Meulenbroek R G, Rosenbaum D A, Thomassen A J, Schomaker L R
Nijmegen Institute for Cognition and Information, The Netherlands.
Q J Exp Psychol A. 1993 May;46(2):273-99. doi: 10.1080/14640749308401047.
How do we select combinations of limb segments to carry out physical tasks? Three possible determinants of limb-segment selection are hypothesized here: (1) optimal amplitudes and frequencies of motion for the effectors; (2) preferred movement axes for the effectors; and (3) a tendency to continue using already-recruited limb-segments. We tested these factors in a graphic production task. Seven subjects produced back-and-forth drawing movements of gradually changing amplitude. The largest amplitude to be covered, trial duration, movement axis, and direction of amplitude change (from small to large or vice versa) were varied between trials. Selspot recordings were used to study the relative contributions of the fingers, hand, and arm to displacements of the pen. The temporal order of limb-segment involvement was also studied. The results confirmed the predicted effects of the three limb-segment selection factors. We conclude that limb-segment coordination is adaptively related to biomechanical features of the motor system and to the computational demands of movement selection itself.
我们如何选择肢体节段的组合来执行身体任务？本文提出了三个可能决定肢体节段选择的因素：（1）效应器运动的最佳幅度和频率；（2）效应器偏好的运动轴；（3）持续使用已被激活的肢体节段的倾向。我们在一项图形绘制任务中对这些因素进行了测试。七名受试者进行了幅度逐渐变化的来回绘图运动。每次试验中，要覆盖的最大幅度、试验持续时间、运动轴以及幅度变化方向（从小变大或反之）均有所不同。使用Selspot记录来研究手指、手部和手臂对笔位移的相对贡献。同时还研究了肢体节段参与的时间顺序。结果证实了这三个肢体节段选择因素的预期效果。我们得出结论，肢体节段协调与运动系统的生物力学特征以及运动选择本身的计算需求具有适应性关联。
