Figure 3. Simulated electric field in the h = 0 µm (A–C) and h = 100 µm (D–F) plane, as well as electric potential (G–I) in an xz-plane (see figure 1) during multielectrode stimulation for the following electrode configurations: MP (A, D and G), QMP at a QMPF of 0.5 (B, E and H), and hexagonal (C, F and I).

The isopotential contours are equi-spaced, ranging from 0.05 to 0.7 V in steps of 0.01 V, with the higher potentials occurring in the plane of the electrode array. Threshold current, I_th, is shown in the upper left corner of each panel. Electrode diameter and center-to-center electrode spacing were 50 µm and 55 µm, respectively. Note that the panels G-I are zoomed in views of the volume conductor domain.