Persistence of motor adaptation during constrained, multi-joint, arm movements
Persistence of motor adaptation during constrained, multi-joint, arm movements
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DOI：
10.1152/jn.2000.84.2.853
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发表时间：
2000-08-01
影响因子：
2.5
通讯作者：
Mussa-Ivaldi, FA
中科院分区：
文献类型：
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作者：
Scheidt, RA;Reinkensmeyer, DJ;Mussa-Ivaldi, FA
我们研究了与适应一个新的动态环境中的目标为导向的运动的优势arm.11正常，人类受试者有针对性地达到在水平面上的运动，而持有的两个关节的机器人机械手的手柄的稳定性。该机器人被编程为产生一种新颖的粘性力场，该力场垂直于所需的运动方向扰动肢体。适应这个力场后，我们试图确定运动学误差和动力学标准的相对作用，促进恢复适应状态。特别是，我们比较了运动学和动力学性能的措施时，运动学误差被允许发生后，删除的粘性领域，或防止施加一个模拟的，机械的“通道”的运动。手的力量记录在手柄显示，当运动学错误被阻止发生的应用程序的通道，从适应到新的领域的恢复是慢得多的运动学后效时，允许发生。特别是，当运动学错误被阻止时，受试者坚持产生大的力量，这是不必要的，以产生一个准确的范围。随着时间的推移，这些力的大小缓慢下降，速度比允许受试者犯运动学错误时慢得多。这一发现提供了强有力的实验证据表明，运动和动力学标准影响运动适应，运动依赖性因素在恢复原始动力学后的快速丧失适应中起主导作用。
We studied the stability of changes in motor performance associated with adaptation to a novel dynamic environment during goal-directed movements of the dominant arm. Eleven normal, human subjects made targeted reaching movements in the horizontal plane while holding the handle of a two-joint robotic manipulator. This robot was programmed to generate a novel viscous force field that perturbed the limb perpendicular to the desired direction of movement. Following adaptation to this force field, we sought to determine the relative role of kinematic errors and dynamic criteria in promoting recovery from the adapted state. In particular, we compared kinematic and dynamic measures of performance when kinematic errors were allowed to occur after removal of the viscous fields, or prevented by imposing a simulated, mechanical "channel" on movements. Hand forces recorded at the handle revealed that when kinematic errors were prevented from occurring by the application of the channel, recovery from adaptation to the novel field was much slower compared with when kinematic aftereffects were allowed to take place. In particular, when kinematic errors were prevented, subjects persisted in generating large forces that were unnecessary to generate an accurate reach. The magnitude of these forces decreased slowly over time, at a much slower rate than when subjects were allowed to make kinematic errors. This finding provides strong experimental evidence that both kinematic and dynamic criteria influence motor adaptation, and that kinematic-dependent factors play a dominant role in the rapid loss of adaptation after restoring the original dynamics.