Separate representations of dynamics in rhythmic and discrete movements: evidence from motor learning
Separate representations of dynamics in rhythmic and discrete movements: evidence from motor learning
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DOI：
10.1152/jn.00780.2010
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发表时间：
2011-04-01
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.
霍华德IS，英格拉姆JN，沃伯特DM.有节奏和离散运动中动力学的独立表征：来自运动学习的证据。J Neurophysiol 105：1722-1731，2011.首次发表于2011年1月27日; doi：10.1152/jn.00780.2010.-在日常生活中，有节奏和离散的手臂运动无处不在，这两类运动是否源于相同或不同的潜在神经机制存在争议。在这里，我们研究干扰的运动学习范式，以测试是否有节奏和离散运动采用至少部分独立的神经表征。受试者被要求做右手的圆周运动，同时他们暴露在一个速度依赖的力场中，力场扰动运动路径的圆度，在每20圈的块结束时，力场扰动的方向反转。当受试者只做有节奏的或离散的圆周运动时，在两个相反的力场之间切换时会观察到干扰。然而，当受试者交替块之间的节奏和离散的运动，使每一个是唯一的扰动方向之一，干扰显着减少。只有在这种情况下，受试者才学会共同表征两种相反的扰动，这表明两种运动类型使用了不同的神经资源。我们的研究结果提供了进一步的证据表明，有节奏的和离散的运动至少部分采用独立的控制机制的运动系统。
Howard IS, Ingram JN, Wolpert DM. Separate representations of dynamics in rhythmic and discrete movements: evidence from motor learning. J Neurophysiol 105:1722-1731, 2011. First published January 27, 2011; doi:10.1152/jn.00780.2010.-Rhythmic and discrete arm movements occur ubiquitously in everyday life, and there is a debate as to whether these two classes of movements arise from the same or different underlying neural mechanisms. Here we examine interference in a motor-learning paradigm to test whether rhythmic and discrete movements employ at least partially separate neural representations. Subjects were required to make circular movements of their right hand while they were exposed to a velocity-dependent force field that perturbed the circularity of the movement path. The direction of the force-field perturbation reversed at the end of each block of 20 revolutions. When subjects made only rhythmic or only discrete circular movements, interference was observed when switching between the two opposing force fields. However, when subjects alternated between blocks of rhythmic and discrete movements, such that each was uniquely associated with one of the perturbation directions, interference was significantly reduced. Only in this case did subjects learn to corepresent the two opposing perturbations, suggesting that different neural resources were employed for the two movement types. Our results provide further evidence that rhythmic and discrete movements employ at least partially separate control mechanisms in the motor system.