Localization of the Reward Positivity to ACC

Patients will have to perform the virtual T-maze task, which is known to elicit reward positivity. During this task, the patients will see a virtual T-maze on a computer screen and have to choose at every junction whether they go right or left. Depending on the direction they choose, they either get positive or negative feedback (reward or no reward). This feedback is chosen completely at random, on a 50% reward/50% no reward basis.