Vagus Nerve Therapy is a therapy that sends electric signals to the brain. A small device is implanted into the body through the left side of the chest. The device is called a vagus nerve stimulator. It also is known as a pulse generator. It produces repeating, low-level pulses of electrical current.
The pulse generator is connected to a wire that attaches to the vagus nerve. The vagus nerve has many paths. One path goes from the neck up to the brain. VNS therapy uses this path to send electric signals to the brain.
There is some evidence that these signals may lower the number of seizures. See more at: http://epilepsy.med.nyu.edu/diagnosis-treatment/vagus-nerve-stimulation-vns#sthash.i6xiXCgm.dpuf