FORCE CONTROL AND ITS RELATION TO TIMING
FORCE CONTROL AND ITS RELATION TO TIMING
复制标题
DOI：
10.1080/00222895.1987.10735402
复制
发表时间：
1987-03-01
影响因子：
1.4
通讯作者：
POKORNY, RA
中科院分区：
文献类型：
--
作者：
KEELE, SW;IVRY, RI;POKORNY, RA
先前的研究（Keele & Hawkins，1982; Keele，Pokorny，Corcos，& Ivry，1985）提出了两个一般的协调因素，区分人们在各种运动中，时间因素和连续运动的最大速率。这项研究为协调的第三个一般因素，即力量控制提供了可比较的证据。在用一个效应器（手指）再现目标力时表现出低变异性的受试者，倾向于用另外两个效应器（脚和前臂）表现出低变异性。此外，力量控制能力跨越不同的力量范围，跨越力量控制是主要目标或次要目标的情况。在一个周期性的轻敲任务中获得的力记录表明，虽然力控制在很大程度上是独立的时间，有一些两个因素之间的相互作用。力的变化似乎会使时间发生少量的扭曲，部分原因是更大的力会加速运动的实施，从而缩短前面的间隔并延长后面的间隔，部分原因是力的变化改变了中央计时机制。
Previous work (Keele & Hawkins, 1982; Keele, Pokorny, Corcos, & Ivry, 1985) has suggested two general factors of coordination that differentiate people across a variety of motor movements, factors of timing and maximum rate of successive movements. This study provides comparable evidence for a third general factor of coordination, that of force control. Subjects who exhibit low variability in reproducing a target force with one effector, the finger, tend to show low variability with two other effectors, the foot and forearm. In addition, ability in force control cuts across different force ranges and across situations where force control is either the primary goal or the secondary goal. Force records obtained during a periodic tapping task show that, although force control is largely independent of timing, there are some interactions between the two factors. Force variation appears to distort timing a small amount in part because larger forces speed up implementation of movement, thereby shortening preceding intervals and lengthening following ones, and in part because force variation alters central-timing mechanisms.