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Motor Imagery of Hand Actions: Decoding the Content of Motor Imagery From Brain Activity in Frontal and Parietal Motor Areas

机译:动作的运动意象:从额叶和顶叶运动区的大脑活动中解码运动意象的内容

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How motor maps are organized while imagining actions is an intensely debated issue. It is particularly unclear whether motor imagery relies on action-specific representations in premotor and posterior parietal cortices. This study tackled this issue by attempting to decode the content of motor imagery from spatial patterns of Blood Oxygen Level Dependent (BOLD) signals recorded in the frontoparietal motor imagery network. During fMRI-scanning, 20 right-handed volunteers worked on three experimental conditions and one baseline condition. In the experimental conditions, they had to imagine three different types of right-hand actions: an aiming movement, an extension-flexion movement, and a squeezing movement. The identity of imagined actions was decoded from the spatial patterns of BOLD signals they evoked in premotor and posterior parietal cortices using multivoxel pattern analysis. Results showed that the content of motor imagery (i.e., the action type) could be decoded significantly above chance level from the spatial patterns of BOLD signals in both frontal (PMC, M1) and parietal areas (SPL, IPL, IPS). An exploratory searchlight analysis revealed significant clusters motor-and motor-associated cortices, as well as in visual cortices. Hence, the data provide evidence that patterns of activity within premotor and posterior parietal cortex vary systematically with the specific type of hand action being imagined. (C) 2015 The Authors. Human Brain Mapping Published by Wiley Periodicals, Inc.
机译:在想象动作的同时如何组织运动图是一个激烈争论的问题。尚不清楚运动图像是否依赖于运动前和后顶叶皮层中特定于动作的表示。本研究通过尝试从额顶运动图像网络中记录的血氧水平依赖性(BOLD)信号的空间模式中解码运动图像的内容来解决此问题。在功能磁共振成像扫描期间,有20位右撇子志愿者在三种实验条件和一种基线条件下工作。在实验条件下,他们必须想象三种不同类型的右手动作:瞄准运动,伸展屈曲运动和挤压运动。想象的动作的身份是通过多体素模式分析从运动前和后顶叶皮质诱发的BOLD信号的空间模式中解码的。结果表明,从正面(PMC,M1)和顶区(SPL,IPL,IPS)的BOLD信号的空间模式中,可以将运动图像的内容(即动作类型)解码为明显高于偶然水平。探照灯的探索性分析显示,运动和与运动相关的皮层以及视觉皮层都有明显的簇。因此,这些数据提供了证据,证明运动前和后顶叶皮质内的活动模式会随着所设想的特定手部动作而系统地变化。 (C)2015作者。人脑图谱由Wiley Periodicals,Inc.发布

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