Department of Kinesiology, 266 Recreation Building, The Pennsylvania State University, University Park, PA 16802, USA.
Neurosci Lett. 2011 Feb 25;490(2):121-5. doi: 10.1016/j.neulet.2010.12.040. Epub 2010 Dec 23.
This study examined how different weighting coefficients imposed on individual finger force regulate bimanual finger force coordination patterns under the influence of bilateral coupling and visual information of the force output. The weighted sum of the two forces was computed as the total force output to match two target force levels (10% and 35% MVC) in separate conditions, and visual feedback of the total force output was provided in the experiment. The results revealed higher performance error at 35% in comparison with 10% MVC with the greatest error at the unequal coefficient setting. The correlation between the individual forces and the force output ratios correlated nonlinearly with the weighting coefficient ratios; however, the extent of change was much smaller than the coefficient ratios. The results suggest that bilateral coupling and task constraints interact to determine the coordination strategy. The irregularity of the individual finger forces increased with the weighting coefficient while the irregularity of the total force remained the same. The results support the hypothesis that the organization of redundant motor coordination patterns emerges from the interactive effect of the constraints on movement.
本研究考察了在双边耦合和力输出的视觉信息的影响下，对个体手指力施加不同权重系数如何调节双手手指力协调模式。将两个力的加权和作为总力输出，以匹配两个目标力水平（10%和 35%MVC）在不同条件下，并在实验中提供总力输出的视觉反馈。结果显示，与 10%MVC 相比，在 35%MVC 时性能误差更高，在不等系数设置时误差最大。个体力与力输出比之间的相关性与权重系数比呈非线性相关；然而，变化的程度比系数比小得多。结果表明，双边耦合和任务约束相互作用决定了协调策略。随着权重系数的增加，个体手指力的不规则性增加，而总力的不规则性保持不变。结果支持了冗余运动协调模式的组织源于运动约束的交互作用的假设。
