Marty B, Bourguignon M, Jousmäki V, Wens V, Goldman S, De Tiège X
Laboratoire de Cartographie fonctionnelle du Cerveau, UNI - ULB Neuroscience Institute, Université libre de Bruxelles (ULB), 808 Route de Lennik, 1070, Brussels, Belgium.
Laboratoire Cognition Langage et Développement, UNI - ULB Neuroscience Institute, Université libre de Bruxelles (ULB), Brussels, Belgium.
Brain Topogr. 2018 Jul;31(4):566-576. doi: 10.1007/s10548-018-0634-y. Epub 2018 Feb 14.
This study investigates whether movement kinematics modulates similarly the rolandic α and β rhythm amplitude during executed and observed goal-directed hand movements. It also assesses if this modulation relates to the corticokinematic coherence (CKC), which is the coupling observed between cortical activity and movement kinematics during such motor actions. Magnetoencephalography (MEG) signals were recorded from 11 right-handed healthy subjects while they performed or observed an actor performing the same repetitive hand pinching action. Subjects' and actor's forefinger movements were monitored with an accelerometer. Coherence was computed between acceleration signals and the amplitude of α (8-12 Hz) or β (15-25 Hz) oscillations. The coherence was also evaluated between source-projected MEG signals and their β amplitude. Coherence was mainly observed between acceleration and the amplitude of β oscillations at movement frequency within bilateral primary sensorimotor (SM1) cortex with no difference between executed and observed movements. Cross-correlation between the amplitude of β oscillations at the SM1 cortex and movement acceleration was maximal when acceleration was delayed by ~ 100 ms, both during movement execution and observation. Coherence between source-projected MEG signals and their β amplitude during movement observation and execution was not significantly different from that during rest. This study shows that observing others' actions engages in the viewer's brain similar dynamic modulations of SM1 cortex β rhythm as during action execution. Results support the view that different neural mechanisms might account for this modulation and CKC. These two kinematic-related phenomena might help humans to understand how observed motor actions are actually performed.
本研究调查了在执行和观察目标导向的手部动作过程中，运动运动学是否以类似方式调节中央区α和β节律的振幅。研究还评估了这种调节是否与皮质运动学相干性（CKC）有关，CKC是指在这类运动动作中观察到的皮质活动与运动运动学之间的耦合。在11名右利手健康受试者执行或观察一名演员执行相同重复性手部捏取动作时，记录了他们的脑磁图（MEG）信号。用加速度计监测受试者和演员的食指运动。计算了加速度信号与α（8 - 12赫兹）或β（15 - 25赫兹）振荡振幅之间的相干性。还评估了源投射MEG信号与其β振幅之间的相干性。主要在双侧初级感觉运动（SM1）皮层内运动频率下的加速度与β振荡振幅之间观察到相干性，执行和观察的动作之间没有差异。在运动执行和观察过程中，当加速度延迟约100毫秒时，SM1皮层β振荡振幅与运动加速度之间的互相关性最大。运动观察和执行过程中源投射MEG信号与其β振幅之间的相干性与休息时相比无显著差异。本研究表明，观察他人的动作会使观察者大脑中SM1皮层β节律产生与动作执行过程中类似的动态调节。结果支持这样一种观点，即不同的神经机制可能解释这种调节和CKC。这两种与运动学相关的现象可能有助于人类理解观察到的运动动作实际上是如何执行的。
