There's a great deal of attention and focus on devices with the potential to treat severe depression. And this area is widely considered to be one of the biggest future opportunities in medical technology. In particular, there is considerable scientific evidence to support neurostimulation as an effective treatment for this population. Electroconvulsive shock treatment is administered to over 100,000 patients annually, even though its effects can be transient and patients can experience significant side effects such as memory loss.and another, (which I certainly do not agree with...)
Cortical stimulation is much less invasive than deep brain stimulation treatments currently being studied.Read here.