Figure 3.

Simulated activation of an axon. Simulated activation of a long straight myelinated axon (diameter 10 µm) with the pulse waveforms with 2.5‐, 15‐, 30‐, and 60‐µs hold periods from Figure 1b. The membrane potential and the gating variables $n$, $m$, and $h$ are shown for the node with the strongest initial activation, that is, the node with the largest electric field gradient. For each waveform, the data are plotted for the lowest stimulation intensity to evoke an action potential