Dopamine regulates the activation of the default mode network and task networks to be out of phase.

“What dopamine is doing in this context is dopamine is acting like a conductor. Dopamine is saying this circuit should be active then that circuit should be active. It should be default mode network and then when the default mode network is not active, then it should be the task network. So it's really acting as a conductor saying, you go, now you go, now you go, now you go. And in ADHD, there's something about the dopamine system that is not allowing it to conduct these networks and make sure that they stay what, the engineers or physicists or mathematicians would say out of phase to be anti-correlated, okay?”