Motor cortex excitability is tightly coupled to observed movements
Motor cortex excitability is tightly coupled to observed movements
复制标题
运动皮层兴奋性与观察到的运动紧密相关
DOI：
10.1016/j.neuropsychologia.2012.06.002
复制
发表时间：
2012
期刊：
影响因子：
2.6
通讯作者：
U. Castiello
中科院分区：
文献类型：
--
作者：
L. Sartori;G. Bucchioni;U. Castiello
虽然在动作观察过程中皮质脊髓（CS）系统的易化是一个被广泛接受的现象，它仍然是有争议的，如果易化反映了所观察到的运动学或张力的副本，以实现特定的目标。在这项研究中，从小指展肌（ADM）和第一骨间背侧肌（FDI）肌肉记录经颅磁刺激（TMS）诱导的运动诱发电位（MEP），同时参与者志愿者观察模型抓握引起精确抓握的小目标或引起指向孤立物体或两侧不同大小物体（即，分心物）。详细的运动分析表明，模型的运动学受到干扰器尺寸的影响。拍摄现场的视频剪辑被编辑成这样一种方式，即从现场移除干扰物。志愿者被要求观察相同的目标，但使用不同的运动模式进行的行动。虽然运动学的差异没有注意到的参与者志愿者，他们仍然引起了不同的配置皮质脊髓激活。在观察抓握动作时，细致的运动匹配似乎会在抓握者身上招募与实际执行动作的人相同的肌肉。这些效应似乎是由观察到的动作的非常微妙、难以察觉的方面引起的，这些方面指向一种精心调整的机制，专门编码身体部位。
Although facilitation of the corticospinal (CS) system during action observation is a widely accepted phenomenon, it is still controversial if facilitation reflects the replica of observed movement kinematics or the tension to achieve a particular goal. In this study, transcranial magnetic stimulation (TMS)-induced motor evoked potentials (MEPs) were recorded from the abductor digiti minimi (ADM) and the first dorsal interosseus (FDI) muscles while participant–volunteers observed a model grasping a small target eliciting a precision grip or a large target eliciting a whole hand grasp directed toward an isolated object or flanked by different sized objects (i.e., distractor). A detailed movement analysis revealed that the model's kinematics were influenced by the distractor's size. Video clips filming the scene were edited in such a way that the distractor was removed from the scene. Participant–volunteers were asked to observe actions characterized by the same goal but performed using different kinematical patterns. Although the differences in movement kinematics were not noticed by the participant-volunteers, they nonetheless elicited distinct configurations of corticospinal activation. Detailed motor matching seems to recruit the same muscles in the onlooker as in the person actually carrying out the action during observation of grasping actions. These effects appear to be elicited by very subtle, imperceptible aspects of observed actions pointing to a finely tuned mechanism that specifically encodes body parts.
影响因子：
2.1
作者：
Grafton, Scott T.;Hamilton, Antonia F. de C.
通讯作者：
Hamilton, Antonia F. de C.
影响因子：
2.5
作者：
Maeda, F;Kleiner-Fisman, G;Pascual-Leone, A
通讯作者：
Pascual-Leone, A