The prefrontal cortex, which is located in the front of the brain, is thought to be the brain's command center and regulates the ability to inhibit responses. The caudate nucleus and the globus pallidus. The caudate nucleus and globus pallidus, located near the center of the brain, speed up or stop orders coming from the prefrontal cortex. Abnormalities in these areas may impair a person's ability to brake actions, resulting in the impulsivity typical of ADHD people. They include norepinephrine, dopamine, and serotonin.
Dopamine is under particular scrutiny.
Nerve Pathways . Another area of interest is a network of nerves called the basal-ganglia thalamocortical pathways. Abnormalities along this neural route have been associated with ADHD, Tourette's syndrome, and obsessive-compulsive disorders, which all share certain symptoms. Problems Surrounding Pregnancy ADHD is often associated with problem pregnancies and with difficult deliveries. Most likely more than one gene is responsible for inherited cases.