A key finding was the interaction between two networks, the default mode network (DMN) and the task positive network (TPN). On default mode, when the DMN is in control, the brain falls into daydreaming or stream-of-consciousness thinking. The DMN is activated in even typically-developing brains when a person is between tasks or fatigued. Among children with ADHD, however, the DMN interrupts the brain’s productive TPN. These kids seem less able to turn off their default modes at will, causing them to shift into daydreaming mode. Instead of using his TPN to focus on what he’s doing or plan for what comes next, a child may tune out.
|Saad Faruque via Flickr CC|