Neural control of motion-to-force transitions with the fingertip
Neural control of motion-to-force transitions with the fingertip
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DOI：
10.1523/jneurosci.4993-07.2008
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发表时间：
2008-02-06
影响因子：
5.3
通讯作者：
Valero-Cuevas, Francisco J.
中科院分区：
文献类型：
--
作者：
Venkadesan, Madhusudhan;Valero-Cuevas, Francisco J.
神经控制的任务，如快速获取精确捏仍然是未知的。因此，我们研究了神经控制的手指肌肉组织时，食指指尖突然从运动到静力生产过渡。九名受试者产生了一个向下敲击运动，然后垂直指尖力对刚性表面。我们同时记录了三维指尖力，加上完整的肌肉协调模式，使用肌内肌电图从所有七个食指肌肉。我们发现，肌肉协调模式明显地从运动模式切换到与接触前65 ms相似的等长力模式（p = 0.0004）。数学建模和分析表明，潜在的神经控制也以时间紧迫的方式在相互不兼容的策略之间切换。重要的是，这种潜在神经控制的突然切换污染了指尖力矢量方向，超出了肌肉激活-收缩动力学和神经肌肉噪声的解释（p
The neural control of tasks such as rapid acquisition of precision pinch remains unknown. Therefore, we investigated the neural control of finger musculature when the index fingertip abruptly transitions from motion to static force production. Nine subjects produced a downward tapping motion followed by vertical fingertip force against a rigid surface. We simultaneously recorded three-dimensional fingertip force, plus the complete muscle coordination pattern using intramuscular electromyograms from all seven index finger muscles. We found that the muscle coordination pattern clearly switched from that for motion to that for isometric force similar to 65 ms before contact (p = 0.0004). Mathematical modeling and analysis revealed that the underlying neural control also switched between mutually incompatible strategies in a time-critical manner. Importantly, this abrupt switch in underlying neural control polluted fingertip force vector direction beyond what is explained by muscle activation-contraction dynamics and neuromuscular noise (p