A switch nobody can find, and the two things that trip it anyway
Alex Bowen and Chiara Horlin, at the University of Glasgow, have published a qualitative study in Neurodiversity that does something the hyperfocus literature has mostly avoided: it asks ADHD adults what the state is actually like, and then tests the answer against flow theory. Seven UK adults, aged 21 to 58, interviewed at length; a hybrid analysis that let the participants’ accounts speak first and then held them up against Csikszentmihalyi’s eight elements of flow. The design matters because hyperfocus has been defined until now almost entirely from clinician reports — and the participants’ account differs from the clinicians’ in ways that turn out to be the whole story.
Start with the finding every participant shared: they could not switch it on. Aaron called hyperfocus “how I got through a Maths degree” and, in the same breath, said it “would be a great thing if you had some kind of control over it, but I don’t.” Ciara found this frustrating; Ellen said her hyperfocus came “from a place of desperation.” They knew what tended to trigger it, and they tried — Delta with coffee as a reward, Greg by deliberately starting a task he associated with hyperfocus under deadline and hoping. Sometimes it came. Sometimes it didn’t. Nobody could make it.
Two things reliably tripped it, and both are exactly what monotropism would predict. The first is interest — total, non-negotiable, and not transferable: “I wish I could hyperfocus on boring things,” Ellen said. “I can’t.” Barbie added the calibration: if a task is too easy or too difficult, there is no interest, and without interest there is nothing. The second is time pressure — an urgent job at work, an exam after a sleepless night of procrastination, the deadline that Ciara summarised as the ADHD cliché that turns out to be true: two weeks of work in a day, then no work for two weeks. Interest supplies the pull; urgency supplies the ignition. Neither is under the person’s command.
There is a third trigger the paper surfaces that deserves more attention than it gets: learning. Every participant described a self-reinforcing loop in which interest prompts learning, learning builds skill, skill deepens interest, and the tunnel goes further in — Barbie’s Latin on Duolingo, then a book, then YouTube. Freda’s line is the sharp one: “if you never do something, it can’t become a hyperfocus.” The state runs on engagement it has already accumulated. That is why it looks like talent from the outside and feels like appetite from within.
Inside the tunnel, where time and self collapse into the task
Once inside, the defining feature is a collapse of time-awareness and self-awareness into a single absorbed state. Freda: “You think you’re gonna be five minutes, and it’s been three hours.” Ellen: “It’s like I’m in a bubble.” Ciara described an “extreme mental filter.” And Barbie gave the account that separates hyperfocus from mindful absorption of any kind: “when I’m in hyperfocus, I’m not thinking, ‘oh, I’m in hyperfocus’ — there’s no room for other thought.” Self-awareness returns only afterwards. You know you were there once you have left.
The intensity is compulsive and it escalates. Barbie called it “excited,” fast, with “no pace to it” — “always a sense of wanting to do more and more.” Delta reached for comparisons that flag the risk plainly: it was like eating chocolate, or having alcohol. Duration ran from Greg’s three-to-five hours at the outside, to Freda’s account of three days watching a television series roughly twenty hours a day, going to bed at ten in the morning after passing out, taking the laptop to the bathroom, ordering food and eating it with the laptop still in hand — “I felt stuck. There was nothing else I could do.”
Here is the paradox the paper isolates and that no clinician-derived definition had noticed: inside the tunnel, control is absolute; at its edges, control is nil. Greg put it exactly — “in hyperfocus there is control over the task that you’re doing, but not other things.” Aaron went further: task-control ran directly against his anxiety and self-doubt, gave him something his ordinary functioning rarely did. So the state that participants could neither enter nor exit at will was, once inside, the one place they felt fully in command. That is not a contradiction. It is what a system optimised for depth rather than breadth feels like from the inside — the same monotropic architecture that produces autistic special interests, arriving in ADHD adults as an experience they cannot summon and cannot escape but can, while it lasts, entirely inhabit.
Sensory input goes with the rest. Aaron said all the sensory “stuff that normally stops things” was blanked; Greg described not noticing screen glare or sunlight until it had built into “increasing sensory overload, because something’s been bugging me and I haven’t been doing anything about it.” What returns after the tunnel is not just self-awareness. It is everything the tunnel excluded, all at once.
The hangover that arrives when the tunnel lets go
The authors call the aftermath the hyperfocus hangover, and its three registers deserve stating plainly, because they are the cost the environment mostly refuses to price. Physically: participants forgot to eat, drink, move, sleep, or use the toilet. Two reported urinary infections as a direct result. Ellen went cold in the bath while absorbed in a book; Barbie developed eye strain and shoulder ache from not moving; Delta stayed awake forty hours and described forgetting to eat to the point of considering himself mildly anorexic. Physical discomfort was, for some, the only exit signal that worked — and the threshold at which it registered varied enormously.
Socially: hyperfocus was solitary for everyone, and being interrupted was not neutral. Greg found it “very uncomfortable” and frustrating that a colleague “might not understand why I’m not reacting”; Ciara had “dropped the ball on friendships” while caught in it, and counted herself lucky to live with neurodivergent people who understood. Psychologically: Barbie experienced “pure rage” at forced exits; Ellen felt guilt afterwards for what hyperfocus had displaced; and several described an eerie inner split — Delta’s tug-of-war between intention and attention (“Let’s try not to forget the work.” “Oh. The work’s now forgotten mate!”), Freda’s “my brain has decided to focus on this very small part of the thing I enjoy and not let me do anything else.” Ciara called the feeling “disconcerting, eerie, other.”
Then the flood. Because the tunnel excludes so much, exiting it means everything excluded returns at once — sensory input, bodily signal, social obligation, the deadlines the tunnel wasn’t pointed at. Participants described this as a period of overwhelm and depleted capacity in which they could not easily communicate their own needs. This is the piece of the account most worth carrying out of the paper, because it changes what help looks like: hyperfocus does not end when the task ends. It ends when the recovery ends. And an environment that treats the exit as the finish line — that expects the person to be immediately available, responsive, and organised the moment the tunnel closes — is charging them for the recovery phase without acknowledging that it exists.
The line to the autistic burnout piece from a fortnight ago runs directly here. That was a system withdrawing when demand exceeded supply; this is a system committing when interest exceeds everything else. Both end in a recovery the world hasn’t budgeted for, and both are read as pathology precisely because the recovery is invisible from outside.
Why it isn't flow — and what monotropism explains that flow cannot
The paper’s second aim was to test hyperfocus against flow, and the answer is clean: they share features but they are not the same state, and the differences are diagnostic. Flow has preconditions — a balance of skill and challenge, clear goals, immediate feedback. Hyperfocus needs none of them; where those features appear, they generate interest, and interest does the work. Flow is characterised by a sense of control; hyperfocus splits control in two — task mastery inside, none over the state itself. Flow is intrinsically rewarding; hyperfocus ran on intrinsic and extrinsic motivation together, with time pressure and desperation as common ignition. Flow is uniformly positive; hyperfocus produced urinary infections and forty-hour vigils. Flow is entered voluntarily and left cleanly; hyperfocus was neither.
What survives the comparison is the observation that flow theory was built from neurotypical experience — a state chosen, regulated and enjoyed — and that hyperfocus is what interest-gated attention looks like when the gate is not under conscious control. Monotropism accounts for every one of the divergences without strain: attention that concentrates intensely on few interests rather than distributing across many will find its way in through interest alone, will lock the field to the task, will exclude the body and the clock, and will exact a cost on exit proportional to how completely it excluded them. The authors note that monotropism scores run higher in both ADHD and autistic people; hyperfocus may be one shared attentional signature under two labels.
The participants themselves supplied the ethical frame, and it is the corpus’s own: three of them explicitly rejected the idea of ADHD as a superpower and chose to talk about the difficulty. Hyperfocus is not the gift and it is not the disorder. It is the shape interest takes in an attention system built for depth — a maths degree when the interest and the deadline align, three lost days when they don’t, and a recovery either way that the person owes to a body and a life the tunnel excluded. Whether that shape reads as strength or as harm is not decided by the trait. It is decided by duration, by whether the exit is honoured, and by whether the surrounding world can hold a mind that goes all-in. The clinical definitions never captured this because they were written from outside the tunnel. The people who live inside it always knew.
Citations
Bowen, A. & Horlin, C. (2026) — Absorbed, Trapped, or Lost? A Qualitative Investigation of Hyperfocus Experiences in ADHD Adults — Neurodiversity
Murray, D., Lesser, M. & Lawson, W. (2005) — Attention, monotropism and the diagnostic criteria for autism — Autism
Hupfeld, K. E., Abagis, T. R. & Shah, P. (2019) — Living “in the zone”: Hyperfocus in adult ADHD — ADHD Attention Deficit and Hyperactivity Disorders
Dwyer, P., Williams, Z. J., Lawson, W. B. & Rivera, S. M. (2024) — A trans-diagnostic investigation of attention, hyper-focus, and monotropism in autism, attention dysregulation hyperactivity development, and the general population — Neurodiversity
Heasman, B., Williams, G., Charura, D. et al. (2024) — Towards autistic flow theory: A non-pathologising conceptual approach — Journal for the Theory of Social Behaviour
