CAPS, U1093 INSERM, Université de Bourgogne Franche-Comté, Faculté des Sciences du Sport, Dijon, F-21078, France.
Functional Imaging Unit, Department of Diagnostic Radiology and Neuroradiology, University Medicine, University of Greifswald, Greifswald, Germany.
Hum Brain Mapp. 2018 Apr;39(4):1805-1813. doi: 10.1002/hbm.23956. Epub 2018 Jan 10.
Motor imagery (MI) is the mental simulation of action frequently used by professionals in different fields. However, with respect to performance, well-controlled functional imaging studies on MI training are sparse. We investigated changes in fMRI representation going along with performance changes of a finger sequence (error and velocity) after MI training in 48 healthy young volunteers. Before training, we tested the vividness of kinesthetic and visual imagery. During tests, participants were instructed to move or to imagine moving the fingers of the right hand in a specific order. During MI training, participants repeatedly imagined the sequence for 15 min. Imaging analysis was performed using a full-factorial design to assess brain changes due to imagery training. We also used regression analyses to identify those who profited from training (performance outcome and gain) with initial imagery scores (vividness) and fMRI activation magnitude during MI at pre-test (MI ). After training, error rate decreased and velocity increased. We combined both parameters into a common performance index. FMRI activation in the left inferior parietal lobe (IPL) was associated with MI and increased over time. In addition, fMRI activation in the right IPL during MI was associated with high initial kinesthetic vividness. High kinesthetic imagery vividness predicted a high performance after training. In contrast, occipital activation, associated with visual imagery strategies, showed a negative predictive value for performance. Our data echo the importance of high kinesthetic vividness for MI training outcome and consider IPL as a key area during MI and through MI training.
运动想象（MI）是一种常见的动作心理模拟，被不同领域的专业人员广泛应用。然而，在表现方面，经过严格控制的 MI 训练功能成像研究仍然很少。我们调查了 48 名健康年轻志愿者在 MI 训练后，手指序列（错误和速度）的 MI 训练伴随的 fMRI 表现变化。在训练之前，我们测试了运动和视觉想象的生动度。在测试期间，参与者被指示移动或想象右手手指以特定顺序移动。在 MI 训练期间，参与者反复想象该序列 15 分钟。使用完全因子设计进行成像分析，以评估由于想象训练而导致的大脑变化。我们还使用回归分析来识别那些从初始想象得分（生动度）和 MI 前测试时的 fMRI 激活幅度（MI ）中受益的人（表现结果和收益）。训练后，错误率降低，速度提高。我们将这两个参数组合成一个共同的性能指标。左顶下小叶（IPL）的 fMRI 激活与 MI 相关，并随时间增加。此外，MI 期间右 IPL 的 fMRI 激活与高初始运动想象生动度相关。高运动想象生动度预测训练后的高表现。相比之下，与视觉想象策略相关的枕叶激活对表现具有负预测值。我们的数据呼应了高运动想象生动度对 MI 训练结果的重要性，并认为 IPL 是 MI 和 MI 训练期间的关键区域。
