Fig. 6.

Spike initiation sites depend on stimulus pulse type. The left side illustrates the compartment model of a target neuron with spike origin (horizontal arrows) at threshold for four different pulses. Stimulating electrode E1. Traveling APs are plotted at the right. Each line represents the temporal change in transmembrane potential. The top line is the neurons peripheral end, the soma is always plotted in yellow. The values for the time at which the spike occurs at the IS, the soma and the end of the model neuron are given in ms and they are marked by vertical arrows.