Executive function and emotion regulation research favours ADHD over autism
A systematic review published in Neuroscience and Biobehavioral Reviews this January examined twenty-two studies on the relationship between executive function and emotion regulation across autism, ADHD, and AuDHD. The distribution tells you everything: sixteen studies on ADHD, four on autism, two on the AuDHD population.
That imbalance is not accidental. We have spent a decade building rigorous evidence for the executive function–emotion regulation link in ADHD while leaving autism largely unexplored. The AuDHD population — the fastest-growing diagnostic group and increasingly recognised as a distinct presentation — received two studies. Two.
The review, conducted by researchers at the University of Santiago de Compostela, searched four databases for empirical articles published between January 2013 and October 2024. The date range reflects post-DSM-5 diagnostic criteria. The findings reveal not just what we know about executive function and emotion regulation, but what we have chosen to investigate — and, therefore, what we have chosen to ignore. This matters because executive function and emotion regulation have been proposed as transdiagnostic mechanisms: shared processes that underlie difficulties across diagnostic categories. If these mechanisms operate similarly across autism and ADHD, the diagnostic distinction becomes administrative rather than functional. But we cannot know whether they operate similarly if we only study one condition.
Executive dysfunction predicts emotional dysregulation in ADHD
The ADHD literature is unambiguous. Across twelve studies in children and three in adults, executive function difficulties predict emotional dysregulation. The mechanism is straightforward: inhibitory control enables you to suppress immediate emotional reactions; cognitive flexibility enables you to shift perspective and adapt; working memory enables you to recall and apply coping strategies. Impair any of these, and emotion regulation suffers.
The review found significant associations between inhibitory control deficits and emotional impulsivity. Difficulties in cognitive flexibility correlated with heightened frustration and interpersonal conflict, particularly in children. Working memory impairments related to difficulties implementing previously learned regulation strategies.
Four ADHD studies found no significant relationship — but three of these focused specifically on working memory using performance-based tasks, and one used irritability as a proxy for emotion regulation in adolescents. The null findings appear to reflect methodological limitations rather than genuine absence of association.
The broader pattern is consistent: executive dysfunction and emotional dysregulation are tightly linked in ADHD across developmental stages. This is established science. The question is whether the same relationship holds in autism. But we do not have the evidence to answer it.
Autism executive function research fails on methodology
Four studies examined executive function and emotion regulation in autism. Two found significant associations; two found none. The split maps precisely onto methodology: informant-reported measures (parents, therapists) consistently showed the relationship; performance-based tasks consistently did not. This is not a contradiction. It is a measurement problem.
Performance-based executive function tasks were designed for neurotypical cognition. They rely on verbal instructions, artificial testing conditions, and structured environments that may actually reduce neurodivergent executive difficulties rather than reveal them. The Day/Night task — used in two of the null-finding studies — requires verbal responses, meaning observed difficulties may reflect language processing challenges rather than inhibitory control deficits.
Informant-based assessments capture real-world functioning. Parents observe executive difficulties as they manifest in daily life — not under optimised laboratory conditions. The review authors note that performance-based tasks, conducted under structured conditions, may enable neurodivergent individuals to perform optimally, thereby reducing ecological validity.
The autism studies also concentrated on preschool-aged children, a developmental period when emotion regulation mechanisms are still maturing. Only one study examined autistic adults — and that study, using informant reports, found significant positive association between executive dysfunction and emotional dysregulation.
The evidence is not absent. The methodology is inadequate.
Transdiagnostic mechanisms across ADHD and autism challenge diagnostic categories
Prior to DSM-5, clinicians could not diagnose autism and ADHD simultaneously. The diagnostic framework treated them as mutually exclusive. DSM-5 permitted co-occurring diagnosis in 2013, but research infrastructure has not caught up. Two studies in over a decade is not a knowledge gap — it is a structural failure to investigate the AuDHD population that most directly tests whether autism and ADHD are distinct conditions or overlapping presentations of shared mechanisms.
Both AuDHD studies in this review found that cognitive inflexibility related to emotional dysregulation. But with sample sizes this small and methodology this limited, the findings are suggestive rather than conclusive.
The transdiagnostic framing is the critical move. If executive function and emotion regulation operate as shared mechanisms across autism and ADHD, then functional outcomes depend on EF–ER profiles rather than diagnostic category. The diagnostic label tells you which administrative box someone occupies. The EF–ER profile tells you what difficulties they actually face.
This aligns with emerging evidence that diagnostic categories do not predict function. An Italian study published earlier this year found no significant differences between autism and ADHD groups on theory of mind, pragmatic language, inattention, impulsivity, social skills, or behavioural problems. Latent profile analysis identified four functional profiles cutting across diagnostic boundaries — with 50% of both autism and ADHD participants clustering into the same profile.
The diagnostic distinction is administrative. The functional mechanisms are transdiagnostic. We have spent a decade building evidence for one condition while largely ignoring the other — and almost entirely ignoring the AuDHD overlap that would test whether the distinction matters at all.
Citations
Pozo-Rodríguez, M., Cruz, S., Conde-Pumpido-Zubizarreta, S., Carracedo, A., Tubío-Fungueiriño, M., & Fernández-Prieto, M. (2026) — A systematic review on the association between executive function and emotional regulation in autism, ADHD, and autism/ADHD
