Kay, Dosenbach and colleagues at Washington University (Cell, December 2025) used resting state fMRI from the ABCD study, which images 11,875 children aged 8 to 11 (the press materials cite about 5,800 in the stimulant analysis, 337 of them on stimulants). They validated the pattern in five healthy adults scanned for three hours each, on and off 40 mg of methylphenidate. Stimulant connectivity changes matched the fMRI signature of daytime arousal and of a longer night's sleep. They also appeared in salience and parietal memory networks tied to reward learning. The dorsal attention network did not change.

The finding Aftab leaves out is the sleep result. Stimulants reversed the brain and school grade effects of sleep deprivation. In the WashU account, well rested children without ADHD got no academic benefit.

This is resting state imaging, not imaging during a task. The children were not randomized to medication. "No change in attention networks" is a statement about connectivity at rest, not about attention behavior. The line about stimulants "tricking the brain into assigning greater worth" to homework is Aftab's interpretation of the data, a reasonable one, and not something the study measured.

Sonuga-Barke, Taylor, Sembi and Smith (J Child Psychol Psychiatry, 1992) ran two experiments. Hyperactive and control children earned points equally well under most conditions. The hyperactive group showed a "maladaptive preference for the small reward" only when the session length was a fixed number of trials, so that faster choices shortened it. The authors concluded the children cared more about reducing total delay than about the size or speed of the reward.

These were small samples of boys, defined by 1990s criteria for hyperactivity. Sonuga-Barke himself later proposed that delay aversion explains only one of several routes to ADHD. Aftab reports this accurately.

Russell Barkley's 1997 review in Psychological Bulletin made behavioral inhibition the primary deficit, with downstream effects on working memory, self regulation of "affect, motivation, arousal," internal speech and planning. He found the evidence strongest for inhibition, working memory, regulation of motivation and motor control. "Time blindness" and emotional impulsivity came later and are popular shorthand for the same model.

The paper's title includes "sustained attention." Barkley did not discard attention. He demoted it to a consequence. Aftab's summary is fair.

Motivation is clearly in the picture, and long before 2025. Volkow and colleagues (Molecular Psychiatry, 2011) used PET in 45 adults with ADHD and 41 controls. They found lower trait motivation in ADHD that tracked with reduced dopamine receptor and transporter availability in the reward pathway. Lower motivation also correlated with more inattention symptoms. Their conclusion was that the motivation deficit "may contribute to attention deficits."

Sustained attention (vigilance over a long, dull task) is a standard laboratory construct, and ADHD groups show deficits on it. Aftab renames that capacity "sustained engagement" and locates its cause in motivation. That reframes the mechanism and leaves attention in the picture. The essay body says this carefully. The headline does not.

Two Swedish national register studies from the Karolinska group used target trial emulation in about 148,600 people aged 6 to 64 with a new ADHD diagnosis. Starting medication within three months was associated with lower two year all cause mortality (JAMA, 2024; hazard ratio 0.79). The difference was 39 versus 48 deaths per 10,000, driven by unnatural causes. The BMJ follow up (2025) found lower rates of first suicidal behavior (incidence rate ratio 0.83), substance misuse (0.85), transport accidents (0.88) and criminality (0.87). Methylphenidate accounted for 88% of starts.

Both studies are observational, from one research group, one country and one set of registers. The absolute mortality difference is about 9 per 10,000 over two years. The authors say they could not fully adjust for severity or genetics. Aftab's wording ("associated with") is correct.

Taxometric analysis of ADHD symptoms in a large NICHD child cohort (Marcus and Barry, J Abnorm Psychol, 2011) found a dimensional structure. ADHD looks like the far end of a continuum rather than a separate category. In a preregistered online foraging game at Penn (Barack and colleagues, Proc R Soc B, 2024), people who screened positive for ADHD traits left depleting patches sooner and earned higher reward rates. The authors suggest the trait may be an advantage in some environments.

An older finding cuts the other way, and the essay skips it. In 1978 Judith Rapoport's NIMH group gave a single dose of dextroamphetamine to 14 boys without ADHD. They showed less motor activity and better scores on cognitive tests. The authors concluded that the stimulant response is not specific to the disorder. A good response to the drug does not prove the diagnosis.

Aftab asserts the interaction model without citing evidence for it. The foraging study used a self reported screening scale, not clinical diagnosis. The Channel 4 documentary he answers, presented by the NHS psychiatrist Max Pemberton, drew complaints to Ofcom from ADHD UK.