区：
文献类型：
--
作者：
Omrani, Mohsen;Diedrichsen, Joern;Scott, Stephen H.
张建军，张建军，张建军，等。手势动作的快速反馈修正。中国生物医学工程学报（英文版），2009；2012年10月10日首次发表；doi: 10.1152 / jn.00669.2011。运动生理学中的一个重要观察是，即使是最快的反馈反应也可以以任务依赖的方式进行修改。然而，一个肢体的这种反应是否可以根据其他肢体的在线感觉反馈进行调节，这仍然是未知的。我们通过一个双手姿势控制任务来测试这一点，在这个任务中，两只手要么控制两个单独的光标（双光标任务），要么控制一个显示在两只手之间空间平均值上的光标（单光标任务）。在第一个实验中，两只手对称地向外扰动。因此，在双光标任务中，参与者必须将手放回到目标上，而在单光标任务中，不需要纠正。在50 ms内，与双光标任务相比，单光标任务的肌电图活动显示出明显较小的反应。在第二个实验中，左手的扰动方向（向内/向外）是随机的，这样参与者就不能在扰动开始前预先计划他们的反应。结果表明，右臂在单光标任务中的行为依赖于来自左臂的在线反馈，肌肉反应在75 ms内根据左臂的方向特异性信息进行调节。这些结果表明，来自一个肢体的感觉反馈可以以任务依赖的方式快速修改另一个肢体的扰动反应。
Omrani M, Diedrichsen J, Scott SH. Rapid feedback corrections during a bimanual postural task. J Neurophysiol 109: 147-161, 2013. First published October 10, 2012; doi:10.1152/jn.00669.2011.-An important observation in motor physiology is that even the fastest feedback responses can be modified in a task-dependent manner. However, whether or not such responses in one limb can be modulated based on online sensory feedback from other limbs is still unknown. We tested this using a bimanual postural control task, in which the two hands either controlled two separate cursors (double-cursor task) or a single cursor displayed at the spatial average between the hands (single-cursor task). In the first experiment, the two hands were symmetrically perturbed outwards. In the double-cursor task, the participants therefore had to return their hands to the targets, whereas in the single-cursor task no correction was necessary. Within 50 ms, the electromyographic activity showed significantly smaller responses in the single-compared with the double-cursor task. In the second experiment, the perturbation direction of the left hand (inward/outward) was randomized, such that participants could not preplan their response before perturbation onset. Results show that the behavior of the right arm in the one-cursor task depended on online feedback coming from the left arm: the muscular response was modulated within 75 ms based on directionally specific information of the left arm. These results suggest that sensory feedback from one limb can quickly modify the perturbation response of another limb in a task-dependent manner.