 This difference may be due to unusual functions of brain organization in stuttering adults and may be a result of how the stuttering adults performed language-relevant tasks.Furthermore, previous research has found that adults who stutter show cerebral hemispheres that contain uncommon brain proportions and allocations of gray and white matter tissue.Recent studies have found that adults who stutter have elevated levels of the neurotransmitter dopamine, and have thus found dopamine antagonists that reduce stuttering (see anti-stuttering medication below).