Quantile-Probability plots for data from Participants 1 and 2 and predictions from the best-fitting model in Experiment 1. RT points are plotted in quantile ascending order, from .1 to .9. From left to right, the 3 columns across error responses represent easy, medium, and difficult stimuli, followed by difficult, medium, and easy data points across correct responses. Model variant label abbreviates the model’s structure: A = accumulator (without decay); T = ter; C = criterion; eS = equal starting point.