Figure 10.

Schematic representation of how two interacting electrodes can reduce the number of independent neural or functional channels, which are represented by an array of arrows. The upper panel shows a case of two totally independent electrodes with each stimulating an independent neural channel (shaded rectangles) via relatively small degree of electric field spread (circles). The lower panel shows a case of two totally dependent electrodes with both stimulating the same neural channel via relatively large degree of electric field spread.