Carson R G, Thomas J, Summers J J, Walters M R, Semjen A
Department of Human Movement Studies, University of Queensland, Brisbane, Australia.
Q J Exp Psychol A. 1997 Aug;50(3):664-83. doi: 10.1080/713755721.
A bimanual circle drawing task was employed to elucidate the dynamics of intralimb and interlimb coordination. Right-handed subjects were required to produce circles with both hands in either a symmetrical (mirror) mode (i.e. one hand moving clockwise, the other counter-clockwise) or in an asymmetrical mode (i.e. both hands moving clockwise or counter-clockwise). The frequency of movement was scaled by an auditory metronome from 1.50 Hz to 3.25 Hz in 8 (8-sec) steps. In the asymmetrical mode, distortions of the movement trajectories, transient departures from the target pattern of coordination, and phase wandering were evidence as movement frequency was increased. These features suggested loss of stability. Deviations from circular trajectories were most prominent for movements of the left hand. Transient departures from the required mode of coordination were also largely precipitated by the left hand. The results are discussed with reference to manual asymmetries and mechanisms of interlimb and intersegmental coordination.
采用双手画圈任务来阐明肢体内部和肢体间协调的动态过程。要求右利手受试者用双手以对称（镜像）模式（即一只手顺时针移动，另一只手逆时针移动）或不对称模式（即双手都顺时针或逆时针移动）画圈。运动频率由听觉节拍器以8个（8秒）步长从1.50赫兹调整到3.25赫兹。在不对称模式下，随着运动频率增加，运动轨迹出现扭曲、暂时偏离目标协调模式以及相位漂移，这些特征表明稳定性丧失。左手运动时偏离圆形轨迹最为明显。左手也很大程度上导致了暂时偏离所需的协调模式。结合手动不对称以及肢体间和节段间协调机制对结果进行了讨论。
