Day B L, Thompson P D, Dick J P, Nakashima K, Marsden C D
Neurosci Lett. 1987 Mar 20;75(1):101-6. doi: 10.1016/0304-3940(87)90083-8.
The latency of the surface recorded electromyographic response to either an electrical or magnetic stimulus applied to the scalp has been measured in the first dorsal interosseous and abductor pollicis brevis muscles of 3 subjects. In the contracting muscle the response latency to the magnetic stimulus was longer by 1.4-2.7 ms compared to the electrical stimulus. Poststimulus time histograms of the firing of single motor units of first dorsal interosseous muscle were studied in 4 subjects. The first period of increased probability of firing of the single motor units showed a similar latency difference (mean 2.8 ms) to the two modes of stimulation. It is concluded that the extra delay to magnetic stimulation is consumed in central motor pathways. This implies that the two modes of stimulation activate the brain at different sites. It is suggested that the magnetic stimulus excites the corticospinal neurones transynaptically, whereas the electrical stimulus excites these neurones directly.
在3名受试者的第一背侧骨间肌和拇短展肌中，测量了对施加于头皮的电刺激或磁刺激的表面记录肌电图反应的潜伏期。在收缩的肌肉中，与电刺激相比，磁刺激的反应潜伏期长1.4 - 2.7毫秒。在4名受试者中研究了第一背侧骨间肌单个运动单位放电的刺激后时间直方图。单个运动单位放电概率增加的第一个时期显示出与两种刺激模式相似的潜伏期差异（平均2.8毫秒）。得出的结论是，磁刺激的额外延迟消耗在中枢运动通路中。这意味着两种刺激模式在不同部位激活大脑。有人提出，磁刺激通过突触间激发皮质脊髓神经元，而电刺激则直接激发这些神经元。
