Participants selected one of three choice stimuli (slot machines) on each trial by reaching to one of them using a digital tablet in the fMRI scanner. Three trial outcomes were possible: On Rew+ trials (bottom left, green), the cursor hit the selected stimulus and a monetary reward was received; on Rew− trials (bottom middle, orange), the cursor hit the stimulus but no reward was received; on Miss trials (bottom right, purple), the cursor was shown landing outside the selected stimulus and no reward was received.