Parkinson's, Tourette Syndrome and Depression. They are a debilitating disease and they also share something else in common, a surplus or deficiency of neurochemicals in the brain. Now, researchers have found a novel way to monitor real-time chemical changes in the brains of patients undergoing deep brain stimulation. The research conducted by the Mayo Clinic will help physicians more effectively use DBS to treat brain disorders. "We can learn what neurochemicals can be released by DBS, neurochemical stimulation, or other stimulation. We can basically learn how the brain works," author Su-Youne Chang, Ph.D., of the Mayo Clinic Neurosurgery Department was quoted saying.