Sensory Differences in Autistic Children: What Research Says and When Occupational Therapy May Help

What “sensory differences” means

Sensory processing describes how the nervous system takes in and responds to touch, sound, sight, taste, smell, movement, and body position. An autistic child may be more sensitive to some kinds of input, less sensitive to others, or seek more of a particular sensation. The DSM-5 includes these responses in the autism criteria, using the terms hyper- or hyporeactivity to sensory input and unusual interest in sensory aspects of the environment. [2]

You may hear researchers and clinicians describe three patterns: over-responsivity (strong reactions to input many people tolerate), under-responsivity (little reaction or being slow to notice), and sensation seeking (strongly seeking certain input). A child can show more than one pattern; these descriptions are not diagnoses. [4]

Understanding a child's response takes more than a sensory label. AAP notes that difficulty tolerating or processing sensory information can appear in several developmental and behavioral conditions. Looking at what happens before and after a behavior, alongside the child's overall development, helps keep other possible contributors in view. [3]

What the research shows about sensory differences

A 2009 meta-analysis by Ben-Sasson and colleagues combined findings from 14 studies. Sensory symptoms were significantly more common or frequent in autistic groups than in typically developing groups. The largest difference was in under-responsivity, followed by over-responsivity and sensation seeking. Differences were largest in children aged 6–9, in samples where more than 80% had an autism diagnosis, and in comparisons with typically developing children of the same age rather than groups matched on mental age or other developmental disabilities. We checked the abstract only. [4]

This older review compared groups of children, so it cannot tell you whether an individual child is autistic. Its findings also depend on how the studies measured sensory symptoms, often through parent reports. AAP notes that commonly used sensory evaluation tools measure parents' perceptions of their child's responses; sensory profiles cannot be used to diagnose autism. [2] [4]

Is “sensory processing disorder” a diagnosis?

The DSM-5 does not include sensory processing disorder as a separate diagnosis, as AAP's 2020 clinical report explains. In its 2012 policy statement, AAP said it was unclear whether sensory-based problems reflect a disorder of the sensory pathways or characteristics of other developmental and behavioral conditions. Because there was no universally accepted diagnostic framework, it advised that sensory processing disorder generally should not be diagnosed. It also called for a thorough evaluation that considers conditions such as autism, ADHD, developmental coordination disorder, and anxiety. [2] [3]

The uncertainty around a diagnosis can be confusing when your child's daily difficulties are very real. Many occupational therapists use sensory frameworks to understand those difficulties. Research has grown since the 2012 AAP statement, although the 2020 AAP report still described evidence for the general use of sensory-based therapies as limited. [2] [3]

What kinds of OT and sensory approaches have been studied?

The term “sensory therapy” can refer to different approaches. Reviews distinguish Ayres Sensory Integration from strategies that provide specific sensory input, and some also examine changes to a child's surroundings:

These categories can help you ask a provider what approach they use; the table cannot tell you which is right for your child. AAP reports that proponents distinguish sensory integration therapy from interventions that simply apply sensory input because the child is actively engaged. Research reviews make this distinction too. [2] [5] [7]

Reviews of Ayres Sensory Integration

A 2019 systematic review in Autism Research by Schoen and colleagues examined ASI studies in autistic children. Of 19 studies evaluated, six met the inclusion criteria. The researchers then excluded three because the interventions did not match ASI or the studies had major methodological flaws. That left two randomized trials involving 69 children altogether, plus one additional study. Using standards from the Council for Exceptional Children, the authors concluded that ASI can be considered an evidence-based practice for autistic children aged 4–12, with results applying only to children with IQ above 65. Some authors also conduct ASI research, including one of the trials rated in the review; they declared no conflict of interest. [5]

A 2025 systematic review by Acuña and colleagues in the American Journal of Occupational Therapy included nine randomized trials with 344 participants. Six trials involved autistic children and three involved other populations. Five trials provided strong evidence for helping autistic children meet individualized goals related to occupational performance, function, and participation. Three trials provided moderate evidence that ASI does not benefit behaviors of concern such as noncompliance or irritability. The authors also noted continuing concerns about bias. We checked the abstract only. [6]

For families, the distinction is in the goal: these findings support ASI for individualized goals such as taking part in dressing, play, or school tasks. They do not support using it to address challenging behavior, and the evidence is more limited for other populations. [6]

A randomized comparison with ABA

In a 2025 trial, Schaaf and colleagues randomly assigned autistic children with sensory differences to OT using ASI, applied behavior analysis (ABA), or no treatment. Each treatment involved 30 one-hour sessions. Both treatment groups made more progress on individualized goals than the no-treatment group, with comparable results between the two treatments. Daily living skills improved in both treatment groups too, but the differences compared with no treatment were not statistically significant. We checked the abstract only; we did not review the sample size or full methods. [8] For more on behavioral approaches, see ABA Therapy for Autism: What the Research Shows and What It Cannot Tell Us.

Sensory-based tools and strategies

A 2025 systematic review by Piller and colleagues in Frontiers in Pediatrics included 21 studies of sensory-based interventions in children and youth aged 0–21 with sensory integration and processing challenges. The review included children beyond the autistic population. It found strong evidence for deep-pressure tactile input and caregiver training in sensory strategies. Moderate evidence suggested that alternative seating did not improve attention and that targeting several sensory systems worked better than targeting one. Evidence on environmental modifications was lacking. The authors noted that interventions were delivered differently across studies and that these approaches have no fidelity measure to check consistency. The American Occupational Therapy Association funded the project, and one author was employed by a child development company. [7]

AAP's 2020 report was more cautious. It described sensory-based therapies as among those caregivers most often request, while noting limited evidence for their general use. At the time, several common interventions, including skin brushing, weighted vests, and therapy-ball seating, were not yet supported in the peer-reviewed literature. The AAP report and newer review examined different evidence at different times and used different methods. Together, they show why it helps to ask about the evidence for the particular approach being offered. [2] [7]

Project AIM: too few high-quality studies for pooling

The 2023 Project AIM update (BMJ) examined controlled studies of non-drug interventions in autistic children younger than 8. It found too few controlled studies of sensory integration therapy, other sensory-based interventions, or music therapy to calculate reliable combined estimates of their effects. That leaves an evidence gap: this dataset could not establish a pooled estimate, which does not demonstrate that the approaches are ineffective. [9]

What the evidence cannot tell us

• Whether your child will benefit. Reviews describe what happened across groups and goals; they cannot predict the outcome for an individual child. [5] [6] [7]
• Which sensory strategy is best. Evidence differs by approach and the studies vary in quality and delivery. [2] [7]
• Whether results from older children apply to toddlers. The ASI review rated studies of children aged 4–12 with IQ above 65. Younger children and those with higher support needs are less represented in the reviews discussed here. [5] [6]
• Whether a sensory label explains a behavior. Behavior can reflect sensory comfort, communication, anxiety, pain, or a mix. A broader assessment matters. [2] [3]
• How strong the evidence is overall. Some reviews were written by researchers connected to the approaches studied or by organizations in the OT field, and reviewers differ in how strictly they judge study quality. Those differences matter when weighing their conclusions. [5] [7]

What you can do now

1. Describe what you see in daily life. Note when and where sensory responses affect meals, sleep, dressing, school, or outings, along with anything that seems to help. These observations give a clinician useful context; they are not a screening test. [2] [3]
2. Ask for a broader assessment. Discuss development, language, movement, attention, and anxiety, including how sensory responses might fit into that picture. Early Signs of Autism in Toddlers and Speech Delay vs. Autism cover related assessment questions; neither article is a diagnostic test. [2] [3]
3. If you are in the U.S., you can request an early intervention evaluation. You do not need a doctor referral. See How to Get Early Intervention Services.
4. Choose goals about participation and comfort. That might mean managing a haircut, joining mealtimes, or getting through a school assembly with support. Reviews measure participation and individualized goals; your child's cues and choices should also help shape those goals. [6] [7] [10]
5. Agree on a review date. AAP suggests discussing a trial period, specific goals, and how you will check whether the therapy is helping. [3]
6. Keep communication supports in place. Children who need support to communicate should continue to have it, whatever sensory approach is being used. See Does AAC Delay Speech?.
7. Know when to act quickly. If a child suddenly changes how they react, seems to be in pain, or loses skills they previously had, contact the pediatrician promptly. This is general safety guidance, not a conclusion from the research above.

Frequently asked questions

The bottom line

Your child's sensory experiences deserve attention as part of their overall development and daily life. Research supports OT using Ayres Sensory Integration for individualized participation goals in autistic children, with limits; evidence for many other sensory tools is mixed or limited. When discussing support, ask what you hope will become easier in your child's day, how their comfort and communication will be respected, and when you will review progress together. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10]