Posture influences motor imagery: An fMRI study
Posture influences motor imagery: An fMRI study
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DOI：
10.1016/j.neuroimage.2006.07.017
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发表时间：
2006-11-01
期刊：
影响因子：
5.7
通讯作者：
Toni, Ivan
中科院分区：
文献类型：
--
作者：
de lange, Floris P.;Helmich, Rick C.;Toni, Ivan
运动想象被广泛用于研究神经控制动作的认知方面。然而，在运动想象过程中究竟模拟了什么仍然是一个有争议的问题。一方面，可以想象，运动想象是一种具身认知过程，涉及对自己身体运动的模拟。另一种可能性是，虽然运动想象依赖于运动过程的知识，但它并不需要受到自己身体物理结构影响的实际运动模拟。在此，我们区分这两个假设，在一个既定的运动想象任务的背景下：旋转的手画的偏侧判断，我们发现，反应时间的手偏侧判断遵循的生物力学约束的左手或右手的动作。最重要的是，受试者自己的左臂和右臂的位置会影响左右手的偏侧判断。在神经方面，手的偏侧判断激活了顶叶-额叶网络。这个网络内的活动随着想象中的手部动作的生物力学复杂性的增加而增加，即使刺激旋转的量是相同的。此外，在顶内沟的活动调制受试者自己的手的位置：一个更大的不一致的方向之间的受试者的手和刺激的手导致选择性增加intraparietal activity.Our的研究结果表明，运动想象产生的运动计划，取决于当前配置的四肢。这个运动计划是由一个顶叶-额叶网络计算的。在这个网络中，后顶叶皮层似乎将与身体当前位置相关的本体感受信息纳入运动计划。(c)2006年爱思唯尔公司All rights reserved.
Motor imagery is widely used to study cognitive aspects of the neural control of action. However, what is exactly simulated during motor imagery is still a matter of debate. On the one hand, it is conceivable that motor imagery is an embodied cognitive process, involving a simulation of movements of one's own body. The alternative possibility is that, although motor imagery relies on knowledge of the motor processes, it does not entail an actual motor simulation that is influenced by the physical configuration of one's own body. Here we discriminate between these two hypotheses, in the context of an established motor imagery task: laterality judgments of rotated hand drawings.We found that reaction times of hand laterality judgments followed the biomechanical constraints of left or right hand movements. Crucially, the position of subjects' own left and right arm influenced laterality judgments of left and right hands. In neural terms, hand laterality judgments activated a parieto-frontal network. The activity within this network increased with increasing biomechanical complexity of the imagined hand movements, even when the amount of stimulus rotation was identical. Moreover, activity in the intraparietal sulcus was modulated by subjects' own hand position: a larger incongruence in orientation between the subjects' hand and the stimulus hand led to a selective increase in intraparietal activity.Our results indicate that motor imagery generates motor plans that depend on the current configuration of the limbs. This motor plan is calculated by a parieto-frontal network. Within this network, the posterior parietal cortex appears to incorporate proprioceptive information related to the current position of the body into the motor plan. (c) 2006 Elsevier Inc. All rights reserved.