External brain stimulation temporarily improves motor symptoms in Parkinson'sDate:September 9, 2015. Source:Johns Hopkins Medine

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Interesting study: sciencedaily.com/releases/2...

The Hopkins study with a small group of 20 patients with PD demonstrated that stimulation produced an average improvement of 25 percent in the motor symptoms of the patients, as quantified via the motor component of the Unified Parkinson's Disease Rating Scale (UPDRS), particularly improving rigidity on the affected side. It was temporary but appears to be a simple device that could be used at home. I can't see if there are follow up studies or trials.