论文标题
运动适应动态扰动的性质是什么？
What is the nature of motor adaptation to dynamic perturbations?
论文作者
论文摘要
当人类参与者反复遇到扭曲其运动轨迹的速度依赖性力场时，他们会适应其运动行为以恢复直线轨迹。计算模型表明，适应力场通过目标和动作之间的映射变化在行动选择水平上发生。这些模型的定量预测表明，适应前的早期扰动轨迹和适应后的晚期不受干扰的轨迹应具有相反的曲率，即一个是另一个镜像。我们在人类适应实验中测试了这些预测，我们发现预期的镜像组织要么不存在比模型所预测的要弱得多。这些结果与在动作选择水平上发生的适应性不兼容，但与在目标选择水平上发生的适应性兼容，好像适应性对应于针对空间重新映射的目标。
When human participants repeatedly encounter a velocity-dependent force field that distorts their movement trajectories, they adapt their motor behavior to recover straight trajectories. Computational models suggest that adaptation to a force field occurs at the action selection level through changes in the mapping between goals and actions. The quantitative prediction from these models indicates that early perturbed trajectories before adaptation and late unperturbed trajectories after adaptation should have opposite curvature, i.e. one being a mirror image of the other. We tested these predictions in a human adaptation experiment and we found that the expected mirror organization was either absent or much weaker than predicted by the models. These results are incompatible with adaptation occurring at the action selection level but compatible with adaptation occurring at the goal selection level, as if adaptation corresponds to aiming toward spatially remapped targets.
