Berardelli A, Inghilleri M, Cruccu G, Manfredi M
Dipartimento Scienze Neurologische, Universitá di Roma La Sapienza, Italy.
Neurosci Lett. 1990 Apr 20;112(1):54-8. doi: 10.1016/0304-3940(90)90321-y.
The descending volley evoked by electrical and magnetic transcranial stimulation was recorded with spinal electrodes in 3 subjects undergoing spinal surgery. The descending volley evoked by electrical stimulation, as previously described, was composed by a short-latency initial wave followed by later waves. In two subjects magnetic stimulation evoked an initial wave of slightly longer latency (0.2-0.3 ms), smaller amplitude and higher threshold than the initial wave evoked by electrical stimulation. In these two subjects, magnetic stimuli probably activated the pyramidal axons directly. In the third subject the initial wave evoked by magnetic stimulation had a latency of 1.4 ms longer and a considerably smaller amplitude than that evoked by electrical stimulation. In this case magnetic stimulation may activate the pyramidal axons indirectly.
在3名接受脊柱手术的受试者中，用脊髓电极记录了经颅电刺激和磁刺激诱发的下行波群。如前所述，电刺激诱发的下行波群由一个短潜伏期的初始波和随后的波组成。在两名受试者中，磁刺激诱发的初始波潜伏期略长（0.2 - 0.3毫秒），振幅较小，阈值高于电刺激诱发的初始波。在这两名受试者中，磁刺激可能直接激活了锥体轴突。在第三名受试者中，磁刺激诱发的初始波潜伏期比电刺激诱发的长1.4毫秒，振幅明显较小。在这种情况下，磁刺激可能间接激活了锥体轴突。
