The activating function for magnetic stimulation derived from a three-dimensional volume conductor model.
A three-dimensional volume conductor model of magnetic stimulation is proposed that relates transmembrane potential of an axon to the induced electric field in a uniform volume conductor. This model validates assumptions used to derive a one-dimensional cable model of magnetic stimulation (Roth & Basser, IEEE Trans. Biomed. Eng., vol. 37, pp. 588-597, 1990) of unmyelinated axons. The three-dimensional volume conductor model reduces to this one-dimensional cable equation forced by the activating function, -delta EzA/delta z.
Basser
P J
PJ
Biomedical Engineering and Instrumentation Program, National Institutes of Health, Bethesda, MD 20892.
Wijesinghe
R S
RS
Roth
B J
BJ
D001369:Axons / Q000502:physiology*; D004574:Electromagnetic Fields; D008280:Magnetics; D008564:Membrane Potentials; D008959:Models, Neurological