University of Washington researcher Theodore Beauchaine has found differences in the brain activity of teenage boys with ADHD. Functional Magnetic Resonance Imaging (fMRI) was used to examine brain activity of teens with and without ADHD. Two brain areas were the focus of the study. The striatal region is involved in motivating people to engage in behaviour that is pleasurable or rewarding. The anterior cingulate cortex is activated when the reward stops – it “extinguishes” behaviour that is no longer rewarding.