Interest, hyperfocus and motivation

Hyperfocus usually means a long spell of intense attention on one activity, with less awareness of time and surroundings. There is no agreed definition: a 2021 review found that most papers on hyperfocus do not define it, and proposed a definition for researchers to test.¹ A 2026 review of 43 publications described hyperfocus as like flow in its intensity and immersion, but often involuntary, without clear goals, and linked with difficulty regulating emotions.²

The measures are few, and all are self-report questionnaires: the Hyperfocusing Scale (2016), the Adult Hyperfocus Questionnaire (2019) and a 12-item version of it (2024).^3,4,5 In two samples of 251 and 372 adults, people with more ADHD traits reported more hyperfocus overall and at school, in hobbies and during screen time.⁴ In a third sample from the same group, scores on the 12-item version correlated with ADHD traits (r = 0.53) and with another hyperfocus scale (r = 0.69), but only weakly with flow (r = 0.12).⁵ Research groups in the Netherlands and Japan also found more hyperfocus where there were more ADHD traits; in the Dutch and German study this held in 1,124 adults from the general population.^6,7

Studies of diagnosed adults disagree. In a Turkish study, adults with ADHD scored higher than university students, whether or not they took stimulant medication.³ In a Dutch and German study, 78 adults with ADHD reported hyperfocus as often, for as long and in as many situations as matched controls, and less often at school or in social settings. In the same study's general-population sample, older and more educated adults reported hyperfocus less often, so comparisons with students may not be like for like.⁶

Hyperfocus may sit alongside attention problems rather than being their opposite. Across 1,220 adults, people who were more distractible in general also reported more hyperfocus.⁸ In 3,500 Japanese adults, hyperfocus scores statistically accounted for part of the link between ADHD traits and problem internet use; all three were measured at one time, so the study cannot show which leads to which.⁷ Adults with ADHD still rate hyperfocus as one of their strengths more often than other adults do.⁹

In a sample of 5,744 children and young people aged 4 to 19, recruited at a science museum, the 131 with a parent- or self-reported autism diagnosis were rated as having attentional strengths much more often than the 346 with ADHD (odds ratio 5.7). The measure, the SWAN scale, rates above-average attention on the items of an ADHD checklist; it is not a hyperfocus questionnaire, and the comparison was with children with ADHD rather than with all children. About four in five of the autistic group were boys, and a third also had ADHD. In the autistic group, these strengths did not go with more impairment or less flexible thinking, but they did go with perseveration and perfectionism.¹¹

In an online study of 492 US adults, self-reported hyperfocus was highest in people who were both autistic and ADHD, then in people with ADHD only, then autistic only, then neither; each group differed from the next. People who identified as autistic or ADHD without a formal diagnosis were included, and people whose scores on an ADHD screening questionnaire did not fit how they identified were left out. Since hyperfocus tracks ADHD traits, the ranking may partly reflect how the groups were formed.¹² A laboratory study by the same group, of 18 autistic and 22 non-autistic adolescents, found more hyperfocus on questionnaires filled in by the teenagers and by their caregivers. A brain-wave measure of hyperfocus and a laboratory attention task showed no group difference, and the different measures generally did not agree with each other. The autistic group was less accurate on visual working memory and distractor tasks, which the authors suggest may reflect difficulty attending to several targets at once. Participants and caregivers on the whole judged hyperfocus's effect as modestly positive, with individual views differing.¹³

In interviews with 24 autistic adults, most of them White, well-educated, employed women, deep immersion in a task was described as joyful and as a time to be themselves. It was also hard to balance against the rest of life, and some described exhaustion and missed self-care.¹⁴

Monotropism was proposed in 2005 by Dinah Murray, Mike Lesser and Wenn Lawson. It holds that an unusual way of allocating attention is central to autism. Drawing on research and on autistic people's accounts, one author's among them, they argued that the social and communication criteria for autism of the time follow from the third criterion, a restricted range of interests.¹⁵

It has been suggested that monotropism describes ADHD as well. The only direct data come from a questionnaire whose items were written by autistic adults: in a preprint study of 1,110 people online (756 autistic), both autism and ADHD went with higher monotropism scores.¹⁶ In another preprint, 111 autistic adults reported more monotropism, hyperfocus and inattention than 39 non-autistic adults. Intense, enjoyable focus and difficulty controlling attention came out as separate dimensions, though each explained little of the variation.¹⁷ A 2026 review of the literature found the most overlap among monotropism, hyperfocus and autistic inertia. It contrasted monotropism's rigid, directed focus with flow, which adapts as a task changes.² Laboratory tests, all from one research group, have not yet backed up the questionnaires. In 46 autistic and 28 non-autistic children aged 2 to 4, an eye-tracking study framed around monotropism found no evidence that the autistic children's attention was "stickier".⁴²

Special interests are central to the theory. In one survey, about two thirds of the autistic adults reported a special interest, more often men than women. Wellbeing did not differ between those with and without one. Among those with one, motivation for the interest went with higher wellbeing, but very intense engagement went with lower wellbeing.¹⁸ In a 2026 online survey of 60 autistic and 122 non-autistic adults, the autistic group said they relied on their interests to manage emotions more, and met more stigma and negative consequences because of them.¹⁹ The entry on special interests covers them in full.

Rewards help people with ADHD on tasks, and they help other people too. A 2005 review of 22 studies of 1,181 children found that reinforcement (rewards, or losing points for errors) improved performance and motivation in children with and without ADHD, with some evidence of a larger effect on performance in ADHD. The same review noted that body measures, such as heart rate, suggested children with ADHD were less responsive to reinforcement, and that the theories of the time did not fit the behavioral findings well.²⁰ A later meta-analysis found that rewards brought inhibitory control in children and adolescents with ADHD up to the level controls showed without rewards, and may improve it more than in controls.²¹

The timing of a reward matters. Pooling 37 comparisons of 3,763 people, those with ADHD more often chose a small reward now over a larger one later, with small to medium effects. In the simpler of the two kinds of task, offering real rather than imagined rewards nearly doubled the difference between people with and without ADHD.²²

Several theories link the reward findings to dopamine. The dual pathway model proposes two routes into ADHD. One runs through difficulties with executive control, tied to circuits between the frontal cortex and the upper (dorsal) striatum. The other runs through an aversion to waiting, tied to reward circuits in the lower (ventral) striatum. Each route is proposed to involve a different branch of the dopamine system.²³

The dopamine transfer deficit theory starts from how dopamine cells usually learn: their firing shifts from a reward to the cues that predict it. The theory proposes that in children with ADHD this shift is weaker, so dopamine cells respond less to cues that signal a coming reward. That would make delayed or occasional rewards less effective, and would account for the preference for quick rewards. Its authors set out predictions for both human and animal research.²⁴

In one laboratory's PET study of 53 unmedicated adults with ADHD and 44 controls, dopamine transporters and D2/D3 receptors were less available in reward regions on the left side of the brain. Lower levels went with more inattention.²⁵ A later analysis of 45 of the same adults with ADHD linked these markers with lower scores on a measure of achievement motivation, a link not seen in controls.²⁶ An independent study of 16 adults with ADHD and 16 controls found no group difference in D2/D3 receptors; poorer attention went with lower dopamine activity in the left caudate in both groups. Its authors concluded that a dopamine problem as such is unlikely to be the main cause of ADHD in adults.²⁷

Dopamine transporter studies point both ways. Pooling nine studies, transporter levels were 14% higher on average in ADHD, with wide variation between studies. They were lower in people who had never taken stimulants and higher in those who had, so medication may shape what scans find.²⁸

Brain activity while waiting for a reward also differs between studies. A 2014 meta-analysis found a weaker ventral striatum response in ADHD (d about 0.5). In the general population, the same review noted, more impulsive people show a stronger response, the opposite direction, and the authors judged the studies too few to settle how the two fit together.²⁹ A later study of 150 adolescents and young adults with ADHD found stronger responses to reward in several regions, including the ventral striatum when the reward arrived; its authors called for replication.³⁰ In 16 adults without ADHD, methylphenidate, a common ADHD medicine, raised dopamine in the striatum during a maths task with money at stake, and made the task feel more interesting. This came from the same laboratory as the first PET study.³¹

Across 37 twin studies, ADHD heritability averages about 74%. Common gene variants of small effect explain roughly a third of that heritability.³² Earlier studies of single candidate genes found links with dopamine genes and with others, including serotonin genes and SNAP25, but results varied widely between studies.³³ A 2023 genome-wide study of 38,691 people with ADHD and 186,843 without found 27 risk regions. The genes there were enriched for genes active in early brain development, and overall genetic risk was linked with several kinds of nerve cell, including midbrain dopamine neurons. None of the 27 regions it reported lay in the dopamine transporter or D4 and D5 receptor genes.³⁴

On average, the striatum responds a little less to rewards in autistic people, for social and nonsocial rewards alike. A 2018 meta-analysis pooled 13 brain-imaging studies of 259 autistic and 246 non-autistic participants and found small effects (d about −0.2), and suggested that earlier mixed results may reflect the different ages of the samples; a 2021 meta-analysis found the clearest differences in the right putamen and nucleus accumbens.^35,36 In the large LEAP study, of 212 autistic people (about three quarters male) and 181 non-autistic people aged about 8 to 31, the ventral striatum responded less while waiting for social and money rewards, analyzed together. There was no reliable difference when the reward arrived.³⁷ These results do not support the idea that only social rewards are processed differently.^35,37

Co-occurring ADHD may change the picture. In LEAP, follow-up comparisons suggested the difference was largest in autistic participants without ADHD, although analyses using ADHD trait scores found no significant effect.³⁷ A 2026 meta-analysis of brain responses when a reward is received, covering 468 people with ADHD and 424 autistic people, found differences in the putamen and amygdala in both conditions, and differences in the prefrontal cortex that were specific to each.³⁸

Autistic interests seem to be an exception to the lower reward response. In the 2018 meta-analysis, pictures linked to restricted interests produced a stronger response in the caudate and nucleus accumbens of autistic people (d = 0.42, with a wide margin of uncertainty). This exploratory part of the analysis pooled only three studies, the three described next, and depended mainly on two of them.³⁵ In a study of 15 autistic and 16 non-autistic participants, the nucleus accumbens responded less to money but not to pictures of objects that often interest autistic people, such as trains and electronics.³⁹ In 39 autistic and 22 non-autistic young people, reward regions responded more to video clips of each person's own interest, mostly nonsocial ones such as video games, than to social approval, compared with non-autistic young people. In that study, a larger imbalance in the caudate went with more social difficulties, a correlation in one sample.⁴⁰

Strong interests are not unique to autism. A brain-imaging study compared 19 autistic children with 18 non-autistic children chosen for their strong hobbies. In both groups, emotion-related brain regions responded to pictures of the child's own interest. The autistic children responded more in the insula and anterior cingulate, and less broadly to other children's interests.⁴¹ These findings fit monotropism's picture of attention drawn to a few rewarding interests, but they do not test it.

Autistic writers return to special interests often, and describe them as part of who they are rather than as a symptom. Megan Anna Neff describes a "special interest ecosystem" and writes: "When I'm feeling overwhelmed or stressed, I turn to my interests for comfort and grounding because they provide a sense of stability and familiarity."^c3 Sol Smith calls "narrow interests" "one of the dumbest labels listed as a symptom of autism". Smith's interests moved from literature to history, quantum physics, philosophy and then autism, each explored in such depth that "narrow" seemed wrong, and Smith suspects the word helped delay recognizing being autistic until the forties.^c1 Devon Price writes that autistic people are "frequently shamed for having special interests", and that many were taught as children to tone their passions down.^c6

Daniel M. Jones suggests turning to a special interest when a meltdown is close, and explains its pull this way: "The autistic brain is constantly chasing dopamine, and you get a release of dopamine when you problem solve."^c9 That is Jones's explanation. The studies of interests and the reward system above are small, and they measured reward-region responses rather than dopamine.

Writers describe hyperfocus as both a gift and a cost. Neff calls it "a double-edged sword": it can bring flow, but it can also crowd out family, sleep and routine work.^c2 She sets "bumper rails" (exit plans, timers, and protected time; she keeps most Wednesdays free of meetings as a weekly hyperfocus day).^c2 Megan Griffith suggests building "exit ramps" into hobbies so hyperfocus does not run on too long.^c8 Price writes: "Some of us operate best on boom-and-bust cycles of intense hyperfocus followed by recuperation time."^c5

Writers who discuss both conditions draw a contrast and a link. Price writes that autistic and ADHD people both get absorbed in enjoyable activities, but "Autistics tend to perceive themselves as having more control over what they hyperfocus on than ADHDers do."^c4 Griffith presents monotropism as something autism and ADHD share: attention is a finite resource, and monotropic thinkers "tend to think more like a flashlight", focusing deeply on one thing. For that reason she suggests that AuDHDers look for work they are passionate about.^c7

Writers disagree on how far intense interests reach into ADHD. Pete Wharmby writes of special interests: "This phenomenon is one of the great universals of autism, so much so that it seems to bleed into other neurodivergencies, such as ADHD."^c10 The clinicians Donna Henderson, Sarah Wayland and Jamell White draw a firmer line in their diagnostic guide: people with ADHD have "an interest-based nervous system" that makes it hard to focus on what does not interest them, but not restricted or atypical interests.^c11

Autistic contributors to another guide by the same clinicians describe the cost of that pull. Holly G. says, "It's a special interest and not a hobby if it affects ADLs [activities of daily living]", and goes on to describe forgetting to eat, sleep or use the bathroom.^c12 Jesse P., who once combined a double major, a full-time night shift in an emergency room, college rugby and starting a goat dairy, writes, "Moderation is not my strong suit."^c13 Wharmby asks others not to break into hyperfocus with a sudden demand, and to warn of a coming change of task in stages, like the signs before a motorway junction.^c14