Context-Dependent Partitioning of Motor Learning in Bimanual Movements
Context-Dependent Partitioning of Motor Learning in Bimanual Movements
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DOI：
10.1152/jn.00299.2010
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发表时间：
2010-10-01
影响因子：
2.5
通讯作者：
Wolpert, Daniel M.
中科院分区：
文献类型：
--
作者：
Howard, Ian S.;Ingram, James N.;Wolpert, Daniel M.
Howard IS, Ingram JN, Wolpert DM.双手运动中运动学习的情境依赖分割。中国生物医学工程学报（英文版），2009,31(4):559 - 561。首次发表于2010年8月4日；doi: 10.1152 / jn.00299.2010。人类受试者很容易适应单一的动态或视觉运动扰动。相反，当两个相反的动态或视觉运动扰动依次出现时，通常会观察到干扰。我们检查了双手运动背景对对立扰动之间干扰的影响，使用成对的背景，其中两个手臂之间的相对运动方向是不同的。当每个干扰方向与不同的双手环境相关联时，例如手臂在同一方向上的运动与相反方向的运动，干扰显著减少。这种情况发生在短时间的训练中，并且在动态和视觉运动扰动中都可以看到，这表明在不同的双手环境中运动学习的分裂。在一系列转移实验中发现了对这一观点的进一步支持。在一个双手环境中学习了单一的动态或视觉运动扰动，当环境改变时，即使扰动保持不变，受试者也表现出不完全的学习转移。此外，我们还研究了一个被动移动一只手臂的双手环境，并表明减少干扰需要主动运动。因此，运动的感官结果不足以让相反的扰动被共同表征。我们的研究结果表明，不同的双手运动环境至少部分地参与了运动系统中动力学和运动学的独立表征。
Howard IS, Ingram JN, Wolpert DM. Context-dependent partitioning of motor learning in bimanual movements. J Neurophysiol 104: 2082-2091, 2010. First published August 4, 2010; doi:10.1152/jn.00299.2010. Human subjects easily adapt to single dynamic or visuomotor perturbations. In contrast, when two opposing dynamic or visuomotor perturbations are presented sequentially, interference is often observed. We examined the effect of bimanual movement context on interference between opposing perturbations using pairs of contexts, in which the relative direction of movement between the two arms was different across the pair. When each perturbation direction was associated with a different bimanual context, such as movement of the arms in the same direction versus movement in the opposite direction, interference was dramatically reduced. This occurred over a short period of training and was seen for both dynamic and visuomotor perturbations, suggesting a partitioning of motor learning for the different bimanual contexts. Further support for this was found in a series of transfer experiments. Having learned a single dynamic or visuomotor perturbation in one bimanual context, subjects showed incomplete transfer of this learning when the context changed, even though the perturbation remained the same. In addition, we examined a bimanual context in which one arm was moved passively and show that the reduction in interference requires active movement. The sensory consequences of movement are thus insufficient to allow opposing perturbations to be co-represented. Our results suggest different bimanual movement contexts engage at least partially separate representations of dynamics and kinematics in the motor system.