Effects on the Brain (IMAGE) Brown University Caption A new study used MRI to show how ADHD drugs affect the brains of healthy people. The study found that the drugs were associated with a surge in the neurotransmitter glutamate in key regions of the brain. That surge was associated with reports of positive emotion. Credit White Lab / Brown University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.