Figure 1.

a, Concurrent discrimination task. In a set of 50 items, subjects are presented with a pair of words, one of which is designated the target (i.e., correct). Subjects choose the word and receive visual feedback. The set of 50 items is repeated 8 times total (8 Rounds), during which subjects learn the correct choices. b, Average accuracy across rounds (left panel) and response time across rounds (right panel) is plotted for the task participants (empirical) and for simulations of a drift-diffusion model (simulated) (see Table 1). Shaded area reflects standard error of the means. c, Threshold (left) and drift-rate (right) parameters across rounds of the drift-diffusion model fit from task behavior (see Table 1).