Hammond Geoffrey R, Vallence Ann-Maree
School of Psychology, University of Western Australia, Crawley, Western Australia, Australia.
Neuroreport. 2006 May 29;17(8):805-7. doi: 10.1097/01.wnr.0000220125.55855.98.
Use-dependent facilitation of motor-evoked potentials evoked by transcranial magnetic stimulation with repetition of simple movements has been well established. Motor-evoked potentials were recorded from two intrinsic hand muscles before and after blocks of motor practice in which study participants made repeated ballistic pinch responses with either their left or their right hand. Despite similar increases in behavioral performance by each hand (measured by the peak acceleration of the force generated by the index finger), practice-related increases in the amplitude of the motor-evoked potentials were greater in the left than in the right motor cortex of right-handed participants. This finding supports the hypothesis that the dominant motor cortex has a greater ability to reorganize with experience than the non-dominant motor cortex.
经颅磁刺激诱发的运动诱发电位在重复简单动作时的使用依赖性易化作用已得到充分证实。在运动练习组块前后，从手部两块固有肌记录运动诱发电位，研究参与者用左手或右手进行重复的弹道式捏合反应。尽管每只手的行为表现都有类似程度的提高（通过食指产生的力的峰值加速度来衡量），但在右利手参与者中，与练习相关的运动诱发电位幅度增加在左侧运动皮层比右侧运动皮层更大。这一发现支持了以下假设：优势运动皮层比非优势运动皮层具有更强的随经验重组的能力。
