SPINs: Understanding Highly Focused Interests in Autism

Your child has memorized every train line in the country. Or they can tell you the name of every dinosaur that ever lived. Or they’ve watched the same 90-minute documentary about volcanoes 47 times and could narrate it from memory.

This is what researchers call a SPIN — a Specific and Intense Perseverative Interest. And it’s one of the most distinctive, powerful, and often misunderstood features of autism.

What Are SPINs?

SPINs — Specific and Intense Perseverative Interests — are deep, focused interests that are often narrow in topic but extraordinary in depth. They’re formally recognized in the DSM-5 diagnostic criteria for autism as “highly restricted, fixated interests that are abnormal in intensity or focus.”

But that clinical framing misses something important: for many autistic people, their special interests are sources of profound joy, identity, competence, and connection. They are not problems to be solved.

What SPINs Look Like

SPINs vary enormously in content and expression. They might be:

• A topic (trains, dinosaurs, a specific TV show, astronomy, a historical period)
• A system (maps, timetables, mathematics, weather patterns)
• An activity (drawing the same characters, organizing objects, building elaborate structures)
• A collection (rocks, bottle caps, receipts, figures)

What distinguishes a SPIN from an ordinary interest is intensity and specificity. The knowledge can be encyclopedic. The engagement can be hours-long. And often, the interest persists over months or years.

Why SPINs Matter

Research increasingly recognizes that SPINs serve important functions for autistic people:

• Emotional regulation: Engaging with a special interest can be deeply calming and restorative
• Identity and confidence: Being genuinely expert at something builds self-esteem
• Social connection: Shared interests are one of the most natural bridges to friendship
• Learning pathway: Many autistic learners absorb best through their areas of interest
• Career pathways: Deep, specific expertise is genuinely valuable in the world

How to Support SPINs

The most important thing you can do as a parent is to take the interest seriously. Not tolerate it — celebrate it. Ask questions. Learn alongside them. Let them teach you.

You can also use SPINs as leverage for learning: a child obsessed with trains will learn fractions more readily if the problems involve train schedules. A child who loves dinosaurs will write more readily if the topic is paleontology.

Where limits are genuinely needed — because the interest is crowding out sleep or other essential activities — the approach should be collaborative and explicit, not suppressive. Work with your child, not against them.

Herd is a resource for parents navigating sensory processing differences and neurodivergence. We’re not medical professionals — always work with qualified clinicians for assessment and treatment planning.