Gibson Raechelle M, Chennu Srivas, Owen Adrian M, Cruse Damian
The Brain and Mind Institute, Department of Psychology, Western University, London, Ont., Canada.
Department of Clinical Neurosciences, University of Cambridge, Cambridge, UK.
Clin Neurophysiol. 2014 Aug;125(8):1556-67. doi: 10.1016/j.clinph.2013.11.034. Epub 2013 Dec 13.
We sought to determine whether the sensorimotor rhythms (SMR) elicited during motor imagery (MI) of complex and familiar actions could be more reliably detected with electroencephalography (EEG), and subsequently classified on a single-trial basis, than those elicited during relatively simpler imagined actions.
Groups of healthy volunteers, including experienced pianists and ice hockey players, performed MI of varying complexity and familiarity. Their electroencephalograms were recorded and compared using brain-computer interface (BCI) approaches and spectral analyses.
Relative to simple MI, significantly more participants produced classifiable SMR for complex MI. During MI of performance of a complex musical piece, the EEG of the experienced pianists was classified significantly more accurately than during MI of performance of a simpler musical piece. The accuracy of EEG classification was also significantly more sustained during complex MI.
MI of complex actions results in EEG responses that are more reliably classified for more individuals than MI of relatively simpler actions, and familiarity with actions enhances these responses in some cases.
The accuracy of SMR-based BCIs in non-communicative patients may be improved by employing familiar and complex actions. Increased sensitivity to MI may also improve diagnostic accuracy for severely brain-injured patients in a vegetative state.
我们试图确定，与相对简单的想象动作所引发的感觉运动节律（SMR）相比，在复杂且熟悉的动作的运动想象（MI）过程中引发的SMR是否能用脑电图（EEG）更可靠地检测到，并随后在单次试验的基础上进行分类。
包括经验丰富的钢琴家及冰球运动员在内的多组健康志愿者进行了不同复杂程度和熟悉程度的运动想象。使用脑机接口（BCI）方法和频谱分析记录并比较他们的脑电图。
相对于简单的运动想象，有显著更多的参与者在复杂运动想象中产生了可分类的SMR。在演奏一首复杂乐曲的运动想象过程中，经验丰富的钢琴家的脑电图分类准确率显著高于演奏较简单乐曲的运动想象过程。在复杂运动想象过程中，脑电图分类的准确率也更持久。
与相对简单动作的运动想象相比，复杂动作的运动想象能产生EEG反应，且更多个体的反应能被更可靠地分类，在某些情况下，对动作的熟悉程度会增强这些反应。
通过采用熟悉且复杂的动作，基于SMR的脑机接口在无交流能力患者中的准确性可能会提高。对运动想象增加的敏感性也可能提高对处于植物状态的严重脑损伤患者的诊断准确性。
