Scientists may have identified the specific brain network responsible for Parkinson’s disease. Researchers found that a system called the somato-cognitive action network (SCAN) acts as the neurological foundation for the condition. This network is marked by hyperconnectivity, meaning it is overly active in its links to the subcortex, a deep region of the brain. In a small trial, doctors tested an experimental therapy using transcranial magnetic stimulation, which uses magnets to influence brain activity. By targeting the SCAN, they more than doubled the improvement in symptoms compared to results from stimulating nearby areas. The findings, published in the journal Nature, challenge old assumptions and suggest a path toward more precise treatments.