(a) Performance on between-category versus within-category pairs by the control and training groups. (b) Performance on pairs differing only on the irrelevant versus the relevant dimension by the control and training groups. In both panels, the large graph on the left shows the overall interaction across task type. The three graphs in the middle show the interaction for each task, and the six smaller graphs on the right show the interaction for each task and each stimulus type. Higher scores on the Y axis represent greater differentiation between items.