Figure 3.

Session structure. Each subject was trained on both tasks on the day before the fMRI session. Whether the first task was rewarded or not, whether it contained circle or line stimuli, and whether the optimal decision bound had a positive or negative slope was randomized across subjects. Training ended independently for both tasks after the subject reached an accuracy rate of 80% within a single block. During the fMRI session, the two trained tasks were presented alternatingly in four blocks of 50 trials each.