Fig. 3.

Visual search performance and model predictions. Correct and error response time quantiles from each monkey in the fast (green) and accurate (red) conditions are plotted as defective cumulative response time (RT) distributions in which each distribution asymptotes at the observed proportion of the respective type of trial. Accordingly, the distributions for correct trials asymptote at higher proportions than the distributions of error trials. Values predicted by the indicated gated accumulator model (GAM) architectures are plotted in black. Different architectures are distinguished along a 3 (model class: race, diffusion-like, competitive) × 4 [parameters varying between speed-accuracy tradeoff (SAT) conditions: no parameter (M_identical), gate and threshold (M_{gate,threshold}), gate only (M_gate), threshold only (M_threshold)]. Nonshaded subplots highlight best-fitting models. For monkey S, M_gate, and M_threshold were not fit because M_identical did not fit significantly worse than M_{gate,threshold}. For monkey Q, M_{gate,threshold} provided the best fit. For monkey Da M_{gate,threshold} and M_threshold provided indistinguishable best fits.