Noble Jeremy W, Eng Janice J, Boyd Lara A
Department of Physical Therapy, and the GF Strong Rehab Centre, University of British Columbia, Vancouver, BC, Canada.
Motor Control. 2013 Jul;17(3):298-312. doi: 10.1123/mcj.17.3.298. Epub 2013 Jun 10.
This study examined the effect of visual feedback and force level on the neural mechanisms responsible for the performance of a motor task. We used a voxel-wise fMRI approach to determine the effect of visual feedback (with and without) during a grip force task at 35% and 70% of maximum voluntary contraction. Two areas (contralateral rostral premotor cortex and putamen) displayed an interaction between force and feedback conditions. When the main effect of feedback condition was analyzed, higher activation when visual feedback was available was found in 22 of the 24 active brain areas, while the two other regions (contralateral lingual gyrus and ipsilateral precuneus) showed greater levels of activity when no visual feedback was available. The results suggest that there is a potentially confounding influence of visual feedback on brain activation during a motor task, and for some regions, this is dependent on the level of force applied.
本研究考察了视觉反馈和力的水平对执行运动任务的神经机制的影响。我们采用体素水平的功能磁共振成像方法，来确定在最大自主收缩的35%和70%的握力任务期间视觉反馈（有和无）的影响。两个区域（对侧吻侧运动前皮层和壳核）表现出了力和反馈条件之间的相互作用。当分析反馈条件的主效应时，在24个活跃脑区中的22个区域发现，有视觉反馈时激活程度更高，而另外两个区域（对侧舌回和同侧楔前叶）在没有视觉反馈时表现出更高的活动水平。结果表明，在运动任务期间视觉反馈对大脑激活存在潜在的混杂影响，并且对于某些区域，这种影响取决于所施加力的水平。
