<qa>  What is the name of a small electrical unit called?DBS is a surgical procedure that seeks to change the brains electrical signalling by means of applied electrical current. To this end, a wire with tiny stimulating electrodes is implanted into one or both sides of the brain. An electrode is a small piece of metal used to take an electric current to or from a power source. These electrodes are connected under the skin on the scalp to a small electrical unit called an INS implantable neurostimulator, which is similar to a heart pacemaker. The device sends out electrical impulses that appear to change the normal flow of electricity in the brain. 