Sorbonne Université, CNRS, Institut des Systèmes Intelligents et de Robotique, ISIR, Paris, France.
PLoS Comput Biol. 2022 Aug 30;18(8):e1010470. doi: 10.1371/journal.pcbi.1010470. eCollection 2022 Aug.
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.
当人类参与者反复遇到一个会扭曲他们运动轨迹的速度依赖力场时，他们会调整自己的运动行为以恢复直线轨迹。计算模型表明，适应力场是通过目标和动作之间的映射变化在动作选择层面发生的。这些模型的定量预测表明，适应前的早期受扰轨迹和适应后的晚期未受扰轨迹应该具有相反的曲率，即一个是另一个的镜像。我们在人类适应实验中检验了这些预测，结果发现，预期的镜像组织要么不存在，要么比模型预测的弱得多。这些结果与适应发生在动作选择层面的观点不一致，但与适应发生在目标选择层面的观点一致，就好像适应对应于朝着空间重新映射的目标瞄准。
