Fig. 9.

Gauging interchangeability. Amplitude (A), peak velocity (B), and inverse latency (C) values (black circles) paired by matching the total charge that evoked the properties within each data set (n = 30). Within each pair, the values evoked by total charge calculated from parameter combinations where frequency (divided by 10) was greater than current intensity was plotted on the x-axis; current intensity greater than frequency (divided by 10) was plotted on the y-axis. A linear regression line (gray) was fitted to each distribution; dashed black line represents line of unity. Inset: distribution of residual error from the line of unity. Dashed gray line illustrates the median of the error distribution (light gray); black line centered at zero. Residual error was computed as the Euclidean distance between each point and its projection on the line of unity.