How do reward circuits function differently in ADHD?

In ADHD, reward circuits respond strongly to novelty but lose responsiveness quickly once something becomes predictable. This is why rewards, systems, or routines often work briefly and then stop motivating. The brain adapts fast, and the dopamine boost fades. Clinicians explain that this doesn’t mean rewards are useless. It means they need to be immediate, varied, and meaningful. Long term or delayed rewards often don’t activate motivation reliably. Novelty matters because it temporarily increases dopamine. Understanding this helps people stop blaming themselves when systems stop working and instead redesign them more flexibly.