AROC for control and experimental conditions. The upper panel shows AROC using multivariate logistic regression analysis (LF), the middle panel shows AROC using univariate analysis of SNR at 2f1-f2 (SNR), and the bottom panel shows AROC using univariate analysis of distortion product level at 2f1-f2 (DP). Squares represent results for the control condition, circles represent the null-suppressor condition, upright triangles represent the low-suppressor condition, and inverted triangles represent the high-suppressor condition.