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首页> 外文期刊>Journal of Neurophysiology >A limited set of muscle synergies for force control during a postural task.
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A limited set of muscle synergies for force control during a postural task.

机译：姿势任务期间用于控制力量的一组有限的肌肉协同作用。

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Recently developed computational techniques have been used to reduce muscle activation patterns of high complexity to a simple synergy organization and to bring new insights to the long-standing degrees of freedom problem in motor control. We used a nonnegative factorization approach to identify muscle synergies during postural responses in the cat and to examine the functional significance of such synergies for natural behaviors. We hypothesized that the simplification of neural control afforded by muscle synergies must be matched by a similar reduction in degrees of freedom at the biomechanical level. Electromyographic data were recorded from 8-15 hindlimb muscles of cats exposed to 16 directions of support surface translation. Results showed that as few as four synergies could account for >95% of the automatic postural response across all muscles and all directions. Each synergy was activated for a specific set of perturbation directions, and moreover, each was correlated with a unique vector of endpoint force under the limb. We suggest that, within the context of active balance control, postural synergies reflect a neural command signal that specifies endpoint force of a limb.
机译：最近开发的计算技术已被用于将高复杂度的肌肉激活模式减少为简单的协同组织，并为运动控制中长期存在的自由度问题带来新的见解。我们使用非负因子分解方法来识别猫的体位反应期间的肌肉协同作用，并检查这种协同作用对自然行为的功能意义。我们假设，由肌肉协同作用提供的神经控制的简化必须与生物力学水平上自由度的类似降低相匹配。从暴露于16个支撑表面平移方向的猫的8-15个后肢肌肉记录肌电数据。结果显示，只有四种协同作用可占所有肌肉和所有方向的自动姿势响应的95％以上。每个协同作用都针对一组特定的扰动方向被激活，此外，每个协同作用都与肢体下端点力的唯一向量相关。我们建议，在主动平衡控制的背景下，姿势协同作用反映了指定肢体端点力的神经命令信号。

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