A new international study has identified a specific brain network as the main driver of Parkinson's disease. This network is over-connected, which disrupts movement, thinking and other bodily functions. The researchers found these changes in patients with Parkinson's disease. With non-invasive brain stimulation targeting this network, patients showed much greater improvement in symptoms compared to conventional stimulation. This discovery could change the way Parkinson's disease is diagnosed. It could also affect the treatment of the disease.