Understanding Sensory Processing Disorder and Its Impact on Children

What sensory processing actually means

Every waking second, your child's nervous system is fielding an enormous amount of information — the hum of the refrigerator, the seam in a sock, the position of their arms, how full their stomach is. Most of it gets filtered out below the level of awareness so that attention can go to what matters. Sensory processing is that filtering-and-organizing job. When it works smoothly, a child can sit in a busy classroom and attend to the teacher rather than the fluorescent light. When it does not, the light wins.

The clinical framework most often used comes from occupational therapist A. Jean Ayres, who described sensory integration in the 1970s, and was later formalized into a proposed classification distinguishing sensory modulation difficulties, sensory discrimination difficulties and sensory-based motor difficulties.¹ That framework is still the one most therapists work from, and knowing it helps an evaluation report make sense.

This is a spectrum, not a category. Everyone has sensory preferences. The threshold that matters is functional: is this interfering with eating, sleeping, learning, moving or relationships?

A child can be over-responsive in one sense and under-responsive in another. The child who covers their ears at the hand dryer may also be the one who crashes into furniture and does not notice a scraped knee. That is not inconsistency — it is normal within sensory profiles.

Sensory differences are not behavior problems, but they produce behavior. A child who bolts from the cafeteria is not being defiant. They are leaving a place that hurts.

The eight senses, including the three most people have never heard of

Beyond the familiar five, sensory processing includes three hidden senses that do most of the work of keeping a child organized and comfortable in their body.

Two of these deserve their own note. Proprioception explains a great deal of what looks like clumsiness or roughness — a child who cannot feel how hard they are pushing will push too hard.

Interoception is the most overlooked, and the one that causes families the most confusion. A child who cannot reliably read their own internal signals may not know they are hungry until they are melting down, may not recognize the need for the toilet until it is too late, and may struggle to identify what anxious feels like in their body — which makes emotional regulation genuinely harder, not just apparently harder.

The three response patterns

Most of what you will see falls into one of three patterns, and children commonly show more than one across different senses.

Sensory over-responsivity. Ordinary input registers as too much, too fast or too painful. This is the pattern most people picture, and it has the most research behind it. Our full page on sensory over-responsivity goes into detail.

Sensory under-responsivity. Input has to be much stronger than usual before it registers. These children are often described as being in their own world, easygoing or slow to respond — and they are frequently missed, because under-responsivity is quiet and rarely disruptive. More on sensory under-responsivity.

Sensory seeking. The child actively pursues intense input: crashing, spinning, chewing, touching, making noise. This is the pattern most likely to be misread as hyperactivity or misbehavior.

Beyond these modulation patterns, evaluations often also look at sensory discrimination — telling similar inputs apart, like a nickel from a dime in a pocket without looking — and praxis, the planning and sequencing of unfamiliar movements.¹ Both affect handwriting, dressing, playground equipment and the sort of midline coordination covered in our page on crossing the midline.

How common are sensory processing differences?

Genuinely common, though the number depends heavily on how the question is asked.

In children with other diagnoses, rates run much higher. Research using various sensory assessment tools has suggested sensory processing challenges in 50% to 95% of autistic individuals.^6,7 Direct assessment of 82 children referred for neurodevelopmental concerns found 70% of caregivers reported concern about sensory reactions, and 54% showed auditory over-responsivity, tactile over-responsivity or both — a pattern that persisted regardless of whether the child had an autism diagnosis.⁷ That last detail matters: sensory over-responsivity is not specific to autism.

Ben-Sasson's work also found something important for families who have been told to wait it out. In the follow-up of children up to age 8, roughly 16% had sensory symptoms, and about three-quarters of those children had no additional mental health diagnosis.⁸ Sensory difficulty is frequently the only thing going on.

Is sensory processing disorder an official diagnosis?

This is the question parents ask most, and it deserves a direct answer rather than the vague "it is controversial" that most pages offer.

The short version. "Sensory processing disorder" is not a standalone diagnosis in the DSM-5-TR or ICD-11. Sensory processing differences are formally recognized — but as a feature of other conditions rather than as a condition of their own.

What the DSM-5 says. Since 2013, one of the four restricted and repetitive behavior criteria for autism has been "hyper- or hyporeactivity to sensory input or unusual interest in sensory aspects of the environment", with examples including apparent indifference to pain or temperature and adverse response to specific sounds or textures.⁹ The ICD-11 similarly includes sensory hyper- and hypo-sensitivities within the same domain.¹⁰ So sensory reactivity is in the diagnostic manuals. It is attached to autism rather than free-standing.

What the AAP said, and the part almost nobody mentions. In 2012 the American Academy of Pediatrics published a policy statement concluding that because there is no universally accepted framework for diagnosis, sensory processing disorder generally should not be diagnosed; that other developmental and behavioral disorders must always be considered; that occupational therapy using sensory-based therapies may be acceptable as one component of a comprehensive treatment plan; and that parents should be told the research on effectiveness is limited and inconclusive.¹¹

What this means practically:

• A pediatrician may decline to write "SPD" as a diagnosis. That is consistent with existing guidance and is not a dismissal of your child.
• An occupational therapist can still evaluate sensory processing, describe the profile in detail and treat the functional problems, billing against functional codes rather than a sensory diagnosis.
• Insurance coverage is inconsistent for exactly this reason. Our cost and insurance guides cover how families navigate it.
• Because sensory symptoms overlap heavily with other conditions, a proper evaluation should be looking for autism, ADHD, developmental coordination disorder, anxiety, and hearing or vision problems — not stopping at the sensory profile.

A note on language. Many clinicians and most autistic adults prefer "sensory processing differences" over "disorder". We use both here: disorder because that is what parents search for and what many reports say, differences because it is often the more accurate description of what is happening.

How sensory differences overlap with autism, ADHD and anxiety

Autism. Sensory reactivity is a diagnostic criterion,⁹ and the great majority of autistic children show sensory differences.⁶ Related concepts worth understanding include monotropism and autistic burnout, both of which interact with sensory load.

ADHD. Studies have found between 46% and 69% of children with ADHD show symptoms of sensory over-responsivity.¹² If you are trying to work out which is driving what, our comparison of ADHD versus sensory processing disorder walks through the distinguishing features.

Anxiety. This one runs in both directions. In a longitudinal study of autistic toddlers, anxiety and sensory over-responsivity each predicted increases in the other over time.¹³ More recent work identifying five sensory subtypes found the over-responsive group had distinctively elevated anxiety, while seeking and under-responsive groups showed elevated ADHD scores; all three atypical groups showed elevated emotion dysregulation, which the authors suggested may be a shared mechanism.¹⁴ Our article on when sensory issues and anxiety overlap covers telling them apart in practice. The practical takeaway: if your child has a sensory profile and an anxiety picture, treating only one of them tends to stall.

What the brain research actually shows

The imaging work is real, genuinely interesting, and smaller than headlines suggest. Using diffusion tensor imaging in 16 boys aged 8 to 11 with sensory processing differences and 24 matched neurotypical controls, researchers found reduced white matter integrity primarily in posterior tracts — the posterior corpus callosum, posterior corona radiata and posterior thalamic radiations — correlating strongly with auditory, multisensory and inattention scores.⁴ A later study of 44 children against 41 typically developing children replicated the posterior finding, with reduced track density in the splenium the single variable independently distinguishing the groups.¹⁵ A 2024 review concluded the literature confirms impaired integrity of specific tracts and establishes correlations with the associated neurobehavioral findings.¹⁶

Related work comparing autistic children and children with sensory processing differences found shared white matter disruption in sensory pathways but divergent connectivity in social-emotional pathways.¹⁷ That is the most interesting finding in the field, because it suggests the two groups are not simply the same thing at different severities.

What sensory differences look like at each age

Babies, birth to 12 months

The earliest signs are usually about regulation rather than sensation as such: a baby who cannot settle, who startles dramatically, who resists being put down or resists being held, who arches away from certain fabrics, or who is unusually still and hard to rouse. Feeding difficulty and extreme reactions to bathing and diaper changes are common. Our baby development pages cover what is typical, and our guide to managing overstimulation covers practical approaches. Be careful here: much of this overlaps with ordinary infant temperament. What raises the question is intensity, persistence, and whether it is interfering with feeding, sleep or your ability to soothe.

Toddlers, one to three years

Dressing, haircuts, nail cutting, tooth brushing and shoes become daily flashpoints, and food range may narrow sharply. An over-responsive toddler may melt down at textures, sounds or transitions; an under-responsive toddler may seem disengaged, or may pose genuine safety risks because they do not register pain, heat or height. Sensory seeking often looks like relentless motion. At this age it is hard to separate sensory difficulty from ordinary toddler autonomy battles, and the distinguishing feature is usually consistency: a child who sometimes refuses the coat is negotiating; a child who always refuses that specific coat and is fine in a different fabric is telling you something about texture. See our toddler development pages for context.

Preschoolers, three to five years

Group settings raise the demand sharply. Circle time, shared messy play, the noise of a full classroom and the requirement to sit still all press on exactly the systems that are struggling. Children may hover at the edge of play rather than joining, or join too physically and be labeled rough. This is also the age where sensory difficulty starts to have social consequences, which is a large part of why early support matters. Our preschool development pages cover expected skills.

School-aged children

The classroom is a sensory environment first and a learning environment second — fluorescent lights, chair scrapes, hallway noise, the smell of the cafeteria, twenty-five other bodies. A child using most of their capacity to tolerate the room has less left for the lesson. Common presentations: fatigue that arrives at three o'clock as a meltdown after a day of holding it together, avoidance of PE or the lunchroom, handwriting difficulty, being described as inattentive, and a growing gap between apparent ability and output. Self-esteem starts to take real damage around this age, because children begin to notice that things other people find easy are hard for them.

Adolescents

Sensory differences do not disappear at puberty; they get better hidden. Teenagers may withdraw from social settings framed as not being into it, avoid certain venues, or manage load by staying in their room. Some seek intense input in ways that carry more risk than a preschooler's crash-and-jump. The useful work shifts from accommodating a child to helping a young person understand and articulate their own profile. Sensory needs persist into adulthood — our adult neurodivergence section covers what that looks like later on.

Sensory overload and meltdowns, and how a meltdown differs from a tantrum

Sensory overload happens when incoming input exceeds what the nervous system can organize. The result is not a decision; it is a stress response. It shows up as irritability, anxiety, shutting down or withdrawing, covering ears or eyes, fleeing, and meltdowns.

Two things follow. First, consequences do not work on meltdowns, because a meltdown is not a choice. Second, the trigger is frequently not the last thing that happened — it is the accumulation across the whole day. That is why so many children hold it together at school and fall apart in the car.

Shutdown is the quieter version, and it is often missed entirely: the child goes still, stops speaking and disengages. It is the same overload expressed differently, and it needs the same response. For more, see sensory overload and coping strategies and sensory overload in children.

Where sensory differences show up in daily life

Eating

Restricted eating is one of the most common presentations, and it is usually about texture, smell and appearance rather than taste. Where restriction becomes severe enough to affect growth, nutrition or family functioning, it may meet criteria for avoidant/restrictive food intake disorder, which is a formal diagnosis and worth raising with your pediatrician. Ordinary picky eating resolves; sensory-driven food restriction usually needs support. Our page on oral motor development for speech and feeding covers the mechanical side.

Sleep

Sensory over-responsivity has been associated with sleep problems and gastrointestinal problems as part of the broader functional impairment picture.⁵ Bedding textures, ambient noise, light and difficulty settling after the day all contribute. The loop is unforgiving: poor sleep reduces sensory tolerance, and reduced tolerance worsens sleep.

Motor skills and play

Children who avoid the playground avoid the input that builds balance, coordination and motor planning, and over time that avoidance can produce a real motor skills gap that has nothing to do with underlying ability. Where coordination is significantly affected, developmental coordination disorder should be considered — it is a formal diagnosis with its own pathway, and it is frequently missed in children carrying a sensory label. Our physical therapy for infants and toddlers page covers early motor support.

Learning and school

Sensory load competes directly with attention. A child filtering hard is not available to learn, and the resulting picture looks like inattention, avoidance or laziness. This is where accurate identification matters most, because the response to "will not" and the response to "cannot tolerate the room" are completely different.

How to get an evaluation

The pathway, in the order that actually works.

1. Document before you call. For two weeks, note what happened, where, what preceded it, and how long recovery took. Patterns emerge on paper that are invisible in the moment, and clinicians can do far more with a log than with a summary.
2. Start with your pediatrician. Ask specifically for a developmental screening and referrals. Ask for hearing and vision to be checked too — a child who does not respond to their name may have fluid in their ears rather than an auditory processing difference, and this gets missed with some regularity.
3. Request an occupational therapy evaluation. An OT will typically use a standardized parent questionnaire, direct observation of movement, motor planning and responses to input, and a functional interview about daily routines. You can find a pediatric occupational therapist through our directory or browse providers by state.
4. Ask for the differential to be considered. Given the overlap, a good evaluation looks for autism, ADHD, developmental coordination disorder, anxiety, language disorder and sensory-related feeding difficulty. If the assessment stops at "sensory", ask what else was ruled out.
5. Add other disciplines where indicated. A physical therapist for balance, coordination and gross motor concerns; a speech-language pathologist where communication or feeding is affected.

Questions worth asking any prospective therapist:

• What functional goals will we work toward, and how will we measure them?
• Do you use Ayres Sensory Integration with the Fidelity Measure, or a different approach?
• How do you involve me, and what does this look like at home?
• How long before we should expect to see change, and what happens if we do not?

What the evidence supports, and what it does not

This is where most sensory content is weakest — recommending tools without saying what is behind them. Here is the picture, ordered by strength of evidence.

Strongest: environmental accommodation

Reducing unnecessary sensory load costs nothing, carries no risk and works immediately. Dimmer lighting, quieter routes, arriving before the crowd, seating away from the door, permission to leave, removing the tag rather than debating the tag. It is not glamorous and it is not a therapy, but it is the most reliably useful thing available.

Good but conditional: Ayres Sensory Integration under fidelity

Ayres Sensory Integration is a specific, manualized approach with a published Fidelity Measure — not a synonym for "sensory activities". A systematic review applying Council for Exceptional Children standards concluded that on those criteria it can be considered an evidence-based practice for autistic children aged 4 to 12, with two randomized controlled trials meeting 100% and 85% of the quality items.¹⁸ A more recent review restricted to randomized trials using the Fidelity Measure found that under fidelity, autistic children improved significantly on individualized goals for occupational performance, function and participation — while research on behaviors of concern such as noncompliance or irritability indicated no benefit.¹⁹

A 2026 review of interventions adhering to the revised Fidelity Measure was more cautious still, concluding the level of evidence for a positive effect is currently limited and that higher-quality research with appropriate blinding and objectively described procedures is needed.²⁰ Both positions are defensible. The reasonable summary: promising, delivered properly, with functional goals, monitored.

Weak or unsupported: specific sensory-based tools

Weighted vests. A systematic review concluded the evidence does not support their use for autistic children, citing limited use of rigorous designs and results that do not indicate positive outcomes.²¹ Among seven single-subject studies applying a weighted vest, only one demonstrated positive effects.²²

Brushing protocols. The Wilbarger protocol has even less evidence behind it than weighted vests, with the available studies indicating it is ineffective for the behaviors it is used to target.²³

Weighted blankets. In a randomized placebo-controlled crossover trial of autistic children with severe sleep problems, weighted blankets did not increase total sleep time, speed sleep onset or reduce night waking against an identical control blanket — though children and parents preferred them and they were well tolerated.²⁴ Our weighted blanket safety guide covers age and weight guidance.

Focal sensory-based interventions generally. Reviews separating comprehensive sensory integration therapy from focal sensory-based treatments have found no support for the focal treatments and low-to-moderate support for the integration approaches.²²

Unknown but plausible: sensory diets

A sensory diet — a scheduled program of individualized sensory input across the day — is standard occupational therapy practice and makes theoretical sense. It also has thin direct evidence, largely because it is individualized by design and therefore hard to trial. Reasonable to use with a therapist, with defined goals and a review date. Not something to buy as a downloadable program.

School supports, and what you can ask for

Sensory needs are accommodatable, and you do not need an SPD diagnosis to get accommodations — you need documented functional impact. Section 504 plans cover accommodations where a condition substantially limits a major life activity. IEPs cover specialized instruction and related services, and occupational therapy can be a related service where it is needed for a child to access education.

Accommodations that are usually straightforward to get and genuinely help:

• Preferential seating away from doors, windows, air vents and high-traffic routes
• Permission to leave the room to a designated quiet space, without having to ask each time
• Noise-reducing headphones or earplugs for assemblies, the cafeteria and fire drills
• Advance warning of fire alarms where possible
• An alternative lunch location
• Movement breaks scheduled proactively rather than as a response to dysregulation
• Alternatives to messy activities, or tools instead of hands
• Reduced handwriting demand, or typing
• Advance notice of schedule changes

Our resources for teachers section has material you can share directly with school staff, and our free downloadable guides include material designed for handing over at meetings.

What parents can do at home

Find the pattern before you find the solution. Two weeks of notes will tell you whether the problem is the cafeteria, the transition, or the accumulated day.

Reduce the load you can control. You cannot change the school's lighting. You can change what happens in the twenty minutes after pickup.

Build in recovery rather than waiting for collapse. A child who needs decompression after school should get it scheduled, not earned after a meltdown.

Prepare for transitions. Advance warning, predictable routines and knowing what comes next reduce load substantially. Our page on routine and sensory processing covers this in depth.

Do not suppress self-regulation. If your child rocks, hums, chews or paces to stay regulated, that is a solution, not a symptom.

Give them the language. "That is too loud for me" is a skill, and one of the more valuable things a sensory-sensitive child can leave childhood with. It requires that they have been believed when they said it.

Watch your own load. Parenting a child with significant sensory needs is genuinely draining, and parent burnout degrades everyone's capacity. That counts as part of the plan, not a distraction from it.

When to seek help

Book an evaluation when sensory differences are:

• Limiting food to the point of nutritional or growth concern
• Preventing sleep consistently
• Interfering with school — learning, attending, or staying in the classroom
• Shrinking your child's world — declining invitations, avoiding places, losing activities they used to enjoy
• Producing daily meltdowns or shutdowns
• Causing safety concerns — bolting, not registering pain or danger
• Affecting self-esteem — a child describing themselves as bad, weird or broken
• Not improving with the accommodations you have already made

You do not need to wait for things to get worse to justify an evaluation. An assessment that finds nothing significant is a good outcome, not a wasted appointment. Find a pediatric OT, PT or speech therapist near you.

Popular next reads

• Sensory processing disorder: the complete guide
• Sensory over-responsivity explained
• Interoception: the sense that tells us how we feel inside
• Understanding sensory overload and coping strategies
• ADHD or sensory processing disorder? Key differences

Frequently Asked Questions

What is sensory processing disorder in children?

It describes difficulty taking in, organizing and responding to sensory information in a way that supports everyday functioning. It spans over-responsivity, where input feels too intense; under-responsivity, where input barely registers; and sensory seeking, where a child actively pursues intense input. It can affect any of the eight senses, including the less familiar vestibular, proprioceptive and interoceptive systems.

Is sensory processing disorder a real diagnosis?

Sensory differences are real and measurable; "sensory processing disorder" as a standalone label is not in the DSM-5-TR or ICD-11. Sensory hyper- or hyporeactivity is one of the diagnostic criteria for autism,⁹ and the ICD-11 places sensory hyper- and hypo-sensitivities in the same domain.¹⁰ A 2012 AAP policy statement advised that sensory processing disorder generally should not be diagnosed, because there is no universally accepted framework, and that other conditions must always be considered.¹¹ AAP policy statements expire five years after publication unless reaffirmed, and none has been issued since.^11,12

How common are sensory processing differences?

Depends how the question is asked. In a representative sample of 925 children aged 7 to 11, 16% of parents reported at least four tactile or auditory sensations that bothered their child.³ An earlier kindergarten survey put the community estimate near 5%.² The neuroimaging literature commonly quotes 5 to 16% of school-aged children.⁴

What is the difference between a tantrum and a sensory meltdown?

A tantrum is goal-directed: the child wants something, usually checks whether anyone is watching, and it typically stops when the goal is met. A meltdown is a stress response, not a choice. It does not depend on an audience, often does not stop when you give in, frequently follows accumulated load rather than one trigger, and is followed by exhaustion. Consequences do not work on a meltdown, because there is no decision to influence.

Do weighted vests help children with sensory differences?

The evidence does not support them. A systematic review concluded the evidence does not support weighted vests for autistic children,²¹ and among seven single-subject studies of weighted vests, only one showed positive effects.²² They are not harmful in ordinary use, so if your child likes one, that preference is real — but it is a comfort item rather than a treatment.

Do weighted blankets help sensory children sleep?

Not on the objective measures. In a randomized placebo-controlled crossover trial of autistic children with severe sleep problems, weighted blankets did not increase total sleep time, speed sleep onset or reduce night waking against an identical control blanket, and there were no group differences on any other outcome. Children and parents did prefer them and they were well tolerated.²⁴

Does sensory integration therapy work?

It depends what is being asked of it, and the distinction is worth holding onto. Ayres Sensory Integration is a specific manualized approach with a published Fidelity Measure, not a synonym for sensory activities. A review applying Council for Exceptional Children standards found it can be considered an evidence-based practice for autistic children aged 4 to 12.¹⁸ A review restricted to randomized trials using the Fidelity Measure found that under fidelity, children improved on individualized functional goals — while research on behaviors of concern showed no benefit.¹⁹ A 2026 review was more cautious still, calling the evidence limited.²⁰

What is a sensory diet, and is there evidence for it?

A scheduled program of individualized sensory input across the day. It is standard occupational therapy practice and makes theoretical sense, but it has thin direct evidence, largely because it is individualized by design and therefore hard to trial. Reasonable to use with a therapist, with defined goals and a review date. Not something to buy as a downloadable program.

Can a child be over-responsive to one sense and under-responsive to another?

Yes, and it is common rather than contradictory. The child who covers their ears at the hand dryer may also crash into furniture and not notice a scraped knee. Evaluations describe a profile across the senses rather than a single setting.

How do sensory differences relate to autism and ADHD?

Sensory reactivity is a diagnostic criterion for autism,⁹ and research tools have put sensory processing challenges in autistic individuals somewhere between 50% and 95%.^6,7 In ADHD, studies have found 46% to 69% of children show sensory over-responsivity.¹² But direct assessment of 82 children referred for neurodevelopmental concerns found over-responsivity persisted regardless of whether the child had an autism diagnosis⁷ — so it is not specific to any one condition.

Is sensory processing difficulty linked to anxiety?

In both directions. In autistic toddlers, anxiety and sensory over-responsivity each predicted increases in the other over time.¹³ Work identifying five sensory subtypes found the over-responsive group had distinctively elevated anxiety, and all three atypical groups showed elevated emotion dysregulation.¹⁴ Treating only one of the two tends to stall.

Is there a brain scan that diagnoses sensory processing disorder?

No, and any clinic offering one should be treated with suspicion. Imaging studies have found reduced white matter integrity in posterior sensory tracts that correlates with sensory behavior,^4,15 and a 2024 review confirms the pattern.¹⁶ But these are small samples, mostly boys, largely from one research group. What the work supports is that this is a neurological difference rather than a behavioral choice.

Do we need a diagnosis to get school accommodations?

No. A 504 plan covers accommodations where a condition substantially limits a major life activity, and an IEP covers specialized instruction and related services. What is needed is documented functional impact, not a particular label.

Should we stop a child from stimming?

Usually not. Rocking, flapping, humming and pacing are very often a child's own effective regulation strategy, and suppressing them generally costs more than it saves. The exception is anything unsafe, which is worth working on with a therapist rather than simply blocking.

Sources

1. Miller LJ, Anzalone ME, Lane SJ, Cermak SA, Osten ET. Concept evolution in sensory integration: a proposed nosology for diagnosis. American Journal of Occupational Therapy. 2007;61(2):135–140. Proposes the classification into sensory modulation disorder, sensory-based motor disorder and sensory discrimination disorder that most evaluation reports still follow.
2. Ahn RR, Miller LJ, Milberger S, McIntosh DN. Prevalence of parents’ perceptions of sensory processing disorders among kindergarten children. American Journal of Occupational Therapy. 2004;58(3):287–293. 13% of responding kindergarten parents reported significant sensory challenges; adjusted for the low response rate, the community estimate was about 5%.
3. Ben-Sasson A, Carter AS, Briggs-Gowan MJ. Sensory over-responsivity in elementary school: prevalence and social-emotional correlates. Journal of Abnormal Child Psychology. 2009;37(5):705–716. A representative sample of 925 children aged 7 to 11, followed from infancy; 16% of parents reported at least four tactile or auditory sensations that bothered their child. The paper also notes higher prevalence in clinical populations, including around 69% in ADHD samples.
4. Owen JP, Marco EJ, Desai S, et al. Abnormal white matter microstructure in children with sensory processing disorders. NeuroImage: Clinical. 2013;2:844–853. Diffusion tensor imaging in 16 boys aged 8 to 11 against 24 matched neurotypical controls, finding reduced white matter integrity primarily in posterior tracts, correlating with auditory, multisensory and inattention scores. The paper is also the origin of the widely quoted "5 to 16% of school-aged children".
5. Replicable, transdiagnostic behavioral and neural correlates of sensory overresponsivity. bioRxiv, 2025. Estimates sensory over-responsivity at roughly 15 to 20% of children, with associated psychiatric problems and functional impairment including sleep and gastrointestinal problems. A preprint, so not yet peer reviewed, and read as an indication rather than a settled figure.
6. Leekam SR, Nieto C, Libby SJ, Wing L, Gould J. Describing the sensory abnormalities of children and adults with autism. Journal of Autism and Developmental Disorders. 2007;37(5):894–910. One of the studies behind the 50% to 95% range. Using a detailed diagnostic interview, over 90% of autistic children showed sensory abnormalities, across multiple sensory domains, and a second study confirmed the pattern was pervasive, multimodal and persistent across age and ability.
7. Brief Report: Characterization of Sensory Over-Responsivity in a Broad Neurodevelopmental Concern Cohort Using the Sensory Processing Three Dimensions (SP3D) Assessment. Journal of Autism and Developmental Disorders. 2022. 82 children referred for neurodevelopmental concerns. 70% of caregivers reported concern about sensory reactions; direct assessment found 54% with auditory over-responsivity, tactile over-responsivity or both, persisting regardless of an autism diagnosis. Auditory over-responsivity was more than twice as prevalent as tactile.
8. Miller LJ, Schoen SA, et al. Editorial: Sensory processing across the lifespan. Frontiers in Integrative Neuroscience. 2021. Summarizing the Ben-Sasson and Carter New Haven birth cohort: in children up to age 8, 16% had symptoms of sensory processing difficulty, and about three-quarters of those had no additional mental health diagnosis.
9. American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, 2013; text revision 2022. Autism criterion B4 is "hyper- or hyporeactivity to sensory input or unusual interest in sensory aspects of the environment", with examples including apparent indifference to pain or temperature and adverse response to specific sounds or textures. As reproduced by the CDC.
10. World Health Organization, ICD-11 for Mortality and Morbidity Statistics, as described in Autism Spectrum Disorder and auditory sensory alterations: a systematic review. Journal of Neural Transmission. 2023. The DSM-5 and, more recently, the ICD-11 include sensory hyper- and hypo-sensitivities within the restricted and repetitive behavior domain.
11. Zimmer M, Desch L, Rosen LD, et al. Sensory Integration Therapies for Children With Developmental and Behavioral Disorders. Pediatrics. 2012;129(6):1186–1189. The policy statement quoted on this page: "Because there is no universally accepted framework for diagnosis, sensory processing disorder generally should not be diagnosed." It also says sensory-based occupational therapy may be acceptable as one part of a comprehensive plan, and that parents should be told the research is limited and inconclusive. It carries the standard AAP notice that policy statements expire five years after publication unless reaffirmed, revised or retired.
12. New Research in Sensory Processing Dysfunction. CHADD, ADHD Weekly. Notes that studies have found 46% to 69% of children with ADHD show symptoms of sensory over-responsivity, that the DSM-5 does not describe sensory processing dysfunction as a separate disorder, and that no further AAP policy statement on the topic has been issued since 2012.
13. Green SA, Ben-Sasson A, Soto TW, Carter AS. Anxiety and sensory over-responsivity in toddlers with autism spectrum disorders: bidirectional effects across time. Journal of Autism and Developmental Disorders. 2012;42(6):1112–1119. Each predicted increases in the other over time.
14. Brandes-Aitken A, Powers R, Wren J, et al. Sensory processing subtypes relate to distinct emotional and behavioral phenotypes in a mixed neurodevelopmental cohort. Scientific Reports. 2024;14:29326. Five sensory subtypes. The over-responsive group showed distinctively elevated anxiety; seeking and under-responsive groups showed elevated ADHD scores; all three atypical groups showed elevated emotion dysregulation.
15. Payabvash S, Palacios EM, Owen JP, et al. Diffusion tensor tractography in children with sensory processing disorder. NeuroImage: Clinical. 2019;23:101831. 44 children with sensory processing differences against 41 typically developing children, with reduced measures predominantly in posterior tracts; average track density in the splenium was the only variable independently distinguishing the groups.
16. Jang WH, Lee SH. Diffusion tensor imaging of the brain in children with sensory processing disorder: a review. Journal of Neuroimaging. 2024;34(2):167–178. Confirms impaired integrity of specific white matter tracts and correlations between imaging measures and the associated neurobehavioral findings.
17. Chang YS, Owen JP, Desai SS, et al. Autism and sensory processing disorders: shared white matter disruption in sensory pathways but divergent connectivity in social-emotional pathways. PLOS ONE. 2014;9(7):e103038.
18. Schoen SA, Lane SJ, Mailloux Z, et al. A systematic review of Ayres Sensory Integration intervention for children with autism. Autism Research. 2019;12(1):6–19. Three studies met strict inclusion criteria; two randomized controlled trials met 100% and 85% of Council for Exceptional Children quality items. On those criteria, ASI can be considered an evidence-based practice for autistic children aged 4 to 12.
19. Acuña C, Gallegos-Berrios S, Barfoot J, Meredith P, Hill J. 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. Restricted to randomized trials using the ASI Fidelity Measure. Under fidelity, autistic children improved significantly on individualized goals for occupational performance, function and participation; research on behaviors of concern such as noncompliance or irritability indicated no benefit.
20. Efficacy of Interventions Adhering to the Revised Ayres Sensory Integration® Fidelity Measure: A Systematic Review. Journal of Autism and Developmental Disorders. 2026. Concludes the level of evidence for a positive effect is currently limited, and that higher-quality research with appropriate blinding, objectively described procedures and measured procedural fidelity is required. The more cautious of the two recent reviews, and quoted here alongside rather than instead of the other.
21. Watling R, Hauer S. Effectiveness of Ayres Sensory Integration® and sensory-based interventions for people with autism spectrum disorder: a systematic review. American Journal of Occupational Therapy. 2015;69(5). Concluded the evidence does not support weighted vests for autistic children, citing limited use of rigorous designs and results that do not indicate positive outcomes.
22. Case-Smith J, Weaver LL, Fristad MA. A systematic review of sensory processing interventions for children with autism spectrum disorders. Autism. 2015;19(2):133–148. Among seven single-subject studies of weighted vests, only one showed positive effects. The review separates comprehensive sensory integration therapy from focal sensory-based treatments, finding no support for the focal treatments and low-to-moderate support for the integration approaches.
23. Treatment summary: Wilbarger Brushing Protocol. Association for Science in Autism Treatment. Summarizes the available studies as indicating the procedure is ineffective for the behaviors it is used to target, with less evidence behind it than weighted vests.
24. Gringras P, Green D, Wright B, et al. Weighted Blankets and Sleep in Autistic Children — A Randomized Controlled Trial. Pediatrics. 2014;134(2):298–306. Against an identical control blanket the weighted blanket did not increase total sleep time by actigraphy, with no group differences on any other objective or subjective measure. Children and parents did prefer it and it was well tolerated.

Medical disclaimer. This page is for general educational purposes and does not constitute medical advice, diagnosis, or treatment. It is not a substitute for evaluation by a qualified clinician who knows your child.