Dimitriou Pan, Buckingham Gavin
a Department of Psychology , Heriot-Watt University , Edinburgh , United Kingdom.
b Department of Sport and Health Sciences , University of Exeter , United Kingdom.
J Mot Behav. 2018 Jan-Feb;50(1):26-36. doi: 10.1080/00222895.2016.1271304. Epub 2017 Mar 2.
Bimanual coordination is a commonplace activity, but the consequences of using both hands simultaneously are not well understood. The authors examined fingertip forces across 4 experiments in which participants undertook a range of bimanual tasks. They first measured fingertip forces during simultaneous lifts of 2 identical objects, noting that individuals held the objects with more force bimanually than unimanually. They then varied the mass of the objects held by each hand, noting that when both hands lifted together performance was equivalent to unimanual lifts. The authors next measured one hand's static grip force while the other hand lifted an object. They found a gradual reduction of grip force throughout the trial, but once again no evidence of one hand influencing the other. In the final experiment the authors tested whether tapping with one hand could influence the static grip force of its counterpart. Although the authors found no changes in static grip force as a direct consequence of the other hand's actions, they found clear differences from one task to the other, suggesting an effect of task instruction. Overall, these results suggest that fingertip forces are largely independent between hands in a bimanual lifting context, but are sensitive to different task requirements.
双手协调是一项常见的活动，但对于同时使用双手的后果人们还了解得不够透彻。作者通过4个实验对指尖力进行了研究，在这些实验中参与者执行了一系列双手任务。他们首先测量了同时提起两个相同物体时的指尖力，注意到个体双手握持物体时比单手握持时用力更大。然后他们改变了每只手所握持物体的质量，注意到当双手一起提起物体时，表现与单手提起相当。作者接下来测量了一只手的静态握力，同时另一只手提起一个物体。他们发现在整个试验过程中握力逐渐减小，但同样没有证据表明一只手会影响另一只手。在最后一个实验中，作者测试了用一只手敲击是否会影响其对应手的静态握力。尽管作者没有发现另一只手的动作直接导致静态握力的变化，但他们发现不同任务之间存在明显差异，这表明任务指令有影响。总体而言，这些结果表明在双手提起物体的情境中，指尖力在很大程度上双手之间是独立的，但对不同的任务要求敏感。
