According to a study published in Journal of Neuroscience, high levels of dopamine make people more likely to act on impulse. Dopamine is the chemical in the brain involved with reward, motivation and learning through reinforcement. This finding may better explain disorders such as Attention Deficit/Hyperactivity Disorder (ADHD), which is characterized by high levels of dopamine and extremely impulsive behavior.
Scientists already know that sensory inputs such as smells, sights, sounds, anticipation and neutral cues associated with rewards boost dopamine levels and cause people to act more impulsively. However, this research helps understand why disorders associated with abnormal dopamine levels can lead to impulsive behavior.
Before scientists can prescribe medication lowering dopamine levels, they must be certain that the medication does not impair other important functions. Dopamine is responsible for a wide range of function in the brain, from movement to cognition.