Motor learning by field approximation
Motor learning by field approximation
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DOI：
10.1073/pnas.93.9.3843
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发表时间：
1996-04-30
影响因子：
11.1
通讯作者：
Bizzi, E
中科院分区：
文献类型：
--
作者：
Gandolfo, F;MussaIvaldi, FA;Bizzi, E
我们调查了人类受试者如何适应干扰他们手臂运动的力量。我们发现这种学习是基于中枢神经系统（CNS）的预测能力，从而消除外部施加的干扰力。我们的实验结果表明：(1)中枢神经系统对摄动力的补偿能力仅限于运动臂已经经历过摄动的空间位置。受试者还能够补偿邻近工作空间位置所经历的力。然而，随着距离运动肢体感知到干扰的位置的距离，适应性会平稳而迅速地衰减。（ii）我们的实验还表明，中枢神经系统在内在（肌肉和/或关节）坐标中建立了外部扰动力的内部模型。
We investigated how human subjects adapt to forces perturbing the motion of their arms. We found that this kind of learning is based on the capacity of the central nervous system (CNS) to predict and therefore to cancel externally applied perturbing forces. Our experimental results indicate: (i) that the ability of the CNS to compensate for the perturbing forces is restricted to those spatial locations where the perturbations have been experienced by the moving arm. The subjects also are able to compensate for forces experienced at neighboring workspace locations. However, adaptation decays smoothly and quickly with distance from the locations where disturbances had been sensed by the moving limb. (ii) Our experiments also show that the CNS builds an internal model of the external perturbing forces in intrinsic (muscles and/or joints) coordinates.