New technique lets researchers control brain cells without the need for surgery

http://www.wired.co.uk/article/control-brain-cells-without-surgery
Researchers have come a step closer to treating diseases like Parkinson’s and epilepsy, without the need to place an implant into the brain.
These days, many regions in the brain can be modulated by electricity to help improve brain function, in a technique already used to treat Parkinson’s and epilepsy. But because these cells tend to be deep in the brain, controlling them requires neurosurgical implants. 
“If we could noninvasively stimulate deep regions, without hitting overlying regions, we might be able to help more people because we could stimulate deep regions selectively, without needing surgery,” Ed Boyden, professor at the Massachusetts Institute of Technology and co-author of the new paper, told WIRED.