Overexcited Neurons (IMAGE) Duke University Caption Overactive neurons in the front of the mouse brain, shown in green, trigger excessive release of the brain chemical dopamine, which causes motor abnormalities. Credit Soderling lab, Duke 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.