Figure 5.

Point-to-reference and point-to-point mapping. The relative muscle activity was defined as the amplitude observed at a given level normalized to the maximal amplitude observed through an entire mapping session. The graph displays relative muscle activity at each spinal position using (i) point-to-reference and (ii) point-to-point stimulation modalities. *Measurements were collected at 1.5 mm increments so there are rostral and caudal measurements at each spinal segment except for T1 where there is a single rostral measurement. The difference in the distribution of activated muscles at each position reveals dramatically different responses at each spinal level using each technique.