Each page here takes one study, or one idea and the studies that tested it, and sets out
what was found, what it can’t tell you, and where we rely on it.
Foundational guide One idea, every study that tested it
Foundational paper: Barkley RA. Behavioral inhibition, sustained attention, and executive functions: constructing a unifying theory of ADHD. Psychological Bulletin 1997;121(1):65–94. doi:10.1037/0033-2909.121.1.65
Executive-function theories changed how ADHD was understood: less as a failure to know what to do, more as difficulty carrying an intention across time. The evidence supports meaningful differences in inhibition, working memory, planning, and shifting at the group level. It does not support one broken “executive system” that explains every person with ADHD.
5 key papers, annotated: Barkley 1997 · Diamond 2013 · Willcutt et al. 2005 · Boonstra et al. 2005 · Mostert et al. 2015.
One proposal, then a decade of tests. Each dot is a paper the guide annotates.
ADHD and autism are distinct diagnoses that often occur in the same person. Family, twin, trait-structure, registry, and health-record studies all support real overlap. They also show meaningful differences. “AuDHD” is useful community language for that intersection, not evidence that the two conditions collapse into one.
5 key papers: Rommelse et al. 2010 · Ghirardi et al. 2019 · Solberg et al. 2019 · Krakowski et al. 2021 · Yerys et al. 2025.
Autistic people and researchers describe burnout as a pattern of exhaustion, reduced functioning, withdrawal, and increased sensory strain after demands outrun support. Depression can overlap with that pattern, follow it, or occur alongside it. The research increasingly treats autistic burnout as a useful construct, but it does not yet provide a clinical test that can separate the two for one person.
5 key papers: Raymaker et al. 2020 · Higgins et al. 2021 · Mantzalas et al. 2022 · Arnold et al. 2023 · Bougoure et al. 2026.
In 2012 an autistic sociologist proposed that the misunderstanding between autistic and non-autistic people runs both ways. A decade of experiments has tested it. Here’s what held, what shifted, and what nobody has measured yet.
11 key papers: Milton 2012 · Sheppard et al. 2016 · Edey et al. 2016 · Sasson et al. 2017 · Heasman and Gillespie 2018 · Crompton et al. 2020 · Crompton et al. 2020 · Morrison et al. 2020 · Mitchell et al. 2021 · Davis and Crompton 2021 · Milton et al. 2022.
Rommelse NNJ, Franke B, Geurts HM, Hartman CA, Buitelaar JK. Shared heritability of attention-deficit/hyperactivity disorder and autism spectrum disorder. European Child & Adolescent Psychiatry 2010;19:281–295. doi:10.1007/s00787-010-0092-xOpen full text
A 2010 review pulled together the first family and twin evidence that ADHD and autistic traits share some inherited influences. The signal was meaningful. The molecular evidence was not yet ready to name the genes or explain any one person.
Design
Narrative review of family
Sample
Multiple studies; key twin samples included 6,771 children and 674 young adults
Where
International literature reviewed by a Netherlands-based research team
Beheshti A, Chavanon ML, Christiansen H. Emotion dysregulation in adults with attention deficit hyperactivity disorder: a meta-analysis. BMC Psychiatry 2020;20:120. doi:10.1186/s12888-020-2442-7Open full text
A 2020 meta-analysis found a large difference in emotion dysregulation between adults with ADHD and adults without it. The result is persuasive that the connection is real. It is less precise about why the connection exists or how it differs from one person to another.
Design
Systematic review and random-effects meta-analysis of case-control studies
Sample
13 studies; 2,535 adults across ADHD and comparison groups
Rowney-Smith A, Sutton B, Quadt L, Eccles JA. The lived experience of rejection sensitivity in ADHD - A qualitative exploration. PLOS One 2026;21(1):e0314669. doi:10.1371/journal.pone.0314669Open full text
A 2026 focus-group study asked five university students with ADHD to describe rejection sensitivity in their own words. They talked about withdrawing before rejection could happen, masking how much it hurt, and feeling the response in their bodies. The study opens a useful line of inquiry. It is far too small to establish a universal ADHD pattern or a separate diagnosis.
Design
Qualitative thematic analysis of two online focus groups
Sample
5 undergraduate students over 18 with formal ADHD diagnoses
Raymaker DM, Teo AR, Steckler NA, Lentz B, Scharer M, Delos Santos A, Kapp SK, Hunter M, Joyce A, Nicolaidis C. “Having all of your internal resources exhausted beyond measure and being left with no clean-up crew”: Defining autistic burnout. Autism in Adulthood 2020;2(2):132–143. doi:10.1089/aut.2019.0079
Autistic adults had been describing burnout to each other for years before research caught up. In 2020, a team built partly of autistic researchers wrote the first definition from those accounts.
Design
Qualitative
Sample
19 interviews with autistic adults (10 women, 7 men, 4 another gender, aged 21 to 65) and 19 public online sources
Maciver D, Singh Roy A, Johnston L, Boilson M, Curnow E, Johnstone-Cooke V, Rutherford M. Waiting Times and Influencing Factors in Children and Adults Undergoing Assessment for Autism, ADHD, and Other Neurodevelopmental Differences. Autism Research 2025;18(4):788–801. doi:10.1002/aur.70011
A team funded by the Scottish Government pulled the case notes of 408 completed neurodevelopmental assessments and timed every stage. The median wait was 252 days for adults and 525 for children, and adults being assessed for ADHD waited longest.
Design
Retrospective review of clinical case notes
Sample
408 completed assessments (206 children and adolescents, 202 adults) from 30 diagnosing teams
Shaw P, Stringaris A, Nigg J, Leibenluft E. Emotion dysregulation in attention deficit hyperactivity disorder. American Journal of Psychiatry 2014;171(3):276–293. doi:10.1176/appi.ajp.2013.13070966
In 2014, four researchers pulled together everything the literature had on ADHD and emotion. Their answer to the question was: it’s common, it does real damage, and the field can’t yet say what the relationship is.
Design
Narrative review with three meta-analyses
Sample
Dozens of studies, mostly of children; adult data from clinic samples
Hull L, Petrides KV, Allison C, Smith P, Baron-Cohen S, Lai MC, Mandy W. “Putting on My Best Normal”: Social Camouflaging in Adults with Autism Spectrum Conditions. Journal of Autism and Developmental Disorders 2017;47(8):2519–2534. doi:10.1007/s10803-017-3166-5
In 2017, ninety-two autistic adults described, in their own words, why they hide their autistic traits, how they do it, and what it costs them. The paper gave the field its working model of camouflaging.
Design
Qualitative
Sample
92 autistic adults (55 women, 30 men, 7 another gender), aged 18 to 79
Kapp SK, Steward R, Crane L, Elliott D, Elphick C, Pellicano E, Russell G. “People should be allowed to do what they like”: Autistic adults’ views and experiences of stimming. Autism 2019;23(7):1782–1792. doi:10.1177/1362361319829628
Diagnostic manuals list “stereotyped or repetitive motor movements” as a core feature of autism. In 2019, a team that included autistic researchers asked 31 autistic adults what stimming is for. The answer was consistent: it regulates.
Design
Qualitative
Sample
31 autistic adults (20 men, 10 women, 1 non-binary), aged 21 to 56; 19 interviewed, 12 in focus groups
Au-Yeung SK, Freeth M, Thompson AR. “Am I gonna regret this?”: The experiences of diagnostic disclosure in autistic adults. Autism 2025;29(8):2181–2192. doi:10.1177/13623613251337504
Twelve adults diagnosed autistic in adulthood talked, at length, about telling other people. A 2025 study from Sheffield followed what happened next: why they told, how it landed, and what it changed.
Design
Qualitative
Sample
12 autistic adults diagnosed in adulthood (6 women, 4 men, 2 non-binary), aged 20 to over 60
