Plots showing the nine individual ACHM subjects' rate constant (inverse minutes) versus final threshold (dB), in each of the four condition sets tested (indicated by plot title). The 95% CI for the mean of these parameters measured in the normal subjects is shown for comparison (checkered ellipse). There is a statistically significant positive correlation between final threshold and rate constant in one of the four condition sets tested (9,9 position, size III stimulus; Spearman r = 0.72; P = 0.037), see text for further discussion. Subject key: Subject 1, filled square; Subject 2, filled circle; Subject 3, empty circle; Subject 4, empty diamond; Subject 5, filled diamond; Subject 6, empty square; Subject 7, filled triangle; Subject 8, empty triangle; Subject 9, half-filled diamond.