How are observed actions mapped to the observer's motor system? Influence of posture and perspective
How are observed actions mapped to the observer's motor system? Influence of posture and perspective
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DOI：
10.1016/j.neuropsychologia.2008.09.012
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发表时间：
2009-01-01
期刊：
影响因子：
2.6
通讯作者：
Wenderoth, Nicole
中科院分区：
文献类型：
--
作者：
Alaerts, Kaat;Heremans, Elke;Wenderoth, Nicole
先前使用经颅磁刺激（TMS）的研究表明，在观察他人的动作时，观察者的初级运动皮层（M1）以高度肌肉特异性的方式变得容易。本研究采用经颅磁刺激（TMS）探讨了姿势、视角和体侧对左侧M1肌特异性易化的影响。受试者观看视频的显示左，右手伸展（手掌向下）的运动，从第一人称或第三人称的角度与他们的手的姿势一致（手掌向下）或不一致（手掌向上）的姿势观察model.Data表明，促进左M1的观察与右（对侧）或左（同侧）的手执行的行动是有很大不同。对于右手动作，左侧M1的易化被证明对观察到的动作（“内在映射”）中使用的肌肉具有高度特异性。在观察左手刺激时，只有一半的受试者表现出这种肌肉特异性易化，而在另一半受试者中，M1根据观察到的运动方向（“外在映射”）被促进。绝对效应幅度特别高时，右手的行动，从第一人称的角度来看，而左手的行动，第三人称的角度是更有效的。观察者和观察模型的身体部位之间的姿势一致性的程度只轻微影响M1的促进。由于行动观察越来越多地被认为是在康复治疗，目前的研究结果可能有助于确定最有效的条件，刺激运动系统在行动观察。(C)2008爱思唯尔有限公司保留所有权利。
Previous studies using transcranial magnetic stimulation (TMS) have shown that during the observation of actions performed by others, the observer's primary motor cortex (M1) becomes facilitated in a highly muscle specific fashion. Here, we used TMS to explore the effect of posture, perspective and body side on muscle specific facilitation of left M1. Subjects viewed video's showing left and right hand extension (palm-down) movements from a first person or third person perspective with their hand posture either congruent (palm-down) or incongruent (palm-up) to the posture of the observed model.Data indicated that facilitation of left M1 was substantially different for observing actions executed with the right (contralateral) or left (ipsilateral) hand. For right hand actions, facilitation of left M1 was shown to be highly specific to the muscle used in the observed action ('intrinsic mapping'). During the observation of left hand stimuli, only half of the subjects displayed this muscle specific facilitation, whereas in the other half, M1 was facilitated according to the observed movement direction ('extrinsic mapping'). Absolute effect magnitude was particularly high when right hand actions were observed from a first person perspective, whereas, for left hand actions, the third person perspective was more efficient. The degree of postural congruency between body parts of the observer and observed model only mildly influenced M1 facilitation. Since action observation is increasingly considered in rehabilitation therapies, the present findings may help identifying the most effective conditions for stimulating the motor system during action observation. (C) 2008 Elsevier Ltd. All rights reserved.