Control of the dominant and nondominant hand: exploitation and taming of nonmuscular forces
Control of the dominant and nondominant hand: exploitation and taming of nonmuscular forces
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DOI：
10.1007/s00221-006-0747-5
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发表时间：
2007-04-01
影响因子：
2
通讯作者：
Heuer, Herbert
中科院分区：
文献类型：
--
作者：
Heuer, Herbert
据称，优势手和非优势手的运动在如何考虑节间动力学方面有所不同。与这一主张相一致的是，假设优势手的运动可以更好地利用内在的肢体动力学，而控制非优势手的运动可以尽可能地使内在动力学无效。对于快速的手指振荡，这一假设意味着非优势手比优势手有更高水平的共同收缩。与之前的研究结果重复，优势手的手指振荡比非优势手更快，变化更少。更重要的是，在非优势手中，拮抗肌电信号之间的相对差异的方差和相互肌电活动的功率较小，这表明相对于优势手，共同收缩的水平相对较高。此外，对相对差信号的总功率进行频谱分解，发现优势手的手指振荡频带的相对功率比非优势手强。这些发现与假设一致，即基于更精确的肢体动力学内部模型，对优势手进行更精确的前馈控制是可能的。
Movements of the dominant and nondominant hand have been claimed to differ with respect to how they take intersegmental dynamics into account. Consistent with this claim, movements of the dominant hand are hypothesized to better exploit the intrinsic limb dynamics, whereas movements of the nondominant hand are controlled to make the intrinsic dynamics ineffective as far as this is possible. For rapid finger oscillations this hypothesis implies a higher level of co-contractions in the nondominant than in the dominant hand. Replicating previous findings on finger tapping, finger oscillations of the dominant hand were faster and less variable than those of the nondominant hand. More importantly, the variance of the relative difference between myoelectric signals of antagonistic muscles and thus the power of reciprocal myoelectric activity was smaller in the nondominant hand, indicating a relatively higher level of co-contractions than in the dominant hand. In addition, a spectral decomposition of the total power of the relative-difference signal revealed stronger relative power in the frequency band of the finger oscillations in the dominant than in the nondominant hand. These findings are consistent with the hypothesis that for the dominant hand more accurate feedforward control is possible based on a more accurate internal model of limb dynamics.