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There are twelve unique nerves that sprout from the brain, exit the skull into the face, and mediate smell, sight, hearing, taste. These are called cranial nerves, and the tenth one is nicknamed the “wandering nerve” because it’s the only one out of the twelve that ventures well beyond your face and around your heart and lungs. After its exit from a tiny hole in the base of the skull, it descends in the neck tucked between the carotid artery and jugular vein. If you were to slice it and look at its cut end head-on, you’d see fibers called efferents, because they carry outbound signals to your chest cavity. These are half of the nerve fibers that your brain uses to control your heart rate in times of stress or rest; specifically, these are the fibers which are activated in rest. They are also, unsurprisingly, the pathway that Buddhist monks and others, through years of training, use to lower their heart rate with thought alone. Less well known is that the wandering nerve is a two-way street. It also carries signals (via afferent fibers) back into the skull from your heart and lungs to shower the brain with ascending information signaling the brain to enter a more calm and restful state. And these fibers can be manipulated or even hijacked. How? You can do it yourself through the intense practice of mindful breathing. Meditative breathing can calm the electrical oscillations and stress responses in your mind by resetting your vagal tone. The neuroscience term is “network reset.” So, despite the increasing popularity of inserting catheters and wires into brains, the basic ability to modify your thoughts and feelings is actually already a built-in technology in each of us. I’m not saying that mindful, meditative breathing alone would have necessarily relieved Raymond’s compulsive use of eyedrops; certainly, it would not have helped Nathan Copeland regain feeling in his fingers. But I do say this: never underestimate the power of the human brain.
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Rahul Jandial (Life Lessons From A Brain Surgeon: Practical Strategies for Peak Health and Performance)