Control of finger force direction in the flexion-extension plane
Control of finger force direction in the flexion-extension plane
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DOI：
10.1007/s00221-004-2074-z
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发表时间：
2005-03-01
影响因子：
2
通讯作者：
Zatsiorsky, VM
中科院分区：
文献类型：
--
作者：
Gao, F;Latash, ML;Zatsiorsky, VM
我们已经研究了在任务中，需要生产的总力的一个子集的手指在一个特定的方向上的屈伸平面的手指之间的相互作用。9名受试者在规定的方向上产生指尖力，最大随意收缩（MVC）的努力，并保持峰值力两秒钟。测试了六个手指组合，四个单指任务-食指（I），中指（M），无名指（R）和小指（L）-一个两位数任务（IM）和一个四位数任务（IMRL）。受试者被要求在两个方向上产生手指力，0度（垂直于换能器表面）和15度朝向手掌。在所有的任务条件下，有两个实验会话，有和没有视觉反馈的任务向量。主要研究结果是：目标方向显著影响恒定误差（CE），但不影响可变误差（VE），而去除反馈导致VE增加。手指产生的力的方向，没有明确要求产生力（奴役手指）取决于目标方向。在多指任务中，个别手指产生的力的方向，可以显着不同的目标方向，而合力指向目标方向。
We have examined the interaction among individual finger forces in tasks that required the production of the total force by a subset of fingers in a particular direction in the flexion-extension plane. Nine subjects produced fingertip forces in a prescribed direction with a maximum voluntary contraction (MVC) effort and held the peak force for two seconds. Six finger combinations were tested, four single-finger tasks-Index (I), Middle (M), Ring (R) and Little (L)-one two-digit task (IM), and one four-digit task (IMRL). The subjects were asked to generate the finger forces in two directions, 0degrees (perpendicular to the surface of the transducer) and 15degrees toward the palm. In all task conditions, there were two experimental sessions, with and without visual feedback on the task force vector. The main findings were:The target direction significantly affected the constant error (CE) but not the variable error (VE) while removal of the feedback resulted in an increase in VE.The direction of the forces produced by fingers that were not explicitly required to produce force (enslaved fingers) depended on the target direction.In multi-finger tasks, the individual fingers produced force in directions that could differ significantly from the target direction, while the resultant force pointed in the target direction.