ADHD — and why it separates from autism

An explicit gene-grounded ADHD substrate (gain and arousal axes, intact wiring) restores to health under a stimulant where the same stimulant only partly reaches autism; the theta-cap is redundant for ADHD but essential for autism's wiring, and on an AuDHD substrate the two compose. The ADHD model's validity is open. efficacy=0.

Earlier work read ADHD only as a relabelled autism cohort; here it gets its own explicit, gene-grounded substrate. Eight ADHD genes — six on the output/gain axis, two on the arousal/threshold axis, with wiring intact as the discriminant — are emerged on the same read-only engine and run side-by-side with the autism cohort. Three results follow: the stimulant is for the gain axis (it fully restores ADHD, only partly autism), the cap is for the wiring axis (its long-range benefit is over three times larger where wiring is broken), and on an explicit AuDHD substrate the two compose without interference. This is the engine’s account of why severe ADHD can look like autism, and why it is not the same fault. efficacy = 0; the ADHD model’s own validity is open.

An explicit ADHD substrate, not a relabelled cohort

The discriminating claim — that ADHD shares autism’s gain/arousal surface but has intact wiring — only means something if the ADHD substrate is built from ADHD genes, not borrowed. Eight are used, each read through the same SantaLucia γ pipeline (four fetched live from NCBI RefSeq). The output/gain (O) axis carries the catecholamine machinery: DRD4 (the 7-repeat ADHD locus), SLC6A3 (the dopamine transporter), COMT, DBH, TH (synthesis and catabolism), and SNAP25 (presynaptic release). The arousal/threshold (T) axis carries ADRA2A (the guanfacine target) and SLC6A4 (serotonergic tone). Critically, W = none: there is no wiring lever, and the axis-ambiguous or syndromic candidates (ADGRL3, FOXP2) are pre-registered excluded so that “ADHD has intact wiring” is airtight rather than assumed. The per-axis gain factors are inherited byte-for-byte from the autism work — no new tuned constant.

The stimulant is for the gain axis

Side-by-side, the asymmetry is sharp. ADHD baseline synchrony (R = 0.362) sits closer to health than autism’s wiring-faulted 0.322. On the intact ADHD geometry the stimulant (raising catecholamine gain) restores ADHD to health in both synchrony and θ–γ coupling at a finite dose. On the broken autism geometry the same stimulant restores the θ–γ coupling (the gain axis) but synchrony stays capped below health and the locality stays at the broken value — gain never touches the wiring. This reproduces the §19 result on an explicit ADHD substrate: a gain operator completes a gain fault and only masks a wiring fault.

The cap is for the wiring axis

The complementary test is the cap. Its long-range (far-pair) benefit is 3.3× larger where the wiring is broken (autism Δfar 0.136) than where it is intact (ADHD 0.041). On stimulant-restored states the cap still adds long-range routing to autism but little to ADHD — once the gain is restored, the ADHD highway is already intact, so the cap is redundant. The two operators are axis-appropriate mirror images: the stimulant fixes the gain axis ADHD owns, the cap fixes the wiring axis only autism has.

They compose: the AuDHD substrate

The combination is tested where it should matter most: an explicit AuDHD cohort built from ADHD’s gain/arousal genes and autism’s wiring genes — a gain deficit on broken geometry. There the stimulant fixes the gain axis (θ–γ coupling to health) and the cap fixes the routing axis (far-coherence 0.213); together they cover both, exceeding either alone, while synchrony (0.393) stays below the over-sync edge. Different axes, no interference. This is the model’s account of two clinical facts at once: why severe ADHD can look like autism (they share the gain/arousal surface, so on that readout they blur), and why they are nonetheless different faults (autism carries gain/arousal plus wiring; ADHD carries gain/arousal alone).

What is owed

The honest debt is stated plainly: the engine has no separately-validated ADHD model. This chapter is a principled, gene-grounded interpretation — catecholamine genes onto the gain axis, intact wiring as the discriminant — that is internally tested and bit-reproducible, but whose mapping to clinical ADHD is held [O]. The stimulant here is the mechanism by which the catecholaminergic class acts, not a claim that any medication treats either condition. Every fraction and coupling value here is an in-silico coupling state, not a clinical response rate or a dose; efficacy = 0 throughout. This is a mechanism-level result about the fault structure of autism as represented in the VP framework — not medical advice, a diagnosis, a treatment protocol, or a cure.