Summary
Autistic people tend to develop intense, sustained interests. The diagnostic manuals call this “highly restricted, fixated interests that are abnormal in intensity or focus” (DSM-5-TR criterion B.1). The autistic community calls them special interests, sometimes abbreviated to SpIns. The language matters, because the framing determines whether these interests are understood as symptoms to be managed or as a central, positive feature of autistic cognition.
The research increasingly supports the second view. Special interests are associated with higher subjective wellbeing, better mental health, increased self-confidence, and reduced anxiety. They provide entry points for social connection, career development, and self-regulation. Suppressing or restricting them, as some behavioural approaches have done, removes one of the most reliable sources of autistic wellbeing.
The language problem
The DSM-5-TR places intense interests under Criterion B: “Restricted, repetitive patterns of behaviour, interests, or activities.” The specific wording is “highly restricted, fixated interests that are abnormal in intensity or focus.” Every adjective in that phrase does work: restricted implies narrowness, fixated implies rigidity, abnormal implies deviation from a norm. Together they frame autistic interest patterns as pathological.
Research does not support this framing cleanly. Anthony, Kenworthy, Yerys, Jankowski and Wallace (2013) found that autistic interests are more intense than neurotypical interests, but not necessarily more restricted. Autistic people reported a similar number of interests to neurotypical peers; the difference was in the depth and persistence of engagement. Calling these interests “restricted” mischaracterises what is actually happening.
The autistic community’s preferred language, “special interests,” captures the subjective experience more accurately. These interests are special in the sense that they are deeply meaningful, intensely pursued, and central to identity. Some people use “passionate interests” or “SpIns.” The clinical literature uses “circumscribed interests” (Klin et al., 2007), which is more neutral than the DSM language but still frames the phenomenon from the outside.
This wiki uses “special interests” as the default term, following the preference of the autistic community while noting the clinical terminology.
What the research shows
Wellbeing
Grove, Hoekstra, Wierda and Begeer (2018) studied 175 autistic adults and found that special interests were positively associated with subjective wellbeing and negatively associated with loneliness. The more time people spent engaged with their special interests, the better they felt. The relationship held regardless of whether the interests were social or solitary.
This finding has been replicated and extended. A 2020 pilot study using the Special Interests Survey (Nowell, Warren, Rubin and Worley) found that 93% of autistic adults reported at least one current special interest, with a mean of nine interests per person. The breadth contradicts the “restricted” framing. Television, objects, music, animals, and technology were among the most commonly reported categories, which are unremarkable interests by any standard; what distinguished them was the depth and intensity of engagement.
Social connection
Special interests are often characterised as solitary or isolating, but the evidence is more nuanced. Many autistic people find social connection through shared interests: online communities, conventions, clubs, and workplaces organised around specific domains. The autistic preference for interaction built around shared activity and information exchange (rather than small talk and social performance) means that special interests provide a natural social structure.
Therapeutically, this is well supported. A 2026 scoping review of 39 studies (covering 1995–2025) found that interventions incorporating special interests produced positive outcomes for social communication, reduced social anxiety, and increased sense of belonging. When the interest is the medium of interaction rather than the obstacle to it, social outcomes improve.
Self-regulation
For many autistic people, engaging with a special interest is a form of self-regulation: it reduces anxiety, provides predictability, and restores energy after demanding social or sensory experiences. This is consistent with monotropism theory (see Dinah Murray): monotropic attention resting in its preferred channels is regulating; being pulled away from those channels is dysregulating.
The implication is that restricting access to special interests, as some behavioural interventions have historically done, may actively harm autistic wellbeing. If the interest serves a regulatory function, removing it removes a coping mechanism without providing an alternative. The evidence on autistic burnout is relevant here: burnout is associated with sustained demands without adequate recovery, and for many autistic people, special interests are recovery.
Identity and meaning
Special interests are not just hobbies. For many autistic people, they are central to identity. “I am someone who knows everything about trains” or “I am the person who can identify any bird by its call” is not a description of a leisure activity; it is a statement about who someone is. Late-diagnosed autistic people sometimes describe the moment they learn the concept of special interests as a moment of recognition: the thing they had been doing all their lives, which others found odd or excessive, suddenly has a name and a community of people who understand it.
This identity dimension means that dismissing, mocking, or pathologising special interests is experienced as a rejection of the person, not just a comment about their hobby. Clinical and educational approaches that treat special interests as leverage (permitting engagement as a reward, withdrawing it as a consequence) risk instrumentalising something that is core to the person’s sense of self.
Special interests vs. ADHD interests
The interest patterns in autism and ADHD differ in characteristic ways, and the distinction is clarifying.
Autistic special interests tend to be persistent. The same topic may hold a person’s attention for months, years, or a lifetime. Engagement is deep and cumulative: the person builds expertise over time, often reaching a level of knowledge that rivals or exceeds professionals in the field. The reward comes from depth.
ADHD interests tend to rotate. A new topic captures attention intensely for days or weeks, then gives way to the next. The initial phase of engagement can be just as intense as an autistic special interest, but it typically does not persist. ADHD communities sometimes call these “flavour of the month” interests. The reward comes from novelty.
In AuDHD, both patterns operate simultaneously: the autistic system generates persistent deep interests while the ADHD system generates rotating novel ones. Some people experience this as having one or two lifelong special interests alongside a constantly shifting set of shorter fixations. Others experience it as painful conflict: the desire to go deep competing with the pull toward something new.
The accommodation question
The practical question for families, schools, and workplaces is whether to accommodate or redirect special interests. The evidence points consistently toward accommodation.
In education, incorporating special interests into learning materials improves engagement, comprehension, and behavioural outcomes. An autistic child who will not engage with a standard maths worksheet may engage readily with one framed around their special interest in trains or dinosaurs. The learning objective is the same; the route to it is different.
In employment, workplaces that allow autistic employees to work within their areas of deep interest tend to see high performance, reliability, and job satisfaction. The challenge is not the intensity of the interest but the inflexibility of workplace structures that prevent alignment between interest and role.
In daily life, the question is one of balance rather than restriction. An autistic person who is eating, sleeping, maintaining relationships, and meeting their responsibilities while spending substantial time on a special interest does not have a problem. The interest is doing its job. Intervention is warranted only when the interest is displacing essential needs, and even then, the goal should be to support the person in meeting those needs alongside the interest, not to eliminate the interest itself.
Key sources
- Grove, R., Hoekstra, R.A., Wierda, M. & Begeer, S. (2018). Special interests and subjective wellbeing in autistic adults. Autism Research, 11(5), 766–775. doi: 10.1002/aur.1931
- Anthony, L.G., Kenworthy, L., Yerys, B.E., Jankowski, K.F. & Wallace, G.L. (2013). Interests in high-functioning autism are more intense, interfering, and idiosyncratic, but not more circumscribed, than those in neurotypical development. Development and Psychopathology, 25(3), 643–652. doi: 10.1017/S0954579413000072
- Klin, A., Danovitch, J.H., Merz, A.B. & Volkmar, F.R. (2007). Circumscribed interests in higher functioning individuals with autism spectrum disorders: an exploratory study. Research and Practice for Persons with Severe Disabilities, 32(2), 89–100. doi: 10.2511/rpsd.32.2.89
- Nowell, K.P., Warren, Z.E., Rubin, E.S. & Worley, J.A. (2020). Characterization of special interests in autism spectrum disorder: a brief review and pilot study using the Special Interests Survey. Journal of Autism and Developmental Disorders, 51, 2711–2724. doi: 10.1007/s10803-020-04743-6
- Murray, D., Lesser, M. & Lawson, W. (2005). Attention, monotropism and the diagnostic criteria for autism. Autism, 9(3), 139–156. doi: 10.1177/1362361305051398