Pfurtscheller G, Stancák A, Edlinger G
Ludwig Boltzmann-Institute of Medical Informatics and Neuroinformatics, Graz, Austria.
Electroencephalogr Clin Neurophysiol. 1997 Apr;102(4):316-25. doi: 10.1016/s0013-4694(96)96612-2.
EEGs were recorded from sensorimotor areas of 12 subjects performing unilateral self-paced brisk and slow finger movements. Two different beta components were found below 30 Hz: (i) One component, at about twice the frequency of the mu rhythm, showed desynchronization in parallel with the mu rhythm starting at about 2 s prior to movement. Measurements of bicoherence have shown that this beta component can be non-linearly related to the arch-shaped mu rhythm. (ii) Another beta component started to desynchronize about 1 s prior to movement, recovered very fast and displayed a pronounced post-movement beta synchronization (PMBS) within the first second after movement-offset. This PMBS was found in the frequency band between 12 and 26 Hz. The average percentage power increase at contralateral sensorimotor area was 232% (SD = 82%) for brisk and 265% (SD = 102%) for slow movements. The PMBS was of contralateral dominance and is interpreted as a correlate of active inhibition or idling of the primary motor area following movement execution.
对12名进行单侧自定步速的快速和慢速手指运动的受试者的感觉运动区进行了脑电图记录。在30Hz以下发现了两种不同的β成分：（i）一种成分，频率约为μ节律的两倍，在运动前约2秒开始与μ节律同步去同步化。双相干测量表明，这种β成分可能与拱形μ节律呈非线性关系。（ii）另一种β成分在运动前约1秒开始去同步化，恢复很快，并在运动停止后的第一秒内显示出明显的运动后β同步化（PMBS）。这种PMBS出现在12至26Hz的频段内。快速运动时，对侧感觉运动区的平均功率增加百分比为232%（标准差=82%），慢速运动时为265%（标准差=102%）。PMBS具有对侧优势，被解释为运动执行后初级运动区主动抑制或闲置的相关指标。
