Figure 2. Learning curves for acquisition and transition to new contexts.

In both Experiment 1 (top row) and Experiment 2 (bottom row), subjects acquire a robust preference for the objectively higher-value option (left). Following TYPE I transitions to a new context, they are initially indifferent between options, but then gradually re-learn to select the better option, despite occasionally returning to chance levels (middle). Following TYPE II transitions, subjects display a preference for the option with higher relative value, despite identical reinforcement histories (identical absolute value). It takes up to ten trials before this declines to indifference due to new learning. Solid lines represent mean, shaded areas s.e.m. across participants. x- and y axes are the same across all panels.