Adaptation to sequence force perturbation during vertical and horizontal reaching movement—averaging the past or predicting the future?
Adaptation to sequence force perturbation during vertical and horizontal reaching movement—averaging the past or predicting the future?
复制标题
适应垂直和水平到达运动期间的序列力扰动——平均过去还是预测未来？
DOI：
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发表时间：
2012
影响因子：
3
通讯作者：
A. Karniel
中科院分区：
文献类型：
--
作者：
F. Mawase;A. Karniel
过去十年中进行的几项研究表明，情景记忆比过去更能处理未来。在这里，我们考虑这个前提的背景下，运动记忆。在水平延伸范例中，用于对恒定和随机力场扰动的逐个试验运动适应的最先进的计算模型已经表明，运动记忆记录了过去经验的加权和，以预测随后试验中的力扰动。在目前的研究中，我们使用了标准的水平到达运动范式和一种新的垂直到达运动范式，以测试运动记忆功能在适应力场的幅度增加，在一个简单的可预测的线性序列。我们发现，适应恒定和序列力场是相似的垂直和水平的延伸。对于水平和垂直延伸，我们发现，在一个特定的试验中的期望值是前几次试验的平均值，而不是一个更大的扰动的期望值，从一个简单的外推预期。这些发现与我们之前关于举重和抓握任务的研究结果不一致，我们发现，在一系列逐渐增加重量的任务中，握力被正确地调整到下一个重量，从而预测未来，而不是平均过去。目前的研究结果致力于达到运动和我们以前的研究解决了提升任务表明，大脑可以产生至少两种不同类型的运动表征，无论是解决过去的达到或预测未来的提升。我们认为，先前的经验和环境的可变性的影响是观察到的差异，在解除和达到预期的原因。最后，我们讨论了这两种类型的记忆机制与不同的神经回路负责提升和达到。
Several studies conducted during the past decade have suggested that episodic memory is better equipped to handle the future than the past. Here, we consider this premise in the context of motor memory. State-of-the-art computational models for trial-by-trial motor adaptation to constant and stochastic force field perturbations in a horizontal reaching paradigm have shown that motor memory registers a weighted sum of past experiences to predict force perturbation in a subsequent trial. In the current study, we used the standard horizontal reaching movement paradigm and a novel vertical reaching movement paradigm to test motor memory function during adaptation to force fields increasing in magnitude in a simple predictable linear series. We found that adaptation to constant and sequence force fields are similar in vertical and horizontal reaching. For both horizontal and vertical reaching, we found that the expectation in a particular trial was the average of the previous few trials rather than an expectation of a larger perturbation, as would be expected from a simple extrapolation. These findings are not consistent with those of our previous studies on lifting and grasping tasks, in which we found that the grip force is correctly adjusted to the next weight in a series of tasks with gradually increasing weights, thus predicting the future rather than averaging the past. The results of the current study devoted to reaching movements and of our previous study addressing a lifting task suggest that the brain can generate at least two different types of motor representation, either addressing the past in reaching or predicting the future in lifting. We propose that prior experience and the effect of environment's variability are the reasons for the observed differences in expectation during lifting and reaching. Finally, we discuss these two types of memory mechanisms with respect to the distinct neural circuits responsible for lifting and reaching.
影响因子：
2.5
作者：
Scheidt, RA;Reinkensmeyer, DJ;Mussa-Ivaldi, FA
通讯作者：
Mussa-Ivaldi, FA
影响因子：
2.5
作者：
Scheidt, RA;Dingwell, JB;Mussa-Ivaldi, FA
通讯作者：
Mussa-Ivaldi, FA