The neurosurgeon and neuroscience researcher Kevin J. Tracy, MD is one of the foremost experts on the vagus nerve. He and his laboratory are the discoverers of landmark findings about the vagus that we now take for granted. His book The Great Nerve, written for the lay public, is an excellent introduction to the amazing scope and clinical significance of vagal function.

For a the most extensively researched and validated vagal stimulation device, see Truvaga.