What people believe
The name "attention deficit" implies a shortage of attention — as if people with ADHD simply have less of it than everyone else. This leads to the assumption that people with ADHD cannot focus on anything, which in turn leads to the dismissive response when someone with ADHD demonstrates intense focus: "You can't have ADHD — look how long you spent on that project."
What the evidence says
ADHD is not an attention deficit. It is an attention regulation deficit. The issue is not the total amount of attention available but the brain's inability to allocate attention based on priority, importance, or obligation. The ADHD brain allocates attention based on interest, novelty, challenge, and urgency — what has been described as the interest-based nervous system.1
Hyperfocus — the state of intense, sustained concentration on a single activity, often for hours, to the exclusion of everything else — is widely reported by people with ADHD. While hyperfocus is not yet a formally defined clinical construct, it is increasingly recognised in the research literature as a consistent feature of the ADHD experience. The 2025 World Psychiatry review by Cortese and colleagues notes that ADHD involves dysregulation of the dopamine-mediated reward and motivation system, which explains both the inability to sustain attention on low-reward tasks and the excessive focus on high-reward activities.2
The prefrontal cortex operates on an inverted-U dopamine curve. Tasks that generate their own dopamine — through novelty, inherent interest, or perceived urgency — push the system toward the top of the curve, enabling sustained performance. Tasks that are familiar, mandatory, or distant in reward leave the system at the bottom of the curve, where attention is fragmented and initiation is difficult.3 The person who cannot start their report but can spend five hours reorganising their music library is not choosing to ignore the report. Their brain is allocating activation resources based on neurochemistry, and the report does not generate sufficient dopamine to sustain prefrontal engagement.
What to do instead
Understand that ADHD involves too much attention in some contexts and too little in others — the problem is regulation, not capacity. Hyperfocus is not evidence against ADHD; it is evidence of the same underlying dysregulation. If you have ADHD, learning to recognise when hyperfocus is serving you (deep work on a meaningful project) versus when it is hijacking your priorities (three hours on a tangential interest while a deadline passes) is a core management skill. External interruption systems — timers, alarms, scheduled check-ins — can break hyperfocus when it has overstayed its usefulness.