Our unconscious brain is designed to manage all of our bodily systems based on our location in the environment. When we remove one system to work with it (such as the nervous system, or one nerve) in order to induce a change, we are no longer operating within a holistic paradigm where all systems function together autonomically. Altering the nerve from the outside may cause a shift, but since the unconscious mind did not create it, it cannot recreate it. The nervous system’s perception of danger in the environment didn’t actually transform, it just got overruled. Our body knows how to find homeostasis based on where we are, not how we feel.