Deep-brain stimulation involves implanting electrodes into patients' brains. The electrodes are connected to an impulse generator - usually implanted below the collarbone - and deliver continuous, high-frequency, short electrical impulses aimed at 'resetting' brain circuitry. Jens Kuhn, from the University of Cologne and Theo P.J. Gruender from the Max Planck Institute reviewed studies into the effectiveness of deep-brain stimulation published between 1980 and 2009. They found improvement rates of between 35-70% in treatment resistant OCD (obsessive-compulsive disorder), depression and Tourette's syndrome with a low rate of side effects.
You can find out more about this research at