van der Wel Robrecht P R D, Sternad Dagmar, Rosenbaum David A
Donders Institute for Brain, Cognition, and Behaviour, Radboud University Nijmegen, The Netherlands.
J Mot Behav. 2010 Jan-Feb;42(1):29-36. doi: 10.1080/00222890903267116.
Qualitative and quantitative changes characterize locomotion and rhythmic interlimb coordination at different speeds. Legs and hands do not move more or less quickly; they also adopt different relative coordination patterns. In the present article, the authors asked whether similar transitions occur for unimanual hand movements when speed is slowed below the preferred speed. Participants moved a handheld dowel back and forth between 2 large circular targets in time with a metronome at periods between 370 ms and 1667 ms. The authors analyzed the kinematics of participants' movements at each period and found that proportional dwell time and number of peaks in the velocity profile increased as driving periods increased. Path lengths and peak velocities remained relatively constant for driving periods exceeding 800 ms. Participants made only gradual changes to their movement parameters, so that they went from a continuous mode to a more discrete mode of behavior for longer driving periods. Thus, unlike for rhythmic bimanual movements or locomotory patterns, there are quantitative but no clear qualitative changes for unimanual movements. The results suggest that participants tried to move close to their preferred tempo at different rates, and that they avoided moving slowly.
定性和定量变化是不同速度下运动和有节奏的肢体间协调的特征。腿部和手部的运动并非只是或多或少地变快或变慢；它们还采用不同的相对协调模式。在本文中，作者探讨了在速度低于偏好速度时，单手手部运动是否会出现类似的转变。参与者随着节拍器，在370毫秒至1667毫秒的周期内，在两个大圆形目标之间来回移动手持木钉。作者分析了每个周期内参与者运动的运动学特征，发现随着驱动周期的增加，比例停留时间和速度曲线中的峰值数量增加。对于超过800毫秒的驱动周期，路径长度和峰值速度保持相对恒定。参与者只是逐渐改变他们的运动参数，以便在更长的驱动周期内从连续模式转变为更离散的行为模式。因此，与有节奏的双手运动或运动模式不同，单手运动存在定量变化，但没有明显的定性变化。结果表明，参与者试图以不同的速率接近他们偏好的节奏，并且他们避免缓慢移动。
