The effect of increasing pulse amplitude. (a) Example of expansion with activation of a greater area with increasing pulse amplitude, while maintaining activation in the original area. This result was from Subject 13 on the ulnar nerve stimulating at 300µs. (b) Example of relocation with activation of equal or greater area with differences in location. This result was from Subject LE10 stimulating at 100µs. The labels indicate the order in which locations were felt with increasing pulse amplitude (PA).