Similar stretch reflexes and behavioral patterns are expressed by the dominant and nondominant arms during postural control
Similar stretch reflexes and behavioral patterns are expressed by the dominant and nondominant arms during postural control
复制标题
在姿势控制过程中，优势臂和非优势臂表现出类似的牵张反射和行为模式
DOI：
10.1152/jn.00152.2021
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发表时间：
2021
影响因子：
2.5
通讯作者：
Cluff, Tyler
中科院分区：
文献类型：
--
作者：
Maurus, Philipp;Kurtzer, Isaac;Antonawich, Ryan;Cluff, Tyler
肢体优势在许多日常活动中都很明显，这导致了一个突出的想法，即大脑的每个半球专门控制运动的不同方面。过去的研究表明，优势臂主要是通过肢体动力学的内部模型来控制的，该模型使神经系统能够产生有效的运动。相比之下，非优势臂可以主要通过阻抗机制来控制，该阻抗机制依赖于来自各个关节的感觉反馈的强调制来控制肢体姿势。我们测试了这种差异是否明显的行为反应和伸展反射后突然位移的手臂在posture control.Experiment 1应用特定的肘肩扭矩扰动组合（相同的所有参与者）。峰值关节位移，返回时间，终点的准确性，以及在几乎所有的肌肉拉伸反射的方向调谐和幅度之间的两个arms.Experiment 2induced特定组合的关节运动（相同的所有参与者）没有统计学差异。再次，峰值关节位移，返回时间，终点的准确性，以及在几乎所有的肌肉拉伸反射的方向调谐和幅度没有统计学差异时，对抗施加的负载与每个arm.Moderate强相关性之间的拉伸反射和行为反应的扰动与两个武器在两个实验。总的来说，结果不支持的想法，即优势臂专门利用内部模型和阻抗控制的非优势臂增加反射增益，以对抗突然施加在手臂上的负载在姿势控制。新&值得注意的是一个突出的假设是，神经系统控制优势臂通过预测内部模型和非优势臂通过阻抗机制。我们测试了双臂肌肉的拉伸反射是否也在姿势控制过程中显示出这种专业化。几乎所有的行为反应和牵张反射没有统计学差异，但武器之间的强烈相关。结果表明，反馈控制的个人签名是共同的两个手臂。
Limb dominance is evident in many daily activities, leading to the prominent idea that each hemisphere of the brain specializes in controlling different aspects of movement. Past studies suggest that the dominant arm is primarily controlled via an internal model of limb dynamics that enables the nervous system to produce efficient movements. In contrast, the nondominant arm may be primarily controlled via impedance mechanisms that rely on the strong modulation of sensory feedback from individual joints to control limb posture. We tested whether such differences are evident in behavioral responses and stretch reflexes following sudden displacement of the arm during posture control.Experiment 1applied specific combinations of elbow-shoulder torque perturbations (the same for all participants). Peak joint displacements, return times, end point accuracy, and the directional tuning and amplitude of stretch reflexes in nearly all muscles were not statistically different between the two arms.Experiment 2induced specific combinations of joint motion (the same for all participants). Again, peak joint displacements, return times, end point accuracy, and the directional tuning and amplitude of stretch reflexes in nearly all muscles did not differ statistically when countering the imposed loads with each arm. Moderate to strong correlations were found between stretch reflexes and behavioral responses to the perturbations with the two arms across both experiments. Collectively, the results do not support the idea that the dominant arm specializes in exploiting internal models and the nondominant arm in impedance control by increasing reflex gains to counter sudden loads imposed on the arms during posture control.NEW & NOTEWORTHYA prominent hypothesis is that the nervous system controls the dominant arm through predictive internal models and the nondominant arm through impedance mechanisms. We tested whether stretch reflexes of muscles in the two arms also display such specialization during posture control. Nearly all behavioral responses and stretch reflexes did not differ statistically but were strongly correlated between the arms. The results indicate individual signatures of feedback control that are common for the two arms.