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. 2011 Mar 24;7(3):e1002022. doi: 10.1371/journal.pcbi.1002022

Figure 3. Factors affecting magnetic stimulation of peripheral axons.

Figure 3

A straight axon was located in a plane below the coil and the coil was shifted along the y-axis by one coil radius. Distance from the plane of the coil was 1 cm, coil radius was 2 cm, 30 loops to the coil. The underdamped pulse was used (R = 0.09 Ω; L = 13 µH; C = 200 µF; τ = 0.4 ms). Nernst potentials, conductances, membrane capacitance and resistivity of axoplasm were all equal to NEURON's default of the Hodgkin-Huxley model. A, Magnetic threshold as a function of fiber diameter shown on a log-log scale. The line is a curve fit of Vth = a+b/d2 where Vth is the magnetic threshold, a and b are proportionality constants and d is the fiber diameter B, Magnetic threshold as a function of shifting the coil along the y-axis. Distance from the axon was measured with respect to the center of the coil. Axon diameter was 100 µm.