The effects of methylphenidate on brain processes for decision making in adult attention deficit hyperactivity disorder

To investigate the effects of methylphenidate on behavioural processes and brain mechanisms involved in decision making and instrumental in adults with ADHD. We will be testing patients on and off their already prescribed medication dose while they are performing a value-based decision making task and/or an instrumental learning task, either in an MRI-scanner (to document the effects of methylphenidate on decision making and the brain processes associated with this) or without MRI in a pure behavioural arm.