Vagus nerve stimulation (VNS). Stimulation in the vagus nerve is a way of regulating the excitability of nerve cells without having inducing seizures. The vagus nerve, which begins inside the brainstem, has numerous branches, and vagal nerve stimulation is used medically to normalize heart rate in people with cardiac arrhythmias. https://brainhealthusa.com/psychiatrist-in-arcadia-los-angeles-county/