Special interests — also known as SPINs, intense interests, or passionate interests — are deeply focused areas of engagement that autistic people experience with a level of emotional investment, sustained attention, and joy that goes beyond what is typically associated with hobbies. Clinically categorised under restricted repetitive behaviours, special interests are one of the defining characteristics of autism. For many autistic adults, they are a primary source of motivation, regulation, identity, and connection.
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Why do autistic people have special interests?
The short answer is that autistic brains are built for depth. The longer answer involves two things working together: a processing style that naturally concentrates attention into fewer, deeper channels, and a reward system that responds more strongly to interest-driven engagement than to conventional incentives. These are not deficits. They are structural features of how autistic cognition works, and they explain both why special interests exist and why they feel the way they do. The sections below explore what that experience is like and then why the brain produces it.
What makes an interest “special”?
Research with autistic adults shows that people define special interests in different ways.1 Some emphasise duration — the sheer amount of time spent thinking about, researching, or engaging with the interest. Others describe the emotional experience — an intensity of joy, calm, or purpose that is difficult to convey to someone who has not felt it. Others define special interests by comparison — distinguishing them from regular hobbies or interests by something harder to pin down, a quality one participant called “that magic ingredient.”1
Between 75% and 95% of autistic people have at least one special interest, and 82% of those report more than one23. This finding directly contradicts the clinical assumption that autistic interests are narrow or singularly fixated.
The term “special interests” itself carries some ambivalence. It originated in early medicalised descriptions of autism, and the word “special” can feel patronising.
Alternative terms circulate in the community — SPINs (a contraction of “SPecial INterests”), intense interests, passionate interests — but none have fully replaced the original. Many autistic people continue using “special interests” because it communicates the concept to both autistic and non-autistic audiences, even when they are not entirely comfortable with the phrasing.1
Special interests and other “repetitive behaviours”
Special interests sit within the restricted repetitive behaviours (RRBs) category in diagnostic frameworks, alongside stimming, routines, and sensory-seeking patterns. As a clinical grouping, this makes some structural sense — all of these behaviours involve patterns of focused, repeated engagement. But experientially, the comparison falls apart quickly. The felt experience of a special interest has very little in common with the felt experience of needing to take the same route to work. Grouping them under one umbrella risks flattening a rich and varied set of experiences into something that sounds like a single symptom.
Special interests and stimming also share something that other forms of RRBs do not always have: they are both actively pleasurable. Routines and insistence on sameness can bring relief and safety, but that is the absence of distress rather than the presence of joy. Stimming and special interests both generate positive affect in their own right. They are not just calming, but genuinely rewarding.
When everything under the RRB umbrella gets treated as a symptom to be managed, this distinction disappears, and with it the recognition that some of these experiences are among the best parts of being autistic. The restricted repetitive behaviours entry explores this broader category in detail.
What does having a special interest feel like?
For many autistic adults, special interests are the single most reliable source of positive emotion in their lives. Survey respondents describe engagement with their interests as making them “very happy” (58%), with a further 33% reporting it makes them happy.3 In qualitative research, participants describe the experience in terms that go well beyond enjoyment: “It’s almost like a balm to the overwhelm of everything around me.“1 Another described special interests as “something that I’m motivated to do, even when I’m not motivated to do things. Like when I’m depressed, they give me a reason to get out of bed.“1
When inertia makes it impossible to start anything else, when executive dysfunction has shut down the capacity to plan or prioritise, the special interest can still break through. It is often the one thing that remains accessible when everything else has become too effortful, which is part of why being separated from it feels so destabilising.
How much time is spent on special interests?
Autistic adults in one survey reported spending an average of 39 hours per week engaged with their special interest.3 That is a full-time job’s worth of engagement. The figure may sound alarming from the outside, but consider what those hours are actually doing. Special interests are a primary source of joy, regulation, and recovery from the demands of navigating a world not built for you. Spending a full-time job’s worth of hours regulating from your actual full-time job starts to make sense.
Research supports this interpretation — one study found that more frequent engagement with special interests was associated with higher levels of camouflaging, and the most likely explanation is that people who spend more energy masking depend more heavily on their interests to recover from the exhaustion.9 The hours are not wasted or compulsive. They are the necessary cost of staying functional in environments that demand constant adaptation, and the reward system’s way of restoring what gets depleted.
Sharing is a way to form connections
This drive to share what you know — what the autistic community calls info dumping — is a natural extension of how special interests become communicative acts, a way of offering someone else a piece of what matters most to you.
The emotional texture goes beyond happiness. Participants describe a sense of calm, of being grounded, of the world making sense through the lens of the interest. One person described their special interest as “the framework through which I view the world… that thing that provides structure and always makes sense.”1 Another called it an “access point” — a way for other people to connect with them where they actually are, rather than where others might wish them to be.1 Special interests are not a retreat from the world. For many autistic people, they are the primary means of engaging with it.
Why are special interests so intense?
Two complementary explanations help account for the depth and intensity that characterise special interest engagement.
The depth of focus: monotropism
Monotropism — a theory of autistic cognition developed by autistic researchers Dinah Murray, Wenn Lawson, and Mike Lesser — describes a processing style where fewer interests are active at any given time, but each one attracts more of the brain’s available resources.4 Where a polytropic (broad-focus) mind has many interests gently aroused simultaneously, allowing easy movement between them, a monotropic mind concentrates its processing resources into fewer, deeper channels. The focus is more intense, the engagement more thorough, and the emotional investment in whatever currently holds attention is greater.
This means that when an autistic person is engaged with a special interest, the engagement is not superficial by design. The brain is allocating the full weight of its attentional resources to that one thing. The depth of knowledge, the hours of research, the drive to understand every facet of a subject — these are natural products of how the attentional system works, not symptoms of something going wrong.
The intensity of joy: reward circuitry
Monotropism explains why the focus goes so deep. But it does not fully explain why the engagement feels so good — why special interests produce a quality of joy, calm, and satisfaction that autistic people consistently describe as unlike anything else in their lives.
Neuroimaging research offers part of the answer. A meta-analysis of fMRI studies found that autistic brains show heightened activation in the caudate and nucleus accumbens — key structures in the brain’s reward and motivation circuitry — when engaging with interest-related stimuli.5 At the same time, these same reward structures showed reduced activation in response to conventional rewards like money or generic social feedback.56
The reward system is not broken. It is tuned differently. The things that light up a neurotypical reward system — monetary incentives, social approval, competitive achievement — produce less of a response. The things that matter to the person — the subjects they have chosen to invest in — produce more. The dopamine pathways that underpin motivation and pleasure are responding to a different set of signals, and those signals are often the ones generated by deep engagement with a special interest.
Together, monotropism and reward tuning explain both dimensions of the special interest experience. The depth of focus comes from how attention is allocated. The intensity of the joy comes from how the reward system responds. One produces the sustained engagement; the other produces the emotional payoff. You cannot fully understand special interests without both.
Are special interests obsessions?
Short answer: no, they are not.
Clinical language has historically placed special interests alongside obsessive-compulsive behaviours, and the word “obsession” still gets applied casually to autistic interests by people who do not understand the difference. The neuroimaging evidence makes that difference visible.
Obsessions in OCD are ego-dystonic — the person does not want them. They are intrusive, distressing, and associated with anxiety circuitry. The brain is caught in a loop it cannot escape, and the emotional signature is dread, not delight.
Special interests are ego-syntonic — the person loves them. They are chosen, cherished, and associated with reward circuitry. The brain is engaged because the engagement feels good, and the emotional signature is joy, calm, and purpose.
From the outside, both patterns can involve intense focus on a narrow topic, and both can involve repetitive engagement. But the internal experience is opposite. Autistic adults describe their special interests with language like “nurturing,” “a balm,” “the spark that makes life worth living.”13 These are not the words of someone trapped in a compulsive loop. When distress does arise around special interests, it almost always comes from external sources — being prevented from engaging, being shamed for the interest, or being told the interest is wrong or “too much” — rather than from the interest itself.
How autistic people engage with their interests
While the topics of special interests vary enormously, the way autistic people engage with them shows recognisable patterns. Research across both autistic and neurotypical groups shows that autistic adults report more intense engagement with areas that lend themselves to deep analysis, pattern recognition, and the building of internal knowledge systems.7 This drive to understand the rules, structures, and interconnections within a subject appears across all kinds of interests — from the person who can explain the precise chemistry of pigment binding in cosmetics, to the person who has mapped every evolutionary clade, to the person cross-referencing Jungian and esoteric interpretations of tarot cards across multiple published sources.
The topic is the surface. The processing style is the constant.
This is why someone can appear to have “many different interests” over a lifetime — dinosaurs as a child, corvid behaviour as an adult, evolutionary biology in between — while the underlying drive remains the same. The fascination is not really with dinosaurs or crows specifically. It is with complex non-human systems, with building knowledge from observation, and with going deeper into a subject than most people would think to go. The subject changes. The way the brain engages with it stays constant. Recognising this pattern can be particularly valuable for late-identified adults who dismissed their own interests because the topics kept shifting, never realising the engagement style was the through-line all along.
Why autistic people love libraries, museums, and collections
A related pattern involves the satisfaction of collections and curated environments. Libraries, museums, and botanical gardens hold a particular appeal for many autistic adults, and the reason goes beyond simply “having a lot of the thing.” These environments are curated — someone has already done the organising, categorising, and depth-building work. A library is not just a large number of books. It is books organised by subject, cross-referenced, catalogued, and retrievable. A botanical garden is not just a lot of plants. It is plants organised by taxonomy, labelled, and contextualised. These environments mirror the way a monotropic processing style already wants to engage with information: systematically, thoroughly, and with everything in its place.
For many people, the organising itself is inseparable from the interest. Collecting information, categorising it, building reference systems, maintaining and reorganising notes — these activities are not separate from the special interest. They are a core expression of it. Someone who spends an evening reorganising their research notes without touching the primary source material is not procrastinating on their interest. They are actively engaged with it because the knowledge architecture is part of what the brain finds satisfying.
Interests that get missed
Gender and late diagnosis
The research on special interests has overwhelmingly studied boys and men, and the examples embedded in diagnostic frameworks — trains, numbers, technology, maps — reflect that history. When the diagnostic lens is built around those categories, everyone whose interests do not match the stereotype risks being overlooked.
Women and girls frequently have special interests of equal intensity to men’s, but in different topic areas. The most common interest areas for autistic women include nature and gardening, psychology, animals, art, and culture2 — subjects that are socially normative for women and therefore do not trigger the “that’s unusual” recognition that might prompt a referral. A meta-analysis of sex differences in restricted and repetitive behaviours found that differences between males and females exist primarily in interest content, not in intensity.8 The depth, the hours spent, the emotional investment, the identity integration — these are equivalent. The topic just does not raise the same flags.
When an autistic girl’s special interest is horses, she looks like “all girls love horses.” Or, when it is psychology, she looks like a thoughtful, empathetic student. And when it is fashion or make-up, she looks like a typical teenager. Nobody sees the encyclopaedic knowledge of equine genetics underneath the horse interest, or the systematic cross-referencing of therapeutic modalities underneath the psychology interest, or the ingredient-level analysis of product formulations underneath the make-up interest. The interest passes as normal because the subject matter fits the gender expectations. The engagement pattern — the actual autistic part — becomes invisible.
Research has confirmed that the types of interests associated with girls and women are frequently not recognised as special interests because they do not align with stereotypically “high autism”(numbers, transportation, technology) topics. 8 This contributes to later diagnosis, missed diagnosis, and years or decades of feeling like something is different without having the language for it.
When the topic of interest is people
Some special interests centre on people, relationships, fictional characters, or social systems — areas that might seem incompatible with the “autistic people aren’t interested in people” stereotype but are in fact common, especially among autistic women and non-binary people. Research has found that when special interests involve other people — through fan communities, cooperative activities, or character-focused media — the person’s engagement can look indistinguishable from typical social participation.9 The interest itself becomes a form of camouflage, because depth-processing of social material presents as social competence.
This connection between people-centric interests and masking deserves attention. If your special interest involves people — psychology, relationships, community dynamics, fictional characters — then your engagement with it can look indistinguishable from social competence. You are reading people closely, tracking relational dynamics, building nuanced models of human behaviour. From the outside, that reads as socially skilled and empathetic. From the inside, it is autistic depth-processing applied to social material. The interest itself becomes a vehicle for camouflaging, because the autistic engagement pattern is hidden behind subject matter that looks neurotypical.
One study found that greater involvement of people in interest activities specifically predicted more assimilation-related camouflaging — the kind of masking that involves taking on a persona, forcing oneself into social situations, and adjusting behaviour to fit in.9 The interest is genuine and deeply felt, but the social participation it produces can mask the autistic processing style underneath. The study’s sample notably included people actively seeking a diagnosis alongside those already diagnosed9 — an important detail, because many people in the pre-diagnosis space have had their interests camouflaging their autism for decades without either they or the professionals around them recognising the pattern.
When the autistic special interests is… autism
It is also worth noting that autism itself frequently becomes a special interest for newly identified adults. In one large study, autism was among the top interest areas reported, particularly for those diagnosed later in life.2 The voracious reading, the cross-referencing of traits and experiences, the building of frameworks for self-understanding — this is a special interest in action. If you are reading this glossary entry and recognise yourself in that description, you are doing exactly what your brain is built to do with a subject that matters to you.
Special interests, hyperfixation, and the AuDHD experience
One of the most common questions people have when first learning about special interests is wanting to understand the difference between special interests and hyperfixation. The two experiences overlap in some ways — both involve intense focus on a subject — but they differ in duration, emotional quality, and what happens when the engagement ends.
Hyperfixation, which is more commonly associated with ADHD, tends to be rapid in onset, intensely absorbing for a period of weeks or months, and then drops off — sometimes suddenly, sometimes gradually, but usually completely.
Special interests, by contrast, tend to be sustained over years or decades, emotionally nurturing, and closely woven into how the person understands themselves and the world. One multiply neurodivergent participant drew the distinction clearly: hyperfixation is “short-term, and not necessarily about a topic”, but more situational, while special interests “have to do with a particular topic. And I think there has to be a sort of appreciation and love behind it.“1
ADHD and the “hobby graveyard”
The “hobby graveyard” is a widely recognised experience: the beading supplies bought enthusiastically and never touched again, the ukulele gathering dust, the microgreens growing phase that lasted three weeks.
But framing this as a graveyard does the experience a disservice. However long the engagement lasted, the joy was real. The learning was real. The regulation provided during those weeks or months was real. A fascination that burned brightly for six weeks and then released you is not a failure — it is how ADHD engagement works. If the financial dimension of cycling through hobbies is a concern, there are ways to engage that do not require buying in fully every time: borrowing equipment, using libraries, joining online communities, and trying before committing. The goal is to find ways to honour the curiosity without the pattern becoming financially unsustainable, not to stop the cycling itself.
How long does an interest need to last before it “counts”?
There is a temptation to interpret “lifelong” literally — as though you need to have started in utero for it to qualify. An interest that lasted a decade and then faded was still a special interest. And sometimes what looks like a series of different interests is actually a single, deeper fascination expressing itself through different subjects. A child drawn to dinosaurs — ancient creatures, taxonomies, evolutionary biology, behavioural speculation from fossil evidence — who grows into an adult befriending crows has not changed interests.
The interest is something deeper: complex non-human intelligence, perhaps, or biological systems, or the pleasure of building knowledge about creatures whose inner lives you have to piece together from observation. Someone who went from horses to dogs to marine biology might think they do not have a special interest because the topic kept changing. But if the engagement pattern — the depth, the information hunger, the systematising, the joy — stayed the same across all of them, that is the special interest. The topic is the surface. The processing style is the link.
Can you have a hobby graveyard and special interests as well?
Yes, you absolutely can.
For AuDHD people, both patterns coexist, and this can create confusion about which interests “count.” Some interests stick for decades. Others cycle in and out over months. Some persist for years and then drop completely. Some return after a period of dormancy, as though they had been waiting. These are not failures of one pattern or the other. They are two attentional systems interacting — the ADHD novelty-seeking sometimes overriding the autistic depth, the autistic sustained focus sometimes anchoring an interest past the point where the ADHD brain would normally move on.
Rather than a binary (special interest or hyperfixation), what emerges is a spectrum of engagement patterns: the rapid cycle, the long burn, the lifelong constant, the dormant return. For multiply neurodivergent people, recognising that multiple patterns can coexist within one person — and that none of them invalidates the others — can be a significant relief. The formal research comparing these patterns directly is still sparse, and much of what is understood here comes from community knowledge and lived experience rather than published studies.
Why special interests feel like part of who you are
Special interests are not hobbies that happen to be intense. For many autistic adults, identity is inseparable from their interests. It is part of how they understand themselves, relate to others, and make sense of the world. Research participants describe their interests not as something they do but as something they are: “the framework through which I view the world,“1 “a core part of my identity,”3 an “access point” through which other people can connect with them.1
This identity integration has implications. When someone’s interest is dismissed, ridiculed, or suppressed, the message received is not just “your hobby is weird.” It is “something fundamental about who you are is wrong.” As one participant put it, “whenever you shame a special interest, or whenever you try to teach someone that their special interest isn’t okay, you run the risk of causing extreme anxiety and self-doubt and shame within the person.“1
Info dumping — sharing extensively about your interest — is often the point at which other people’s discomfort becomes visible, and learning to suppress it is one of the earliest forms of interest-related masking many autistic people experience.
For late-identified autistic adults, recognising past interests as special interests often becomes part of the diagnostic recognition process. The pieces start fitting together retrospectively: the childhood interest that adults found amusing or concerning, the teenage passion that was dismissed as a phase, the adult engagement that was never quite explainable as “just a hobby.” Calling these special interests — giving the pattern a word — can be part of rebuilding a narrative that makes sense.
Masking, shame, and the cost of hiding
Special interests and masking are more closely intertwined than they might first appear. Research shows that more frequent engagement with special interests predicts higher levels of camouflaging behaviour 9, and the most likely explanation is not that interests cause masking but that the relationship runs in the other direction: people who mask heavily depend more on their interests as a recovery resource. The interest becomes the place where you can stop performing, stop monitoring yourself, stop being someone you are not. The more depleting the masking, the more essential the interest becomes.
This creates a painful cycle. Masking exhausts you. The interest restores you. But the interest is also something you have learned to hide — because it is “too much,” because other people do not understand it, or because engaging with it publicly marks you as different.
One survey respondent described the specific sting of work meetings where colleagues share weekend activities: “I feel like I have nothing to say because I don’t want to share that I spent it making fan videos about witches in a kids’ TV show.“3 Another asked simply, “Why can’t I wear my hand-sewn medieval dress to the supermarket?“3
What happens when special interests are suppressed?
The data on what happens when interests are suppressed or stigmatised is clear. Bullying related to special interests is a significant predictor of higher depression, anxiety, and stress in autistic adults.3 Not being employed in work related to one’s special interest predicts higher depression specifically.3 Lacking support from people in one’s life for the interest predicts higher stress.3 Greater distress when forced to disengage from an interest predicts more masking-related camouflaging behaviour.9
Broader masking research confirms the wider pattern: autistic adults who mask more report lower self-esteem, lower authenticity, greater self-alienation, and more symptoms of depression and anxiety.10 Past interpersonal trauma — being shamed, teased, or criticised for autistic traits — predicts more masking.10 For many people, the shaming started specifically with their interests: being told they talk about it too much, being excluded for caring about the “wrong” things, learning to read the room for signs that their enthusiasm is unwelcome.
The grief of suppression is more than just about something lost, because it was also a primary source of regulation, identity, and joy. And it was taken away precisely because it was too visible, too intense, “too autistic”. For late-identified adults, this grief often surfaces during or after diagnosis, when the retrospective question becomes unavoidable: what would my life have looked like if I had been allowed to pursue this freely?
What happens when an interest fades?
There is another kind of loss that gets discussed less, partly because the dominant narrative around special interests emphasises their persistence. Special interests are supposed to last. They are supposed to be lifelong. So when one fades on its own — not suppressed by anyone, not shamed into hiding, just… gone — the experience can be disorienting in ways that go beyond simple disappointment.
When an interest that served as your primary source of regulation, joy, and daily structure quietly stops engaging you, what is left is not just the absence of something you enjoyed. It is an unserved regulatory function, a gap in your identity, and a daily routine with a hole in it. Unlike the ADHD pattern, where the next interest typically arrives almost immediately, an autistic special interest that fades can leave a void that persists. As one participant described it: “once you’ve had one, if you don’t have like a current one, everything feels dull and gray.“1
Does it count as a special interest if it did not last forever?
This experience can also produce a particular kind of self-doubt. If special interests are supposed to be lifelong, does losing one mean it was never a “real” special interest? Does it mean you are less autistic than you thought? The temptation to interpret the diagnostic criterion literally — as though an interest that lasted ten years but not a lifetime somehow fails to qualify — is understandable but unhelpful. Special interests are defined by the quality and intensity of the engagement, not by a minimum duration requirement. An interest that consumed you for a decade and then released you was a special interest. The loss is real, even if the interest was not permanent.
The formal research on this particular experience is thin. The academic literature has focused on the benefits and characteristics of active special interests, not on what happens when they end naturally. But the experience is widely recognised in autistic communities, and it is important to mention — both for the people currently in the gap, and for those who might otherwise dismiss their own history of intense engagement because it did not last forever.
How to support and protect your special interests
One important caveat about the research landscape: a large portion of the published literature on special interests focuses on incorporating them into interventions — using interests as tools to achieve therapeutic, educational, or social goals.11 While this research has found positive outcomes in areas like social skills and academic engagement, it represents a fundamentally different orientation from the one taken here. Special interests are not valuable because they can be harnessed to make autistic people more productive or socially compliant. They are valuable because they bring joy, meaning, identity, and regulation to the people who have them. The distinction between respecting an interest and instrumentalising it is crucial.
The research consistently points to the same conclusions about what supports wellbeing: open engagement, social acceptance, and freedom from pressure to suppress.
Sharing your interest
Autistic adults who openly engage with their interests report higher well-being and greater satisfaction with leisure.2 The motivation behind the engagement matters — when the drive is intrinsic (engaging because it genuinely feels good) rather than extrinsic (engaging for external approval or reward), the association with wellbeing is strongest.2 Having people in your life who support and encourage your interest is associated with lower stress, and the absence of that support predicts higher stress.3
Community involvement
Autistic community spaces where sharing interests is welcomed play a particular role. Research participants describe the experience of other autistic people wanting to hear about your interest — even when they do not share it — as “a really beautiful thing.”1 Sharing special interests has become a feature of autistic social spaces, with events like “PowerPoint nights” where people present on their interests to an audience that actively wants to hear them. The contrast with neurotypical social settings, where monitoring how much you talk about a subject is a constant background task, is significant.
Broader research on autistic community participation supports this: greater involvement in autistic communities is associated with lower masking, higher self-esteem, and more authentic living.10 Having spaces where the interest does not need to be hidden or tempered is protective in a measurable way.
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