Scientists have discovered that the brain has a triple network linked to the mind —— that is to say, feelings and moods. For example, when we are well, our feelings manifest themselves and turn on the "motivation switch" that prioritizes one of these networks. Conversely, these networks are also involved in the fact that pushing our bodies too hard when we feel fatigued can be a cause of psychological problems. The mechanisms linking the brain, the body, and the mind are gradually being uncovered.