Seth Batten audio (AUDIO) Virginia Tech Your browser does not support the audio element. Caption Audio quote of Seth Batten, a researcher at the Fralin Biomedical Research Institute, describing a study in which researchers recorded dopamine and serotonin levels in the substantia nigra pars reticulata of patients with Parkinson’s disease undergoing DBS surgery. Credit Clayton Metz/Virginia Tech Usage Restrictions None License Original 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.