Quote from : What's Behind Your Belly Button? A Psychological Perspective of the Intelligence of Human Nature and Gut Instinct Book

The combination of the Main brain with its central nervous system, and the ancient Animal Brain with its somatic, enteric nervous system in the inner body—in the gut—and the constant dialog between them provides a self-correcting feedback system, which regulates the behavioral qualities of the organism when consciously cultivated—preferably in early youth.