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Control of the dominant and nondominant hand: exploitation and taming of nonmuscular forces

机译：支配和支配手的控制：对非肌肉力量的利用和驯服

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摘要

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.
机译：据称，优势手和非优势手的运动在如何考虑部门间动态方面有所不同。与此主张一致，假设优势手的运动可以更好地利用固有肢体动力学，而无优势手的运动受到控制，以使固有动力学无效。对于快速的手指振动，此假设意味着非主导手的共收缩程度高于主导手。重复先前关于敲击手指的发现，优势手的手指振动比非优势手的手指振动更快且变化更少。更重要的是，在非优势手中，拮抗性肌肉的肌电信号之间的相对差异的方差较小，因此，相互的肌电活动的力量较小，表明共收缩水平比优势手高。另外，相对差信号的总功率的频谱分解表明，与非惯性手相比，惯性手的手指振动频带中的相对功率更大。这些发现与以下假设相一致：对于优势手，可以基于更精确的肢体动力学内部模型来进行更精确的前馈控制。

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  • 来源
    《Experimental Brain Research》 |2007年第3期|363-373|共11页
  • 作者

    Herbert Heuer;

  • 作者单位

    Institut für Arbeitsphysiologie an der Universität Dortmund Ardeystraße 67 44139 Dortmund Germany;

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