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首页> 外文期刊>Journal of Neurophysiology >Sensorimotor feedback based on task-relevant error robustly predicts temporal recruitment and multidirectional tuning of muscle synergies
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Sensorimotor feedback based on task-relevant error robustly predicts temporal recruitment and multidirectional tuning of muscle synergies

机译：基于与任务相关的错误的感觉运动反馈强有力地预测了肌肉协同作用的时间募集和多方向调整

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We hypothesized that motor outputs are hierarchically organized such that descending temporal commands based on desired task-level goals flexibly recruit muscle synergies that specify the spatial patterns of muscle coordination that allow the task to be achieved. According to this hypothesis, it should be possible to predict the patterns of muscle synergy recruitment based on task-level goals. We demonstrated that the temporal recruitment of muscle synergies during standing balance control was robustly predicted across multiple perturbation directions based on delayed sensorimotor feedback of center of mass (CoM) kinematics (displacement, velocity, and acceleration). The modulation of a muscle synergy's recruitment amplitude across perturbation directions was predicted by the projection of CoM kinematic variables along the preferred tuning direction(s), generating cosine tuning functions. Moreover, these findings were robust in biphasic perturbations that initially imposed a perturbation in the sagittal plane and then, before sagittal balance was recovered, perturbed the body in multiple directions. Therefore, biphasic perturbations caused the initial state of the CoM to differ from the desired state, and muscle synergy recruitment was predicted based on the error between the actual and desired upright state of the CoM. These results demonstrate that that temporal motor commands to muscle synergies reflect task-relevant error as opposed to sensory inflow. The proposed hierarchical framework may represent a common principle of motor control across motor tasks and levels of the nervous system, allowing motor intentions to be transformed into motor actions. ? 2013 the American Physiological Society.
机译：我们假设运动输出是按层次组织的，因此基于所需任务级别目标的降序时间命令可以灵活地募集肌肉协同作用，从而指定允许完成任务的肌肉协调的空间模式。根据此假设，应该有可能根据任务级别的目标预测肌肉协同增效的模式。我们证明，基于质心（CoM）运动学的延迟感觉运动反馈（位移，速度和加速度），可以在多个扰动方向上稳健地预测站立平衡控制过程中肌肉协同作用的暂时募集。通过沿首选调整方向对CoM运动变量进行投影，可以预测整个扰动方向上的肌肉协同增效幅度的调制，从而生成余弦调整函数。此外，这些发现在双相摄动方面是有力的，该摄动最初是在矢状面施加摄动，然后在矢状平衡恢复之前，在多个方向上扰动了身体。因此，双相扰动导致CoM的初始状态不同于所需状态，并且基于CoM的实际状态和所需垂直状态之间的误差来预测肌肉协同增效。这些结果表明，对肌肉协同作用的暂时运动命令反映了与任务相关的错误，而不是感觉上的流入。所提出的分层框架可以代表跨运动任务和神经系统水平的运动控制的通用原理，从而允许将运动意图转化为运动动作。 ？ 2013年美国生理学会。

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