Sensory Processing and Autism: What Changed in 2022

1 · What changed in 2022

Sensory processing differences are now part of the diagnostic criteria for autism.They were recognized clinically for decades before that. The DSM-5 put them in the criteria themselves in 2013, and ICD-11 followed in 2022. Sensory difference is not an add-on to autism. It is part of the definition.

Three things follow from that, and they are practical rather than academic.

If your child was assessed before 2022, sensory processing may never have been formally evaluated

Assessments carried out under an older framework, or by a clinician still working from one, may not have looked at sensory processing at all. It is entirely reasonable to ask for that specifically — and to ask what was and was not assessed the first time.

It reframes what sensory support is for

If sensory difference is part of what autism is, then sensory support is not an optional extra bolted onto autism support. It is part of it. That matters when a school, an insurer, or a service treats sensory accommodations as a nice-to-have.

It validates what autistic people have described for a very long time

The accounts came first, by a long way. The criteria caught up with them.

2 · What sensory differences actually look like

The most common misconception is that this means being sensitive. It runs in both directions, and frequently in both directions in the same person.

Over-responsivity

Input registers as more intense or more aversive than expected. Sounds other people filter out stay in the foreground. Clothing tags, seams and textures are genuinely uncomfortable rather than a preference. Fluorescent lighting is visible as flicker.

Under-responsivity

Input registers less, or later. A child may not notice being called, may seem unaware of temperature or of a minor injury, or may need more input before something registers at all.

Seeking

Actively pursuing input that helps — movement, deep pressure, particular textures, particular sounds. This is regulation, not misbehavior.

Discrimination differences

Difficulty telling similar sensations apart, which affects everything from handwriting pressure to identifying where a sound came from.

These coexist. The same person can be over-responsive to sound and under-responsive to proprioception. Both can change day to day depending on fatigue, stress, illness, and how much sensory demand the day has already carried — which is why a response that seems inconsistent usually is not.

Beyond the five senses

Vestibular — balance and movement, affecting comfort with swings, heights, escalators, and being tipped backward.

Proprioception — body position and force, affecting coordination, how hard someone grips, and how much pressure they seek out.

Interoception — internal signals: hunger, thirst, temperature, needing the bathroom, and the physical sensations of emotion. Differences here are common in autism and are rarely explained to families, and they are why "use your words" can be an impossible instruction in the middle of distress — the internal state has to be readable before it can be named.

3 · Sensory overload

What it is: more input than the system can process at once. It is not a choice and it is not a behavior.

What it can look like: distress and meltdown · shutdown and withdrawal · leaving abruptly · covering ears or eyes · increased stimming · irritability that seems disproportionate to what just happened.

Meltdown and shutdown are the same underlying process with different outward presentations.A child who goes silent and still is not coping better than one who is visibly distressed. They are frequently coping less well — and because a quiet response does not interrupt anyone, they usually get less help rather than more.

Load accumulates

A child who manages a whole school day and falls apart within ten minutes of getting home has not had a bad evening. They have spent the day's capacity holding it together, and home is where it is finally safe to stop.

Masking costs sensory capacity

Suppressing a response to input is effortful, and the effort is invisible to everyone except the person doing it. A day that looked unremarkable from outside can have been expensive.

Recovery takes time, and it is not optional

Quiet, low-demand time after a demanding environment is doing something. It is not avoidance, and filling it with a different demand undoes it.

4 · What the evidence actually supports

This is the part of the topic where marketing and evidence have drifted furthest apart, so it is worth being specific about which is which.

What has reasonable support

Ayres Sensory Integration. A specific, manualized approach delivered by an occupational therapist with particular training, in an environment set up for it, with fidelity measures that check the approach was actually delivered as designed. It has moderate-quality evidence for autistic children.³

Environmental modification. Changing the setting rather than the person. This has performed more consistently than sensory input applied to a child, and it is also the most available and least expensive option — which is an unusual combination and worth taking advantage of.

Accommodation and demand reduction. Noise-reducing headphones where a person chooses them, predictable routines, advance notice of change, and low-demand recovery time.

What has weaker support than commonly claimed

Weighted blankets and weighted vests have repeatedly been found to have little or no effect on the outcomes claimed for them — attention, arousal, and behavior. They are widely sold and widely recommended, including by people acting in good faith. Some people find them comfortable, and comfort is a perfectly legitimate reason to use something. That is a different claim from a therapeutic effect, and it is the conflation of the two that is the problem.

Sensory diets — structured programs of scheduled sensory activity — are widely used, and the evidence for them specifically is considerably weaker than for Ayres Sensory Integration.⁴

Individual sensory-based techniques delivered outside a full ASI approach⁵ — brushing protocols, listening programs, and similar — generally lack supporting evidence.

This distinction matters because "sensory integration therapy" is used loosely to describe both.The same phrase covers a manualized approach with moderate evidence and a set of individual techniques with very little. Ask any provider which they mean, what training they have, and what the goals are — and what would count as it not working.

On ear protection specifically

Noise-reducing headphones help many people access environments they otherwise could not, and for a lot of autistic people they are the difference between attending something and not.

There is also a clinical concern that all-day use in the absence of noise may increase sensitivity over time. This is not settled by research in either direction. It is worth knowing, and worth discussing with an occupational therapist rather than assuming either way — and it is not a reason to remove something a person relies on.

5 · What actually helps day to day

Change the environment first. Lighting, noise, crowding and predictability are usually far more modifiable than a person's sensory system.

Give control. Being able to leave, to choose a seat, to wear headphones, to opt out — control over sensory exposure reduces distress independently of the exposure itself. The same room is easier when leaving it is allowed.

Plan for recovery, not just for coping. Time after a demanding environment belongs in the plan rather than being what is left over.

Watch the pattern, not the moment. The trigger is frequently not what happened immediately before — it is the accumulated load that made this particular thing the last one.

Accept the accommodation. A child who needs the same clothes, the same food, or the same route is managing something. Insisting on flexibility for its own sake spends capacity that has better uses.

6 · Stimming

Stimming, short for self-stimulatory behavior, refers to repetitive movements or sounds — hand-flapping, rocking, spinning, humming, tapping. These behaviors help regulate sensory input, manage stress, and express excitement or frustration.

Stimming has a genuine sensory and emotional function. It can calm an overwhelmed nervous system, or provide needed stimulation in an environment with too little input. Unless it is harmful, stimming should not be discouraged — it is a healthy form of self-regulation.

Where a stim is causing injury, the useful response is to work out what it is doing and offer a safer route to the same thing, rather than to suppress it and leave the need unmet.

7 · At school

Accommodations that commonly help:

Seating away from noise and foot traffic
Permission to leave for a break without having to ask
Noise-reducing headphones
Advance notice of changes, fire drills, and assemblies
An alternative to the cafeteria
Reduced or alternative uniform requirements
A quiet space that is not a punishment, and is not the same room used for discipline

These belong in writing. A verbal agreement with one teacher does not survive a change of teacher.

The most useful single thing to tell a school:the behavior they are seeing at 2pm is usually about the environment since 8:30am. What happened immediately before is rarely the whole explanation, and treating it as such produces a plan aimed at the wrong hour of the day.

8 · Autistic adults

Sensory differences do not reduce with age. What changes is that adults usually have more control over their environment and more experience managing it — and considerably less external support.

Common in adulthood:

Avoiding certain venues, forms of transport, or social settings, and being thought antisocial for it
Exhaustion after sensory-demanding days that colleagues found unremarkable
Being seen as difficult for needs that are genuine
Sensory load as a contributor to burnout

9 · Sensory processing and SPD

Sensory processing differences occur in autistic people and in non-autistic people. The two are not the same thing, and the relationship between them is a common source of confusion.

Sensory processing disorder is not a standalone diagnosis in the DSM-5 or the ICD-11. The term is widely used clinically and by families, and the difficulties it describes are real. But a child assessed for SPD alone may not have had autism considered — and the reverse happens too, where sensory processing is not assessed because autism is the presenting question.

Which is why an assessment looking at sensory processing should also look wider, and why it is a fair question to ask what else was considered.

These come up constantly alongside sensory processing, and each has its own page.

MonotropismHow attention is distributed, and why switching between things costs so much. InteroceptionInternal signals — hunger, temperature, emotion — and why they can be hard to read. Autistic burnoutWhere accumulated sensory and social load eventually leads. StimmingSelf-regulation, not a behavior to reduce. Pathological demand avoidanceA described profile, and what it means for how demands are made. Crossing the midlineA motor pattern frequently raised in sensory assessments.

Frequently Asked Questions

Is sensory processing part of autism, or separate?

Since 2022, ICD-11 has included sensory processing differences in the autism diagnostic criteria. It is part of the definition rather than a separate co-occurring issue.

Why is my child sensitive to some things and not others?

Over-responsivity and under-responsivity commonly coexist in the same person, across different senses. It can also shift with tiredness, stress, illness, and how much the day has already demanded.

Do weighted blankets help autistic children?

Research has repeatedly found little or no effect on the outcomes usually claimed for them. Some people find them comfortable, which is a legitimate reason to use one — but comfort is different from a therapeutic effect.

What is the difference between a meltdown and a shutdown?

The same underlying overload, presenting differently. A shutdown is quiet — withdrawal, going still, stopping speaking — and is frequently missed, so the person gets less support rather than more.

Does sensory integration therapy work?

Ayres Sensory Integration — a specific manualized approach delivered by a trained occupational therapist — has moderate-quality evidence for autistic children. Individual sensory-based techniques delivered outside that approach generally have weaker support. Ask any provider which they mean.

My child copes at school and falls apart at home. Why?

Because they spent the day's capacity holding it together. That pattern is common, and it means the environment was demanding — not that home is the problem.

Should sensory differences be assessed separately from autism?

They are part of the autism criteria in both current manuals, so an autism assessment should cover them — but in practice the depth varies a great deal, and assessments carried out under older frameworks frequently did not record them at all. An occupational therapy sensory assessment goes further than most diagnostic appointments do, and it is reasonable to ask for one specifically.

Is sensory processing disorder the same as autism?

No. Sensory processing differences occur in autistic and non-autistic people. SPD is not a standalone diagnosis in the DSM-5 or ICD-11, and someone assessed for sensory difficulties alone may not have had autism considered.

Sources

American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5). APA Publishing; May 2013.
World Health Organization. ICD-11 for Mortality and Morbidity Statistics, 6A02 Autism spectrum disorder. Effective January 2022. Checked August 18, 2026.
Schoen SA, Lane SJ, Mailloux Z, May-Benson T, Parham LD, Smith Roley S, Schaaf RC. A systematic review of Ayres Sensory Integration intervention for children with autism. Autism Research. 2019;12(1):6–19. doi:10.1002/aur.2046 (PMID 30548827)
Acuña C, Gallegos-Berrios S, Barfoot J, Meredith P, et al. Ayres Sensory Integration® with children ages 0 to 12: a systematic review of randomized controlled trials. American Journal of Occupational Therapy. 2025;79(3):7903205180. doi:10.5014/ajot.2025.051023 (PMID 40193295)
Bodison SC, Parham LD. Specific sensory techniques and sensory environmental modifications for children and youth with sensory integration difficulties: a systematic review. American Journal of Occupational Therapy. 2018;72(1):7201190040. doi:10.5014/ajot.2018.029413 (PMID 29280714)

Medical disclaimer. This page is for general educational purposes and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your child. Full disclaimer.

Sensory Processing and Autism