Interlimb Responses to Perturbations of Bilateral Movements are Asymmetric.
Interlimb Responses to Perturbations of Bilateral Movements are Asymmetric.
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DOI：
10.1080/00222895.2020.1760196
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发表时间：
2021
影响因子：
1.4
通讯作者：
Sainburg RL
中科院分区：
文献类型：
--
作者：
Schaffer JE;Sainburg RL
以前的研究已经揭示了快速反馈介导的反应，在一个手臂的机械扰动施加到另一个手臂在共享双手任务。我们现在要问，这些肢体间的反应是否对称地表达。我们在虚拟现实环境中测试了这个问题：代表每只手的光标被用来“拿起”虚拟酒吧的每一端，并将其放入目标槽中。在偶然的、不可预测的试验开始时，一只手臂受到了干扰。无论哪个手臂被扰动，同侧的反应是显着的扰动期间。然而，在对侧的手臂的反应扰动是不对称的。虽然非优势臂表现出显着的运动学响应，以纠正酒吧的方向时，占主导地位的手臂机械扰动，占主导地位的手臂没有响应时，非优势臂受到干扰。我们还发现，在早期的肌电图活动中，只有非优势的前三角肌在对优势臂的扰动开始后100毫秒内表现出明显的反射反应，这种反应与纠正杆的位置一致，但与纠正杆的方向不一致。我们的结论是，在双边运动的扰动的反应表示不对称，这样的非优势臂的扰动的优势臂的反应是强于优势臂的非优势臂扰动的反应。
Previous research has revealed rapid feedback mediated responses in one arm to mechanical perturbations applied to the other arm during shared bimanual tasks. We now ask whether these interlimb responses are expressed symmetrically. We tested this question in a virtual reality environment: a cursor representing each hand was used to ‘pick up’ each end of a virtual bar and place it into a target trough. Near the onset of occasional, unpredictable trials, one arm was perturbed. Regardless of which arm was perturbed, ipsilateral responses were significant during the perturbation. However, responses in the arm contralateral to the perturbation were asymmetric. While the non-dominant arm showed a significant kinematic response to correct the bar orientation when the dominant arm was mechanically perturbed, the dominant arm did not respond when the non-dominant arm was perturbed. We also saw an asymmetric response in early EMG activity, in which only the non-dominant anterior deltoid showed a significant reflex response within 100 milliseconds of perturbation onset in response to dominant arm. This response was consistent with correcting the bar position, but not with correcting its orientation. We conclude that responses to perturbations during bilateral movements are expressed asymmetrically, such that non-dominant arm responses to perturbations to the dominant arm are stronger than dominant arm responses to non-dominant arm perturbations.
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