Figure 5.

Effective electric field, E_s, along neurons P1-P4 (a-d) for both the homogeneous (dashed line) and heterogeneous models (solid line). The inset in (a) shows the effective electric field along the collateral of the axon of neuron P1. The effective electric field is shown at the time instant when it is maximum (maximum current time derivative of 67 A/μs). The arrows on the graphics indicate the most important features of E_s and the position of the soma (letter “s”). The position along the neuron where these features occur can be seen in the representation of the position of the neurons in the cortex that is shown in each figure.