Interference between velocity-dependent and position-dependent force-fields indicates that tasks depending on different kinematic parameters compete for motor working memory
Interference between velocity-dependent and position-dependent force-fields indicates that tasks depending on different kinematic parameters compete for motor working memory
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DOI：
10.1007/s00221-005-2299-5
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发表时间：
2005-06-01
影响因子：
2
通讯作者：
Wolpert, DM
中科院分区：
文献类型：
--
作者：
Bays, PM;Flanagan, JR;Wolpert, DM
当人类接触到运动动力学的变化或视觉运动地图的变化时，就会表现出运动学习。然而，当连续学习两个相反的动态变换时，第一个的记忆被第二个的学习所覆盖；对于两个相反的视觉运动旋转也是如此。然而，这种逆行干扰并不适用于所有的变换组合。当在视觉运动旋转后学习动态变换时，干扰的存在或不存在似乎关键取决于动态任务的结构：依赖于手的位置的力场产生干扰，而施加在手的侧面的惯性载荷不产生干扰。为了解释这些结果，假设如果两个变换依赖于两个不同的运动运动学参数(如手的位置和速度)，则可以不受干扰地学习两个变换。在这里，我们证明了，与这个假设相反，依赖于手的位置的动态变换和取决于其速度的动态变换之间的干涉。然而，这种干扰被发现是不完整的，这支持了不同任务保持运动记忆的能力取决于它们在工作记忆中的表征冲突的程度的观点。
Humans demonstrate motor learning when exposed to changes in the dynamics of movement or changes in the visuomotor map. However, when two opposing dynamic transformations are learned in succession, the memory of the first is overwritten by learning of the second; the same is true for two opposing visuomotor rotations. This retrograde interference is not seen for all combinations of transformations, however. When a dynamic transformation is learned subsequent to a visuomotor rotation, the presence or absence of interference appears to depend crucially on the structure of the dynamic task: a force-field dependent on the position of the hand produces interference, whereas an inertial load applied lateral to the hand does not. To explain these results, it has been hypothesized that two transformations can be learned without interference if they depend on two different kinematic parameters of movement (such as position and velocity of the hand). Here we demonstrate, contrary to this hypothesis, interference between a dynamic transformation that depends on the position of the hand and one that depends on its velocity. However, the interference was found to be incomplete, supporting the view that the ability to retain motor memories for different tasks depends on the degree to which their representations conflict in working memory.