Figure 2.

The value of the activating function in the, z, direction were was calculated at points along the long solid lines, parallel to the electrode surface. These lines lie, r, away from the active surface. The distributions were centred around a line perpendicular from the middle of the active segment on the electrode, shown as d = 0. (A) Conical electrodes, (B) Annular electrodes, (C) Striped electrodes. (D) Value of the activation function for the 100-μm annular electrode at r = 500 μm when supplied with 25 μA, as calculated along the line parallel to the electrode surface shown in (B).