Original sentence: , 2004, American Journal of Pharmacogenomics 4:83-92).Currently this chemical imbalance theory is the most widely accepted model of ADD/ADHD etiology in the scientific and medical community.New studies consider the possibility norepinephrine also plays a role.The stimulant medications used to treat the symptoms are all capable of either inhibiting the action of dopamine transporter (as methylphenidate does) or promoting the release of dopamine itself (as the amphetamine-class medications do).There is increasing evidence that variants in the gene for the dopamine transporter are related to the symptoms contributing to the diagnosis of ADHD (Roman et al.Therefore, it is theorized that stimulant medication allows the brain to enhance the effect of dopamine by blocking dopamine transporters or increasing the release of dopamine.This evidence is consonant with the theory of inefficacy of dopamine in people with ADD/ADHD; according to other recent studies, people with ADHD usually have relatively high dopamine transporter levels, which clears dopamine from between neurons before the full effect is gained from dopamine
Edited sentence: , 2004, Am J Pharmacogenomics 4:83-92).Currently this theory is the most widely accepted model of ADD/ADHD etiology in the scientific and medical community.New studies consider the possibility that norepinephrine also plays a role.The stimulant medications used to treat the disorder are all capable of either inhibiting the action of dopamine transporter (as methylphenidate does) or promoting the release of dopamine itself (as the amphetamine-class medications do).There is increasing evidence that variants in the gene for the dopamine transporter are related to the development of ADHD (Roman et al.Therefore, it is theorized that stimulant medication allows the brain to enhance the effect of dopamine more efficiently by blocking the dopamine transporters or increasing the release of dopamine.This evidenceis consonant with the theory of inefficacy of dopamine in people with ADD/ADHD, as according to other recent studies, people with ADHD usually have an abnormally high amount of dopamine transporter, which clears dopamine from between neurons before the full effect is gained from the dopamine