Kelso J A, Southard D L, Goodman D
J Exp Psychol Hum Percept Perform. 1979 May;5(2):229-38. doi: 10.1037//0096-1523.5.2.229.
In a set of three experiments, we show that after an auditory "go" signal, subjects simultaneously initiate and terminate two-handed movements to targets of widely disparate difficulty. This is the case when the movements required are (a) lateral and away from the midline of the body (Experiment 1), (b) toward the midline of the body (Experiment 2), and (c) in the forward direction away from the body midline (Experiment 3). Kinematic data obtained from high-speed cinematography (200 frames/sec) point to a tight coordinative coupling between the two hands. Although the hands move at entirely different speeds to different points in space, times to peak velocity and acceleration are almost perfectly synchronous. We believe that the brain produces simultaneity of action as the optimal solution for the two-handed task by organizing functional groupings of muscles (coordinative structures) that are constrained to act as a single unit.
在一组三项实验中，我们发现，在听到听觉“开始”信号后，受试者会同时启动并终止向难度差异很大的目标进行的双手动作。当所需动作是以下情况时都是如此：(a) 向身体外侧且远离身体中线（实验1），(b) 朝向身体中线（实验2），以及 (c) 向前远离身体中线（实验3）。从高速摄影（每秒200帧）获得的运动学数据表明，两只手之间存在紧密的协调耦合。尽管两只手以完全不同的速度移向空间中的不同点，但达到峰值速度和加速度的时间几乎完全同步。我们认为，大脑通过组织受约束作为一个单一单元起作用的肌肉功能组（协调结构），产生动作的同时性，将其作为双手任务的最佳解决方案。
