Unit of Neurophysiology and Neuroengineering of HumanTechnology Interaction (NeXT), Università Campus Bio-Medico di Roma, Via Álvaro del Portillo 21, 00128, Rome, Italy.
Neurorobotics Lab, School of Engineering, Newcastle University, Newcastle Upon Tyne, NE1 7RU, UK.
Sci Rep. 2023 Apr 26;13(1):6789. doi: 10.1038/s41598-023-33531-2.
Pointing at a screen using wrist and forearm movements is a kinematically redundant task, and the Central Nervous System seems to manage this redundancy by using a simplifying strategy, named Donders' Law for the wrist. In this work we investigated (1) whether this simplifying approach is stable over time and (2) whether a visuomotor perturbation provided in the task space influences the strategy used to solve the redundancy problem. We conducted two experiments asking participants to perform the same pointing task in four different days (first experiment), and providing a visual perturbation, i.e. a visuomotor rotation to the controlled cursor (second experiment), while recording their wrist and forearm rotations. Results showed that the participant-specific wrist redundancy management (described by the Donders' surfaces) (1) neither changes over time (2) nor varies when a visuomotor perturbation is provided in the task space.
用腕部和前臂运动指向屏幕是一项运动学上冗余的任务，而中枢神经系统似乎通过使用一种简化策略来管理这种冗余，这种策略被称为腕部的 Donders 定律。在这项工作中，我们研究了（1）这种简化方法是否随时间稳定，以及（2）任务空间中提供的视觉运动干扰是否会影响解决冗余问题所使用的策略。我们进行了两项实验，要求参与者在四天内完成相同的指向任务（第一个实验），并在任务空间中提供视觉干扰，即对受控光标进行视觉运动旋转（第二个实验），同时记录他们的腕部和前臂旋转。结果表明，参与者特定的手腕冗余管理（由 Donders 曲面描述）（1）既不会随时间变化，（2）也不会在任务空间中提供视觉运动干扰时变化。
