Peer-reviewed neuroscience, rendered as experience.
Every visual is traceable to a real paper.
The Default Mode Network is active when you're daydreaming or mind-wandering. The Task Positive Network is active when you're focusing on something. In most brains, when one switches on, the other switches off. Like a seesaw — one up, one down.
When someone with ADHD tries to focus, the TPN activates — but less strongly than it should. At the same time, the DMN doesn't quiet down like it's supposed to. So you get an underperforming focus network and an overactive daydream network running at the same time. That's what fMRI studies consistently show.
Dopamine helps the brain decide what's worth focusing on. In ADHD, the dopamine reward pathway is underactive. Ordinary tasks don't register as important — the signal is too faint. This is also why hyperfocus happens. When something is genuinely interesting, dopamine spikes, and focus becomes effortless.
Stimulant medication raises dopamine in the prefrontal cortex. This doesn't just quieten the DMN — it restores the anti-phase synchronization between DMN and TPN. The networks start taking turns again properly. The seesaw starts working.