Tillery S I, Ebner T J, Soechting J F
Graduate Program in Neuroscience, University of Minnesota, Minneapolis 55455, USA.
Exp Brain Res. 1995;104(1):1-11. doi: 10.1007/BF00229850.
We studied the relations between arm posture and hand location as monkeys performed tasks involving three-dimensional arm movements. Two specific questions were addressed: how reliable are these relations from trial to trial and from day to day, and are the arm postures dictated only by the location of the hand or are the postures also dependent on the task being performed? Based on the variable errors in linear regressions, we found that monkeys performed the tasks in a very stereotypic fashion from trial-to-trial: for a given monkey and task, knowing the position of the hand was sufficient to determine the posture of the arm. These relations did not change from day to day; the relation between hand location and posture was stable over the course of the experiments. In some of the tasks, the postures employed by the monkeys were strikingly similar to those observed in human psychophysical studies. The relations between hand location and arm posture exhibited a large degree of task dependence. Changing the required orientation of the hand resulted in changes in the arm posture.
我们研究了猴子在执行涉及三维手臂运动的任务时，手臂姿势与手部位置之间的关系。我们探讨了两个具体问题：这些关系在不同试验之间以及不同日期之间的可靠性如何，以及手臂姿势是否仅由手部位置决定，还是姿势也取决于所执行的任务？基于线性回归中的可变误差，我们发现猴子在每次试验中都以非常刻板的方式执行任务：对于给定的猴子和任务，知道手部位置就足以确定手臂的姿势。这些关系在不同日期之间没有变化；在整个实验过程中，手部位置与姿势之间的关系是稳定的。在一些任务中，猴子采用的姿势与在人类心理物理学研究中观察到的姿势惊人地相似。手部位置与手臂姿势之间的关系表现出很大程度的任务依赖性。改变手部所需的方向会导致手臂姿势的变化。
