A pacemaker-like device that stimulates the brain can help control some of the muscular problems brought on by Parkinson’s disease, the second most common neurodegenerative problem in America. A report in tomorrow’s New England Journal of Medicine may prompt doctors to recommend its use sooner rather than later. For more than a decade, deep-brain stimulation has been used to help control Parkinson’s symptoms. It involves placing a tiny wire called a lead (pronounced leed) in the part of the brain that controls movement and a matchbook-sized stimulator under the skin below the collarbone. The lead and stimulator are connected to each other by a second wire that runs under the skin of the shoulder, neck, and head. The device emits small pulses of electricity that help coordinate movement. Deep-brain stimulation traditionally isn’t used until a person has lived with Parkinson’s for a decade or more. The new report in the NEJM will give doctors more leeway to use this therapy earlier in people with Parkinson’s.