We do a fair bit of basic research on deep brain stimulation.
One of the remarkable advances in research related to this issue is using light to stimulate the brain. You have an electric pacemaker. Now you can transform the cells by introducing a particular gene that builds ion channels, and you shed light on those cells. You can selectively stimulate only one type of cell and not the other. It's very selective. It has been used in animal models to replace deep brain stimulation. So there's hope to do it.