I have read that it is recommended for people with a tendency to depersonalization, to stimulate the vagus nerve. To do this, it serves the Diet Palaeolithic, Conscious Breathing, Meditation, etc
Here a interesting link on this topic : http://www.esencialnatura.com/32-maneras-de-estimular-el-nervio-vago-y-todo-lo-que-necesita-saber-acerca-de-ella/