Fig 12. Comparison of stimulation along ${\overrightarrow{w}}^{+}$ to a multi-electrode, constant amplitude strategy.

(a) The response probability when stimulating along ${\overrightarrow{w}}^{+}$ is compared to a naive strategy that uses only one electrode, or equal amplitude currents on two or three electrodes. (b) The naive strategy (S_N) is compared to stimulating along ${\overrightarrow{w}}^{+}$. Only the S_N resulting in the lowest thresholds are shown; single electrode (star), two electrodes (triangle) or three electrodes (circle).