Neurological Clinic, Institute of Psychology, University of Freiburg, 79106 Freiburg, Germany.
Cereb Cortex. 2012 Mar;22(3):628-38. doi: 10.1093/cercor/bhr147. Epub 2011 Jun 17.
In the investigation of corticomuscular coherence (CMC), it remained unclear why some subjects do not present significant CMC. We predicted that such subjects will develop CMC as a result of learning as indexed by improved performance during a visuomotor task. We investigated CMC, cortical motor spectral power (SP), and performance in 14 subjects during isometric compensation of a static force or dynamic force (DF) with their right index finger. We compared data from the beginning of the experiment (Time-Period 1) and after learning (Time-Period 2). Eight subjects (Group CMC++) presented CMC during Period 1 which increased during Period 2. Six subjects (Group CMC-+) presented CMC only during Period 2. Group CMC-+ was "more desynchronized" (lower SP, and stronger task-related desynchronization) than Group CMC++. The performance was better in Group CMC++ than in Group CMC-+. Learning was associated with higher SP, higher CMC, and better performance in both groups. However, in the more complicated DF condition, Group CMC++ learned better than Group CMC-+. The present study demonstrates the presence of CMC in all subjects tested and evidence that this is due to the fact that individuals may fall into 2 different groups in terms of oscillatory motor control: Group CMC-+ presents CMC only after learning.
在皮质肌层相干性（CMC）的研究中，有些受试者没有表现出明显的 CMC，其原因仍不清楚。我们预测，这些受试者将通过视觉运动任务中的表现改善（表现为学习效果）来产生 CMC。我们研究了 14 名受试者在使用右食指进行等长补偿静态力或动态力（DF）时的 CMC、皮质运动谱功率（SP）和表现。我们比较了实验开始时（第 1 时间期）和学习后的（第 2 时间期）的数据。8 名受试者（CMC++组）在第 1 期表现出 CMC，在第 2 期增加。6 名受试者（CMC+-组）仅在第 2 期表现出 CMC。CMC+-组比 CMC++组更“去同步化”（较低的 SP 和更强的与任务相关的去同步化）。CMC++组的表现优于 CMC+-组。学习与两组的更高 SP、更高 CMC 和更好的表现相关。然而，在更复杂的 DF 条件下，CMC++组的学习效果优于 CMC+-组。本研究表明，所有接受测试的受试者都存在 CMC，并且这是由于个体在振荡运动控制方面可能分为 2 个不同的组：CMC+-组仅在学习后才表现出 CMC。
