Stimulation reduces seizures by giving frequent, modest electrical energy pulses to the brain through the vagus nerve. It is sometimes referred to as a "brain pacemaker." In the chest, a stimulator device is inserted beneath the skin. The device's wire is wrapped around the vagus nerve in the neck. The spinal cord stimulator masks pain impulses before they reach the brain. Electric pulses are delivered to electrodes placed across the spinal cord via a stimulator device. The pain signals are either not detected or are replaced by a tingling sensation as a result of the pulses.