Attention deficit hyperactivity disorder
neurodevelopmental disorder
Attention deficit hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterised by symptoms of inattention, hyperactivity, impulsivity, and emotional dysregulation that are excessive and pervasive, impairing in multiple contexts, and developmentally inappropriate. ADHD symptoms arise from executive dysfunction.
Impairments resulting from deficits in self-regulation such as time management, cognitive inhibition, task initiation, and sustained attention can include poor professional performance, relationship difficulties, and numerous health risks, collectively predisposing to a diminished quality of life and a reduction in life expectancy. It is associated with other mental disorders as well as non-psychiatric disorders, which can cause additional impairment.
While ADHD involves a lack of sustained attention to tasks, inhibitory deficits also can lead to difficulty interrupting an ongoing response pattern, manifesting in the perseveration of actions despite a change in context whereby the individual intends the termination of those actions. This symptom is known colloquially as hyperfocus and is related to risks such as addiction and types of offending behaviour. ADHD can be difficult to tell apart from other conditions. ADHD represents the extreme lower end of the continuous dimensional trait (bell curve) of executive functioning and self-regulation, which is supported by twin, brain imaging and molecular genetic studies. ADHD treatment is most effective when medications (primarily stimulants like methylphenidate or amphetamines, as well as non-stimulants such as atomoxetine or alpha-2 agonists) are used, often in combination with psychotherapy; exercise and dietary modifications have no proven benefit.
The precise causes of ADHD are unknown in most individual cases.
“Attention deficit hyperactivity disorder” enters the record as neurodevelopmental disorder. Crown Archives preserves that source wording while asking what Attention, deficit and hyperactivity can confirm, complicate or overturn.
Why this record matters
“Attention deficit hyperactivity disorder” is worth following because a concise public description often conceals a longer documentary argument. Here, Attention, deficit and hyperactivity provides the most credible route into that argument.
The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Sep 22, 2026. The linked authority identifier is Q181923. The Library of Congress control number is sh85063661. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank.
Overview language is designed for orientation and should not be treated as a substitute for the evidence cited beneath it. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.
- Subject orientation
- Search vocabulary
- Locating named sources
The closest primary source, responsible institution and strongest cited specialist reference.
Three-step research path
- Establish the record: confirm the title “Attention deficit hyperactivity disorder”, its source revision and the description used here.
- Expand the search: follow Attention deficit hyperactivity disorder primary sources, Attention deficit hyperactivity disorder archive and Attention research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “Attention deficit hyperactivity disorder”?
- What terminology or title could unlock a more precise catalogue search?
- Which institution is responsible for the underlying evidence?
Search terms from this dossier
This entry incorporates text from “Attention deficit hyperactivity disorder” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.