[Simnibs-discuss] what is essence of TMS. Or TMS mechanism

[刘习杰]

Dear friends,


If you are familiar with it， please answer.


Recently, I am studying the comparison between Transcranial Magnetic Stimulation (TMS) and tDCS. The essence of TMS is the magnetic modulation, is it right? Or is the essence of TMS the promotion of blood flow by a magnetic field? So, like the magnetic field in MRI, the magnetic field force rotatations of all electrons in the same direction?


Or does TMS work by inducting electric fields and currents? But the frequency of TMS is only 1-25 Hz. 


There's an explanation, saying TMS is delivered to the brain by passing a strong brief electrical current through an insulated wire coil placed on the skull. This rapid phasic current flow generates a transient magnetic field, which propagates in space and in turn induces a secondary current in the brain that is capable of depolarising neurons if the coil is held over the subject’s head (Pascual-Leone et al., 2002).



Thanks and Bests,


Jesse
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