Sensory Integration

A. Jean Ayres and the origin of the theory

A. Jean Ayres (1920-1988) was an occupational therapist and educational psychologist who taught at the University of Southern California. The American Occupational Therapy Association (AOTA) says she developed and tested a theory of sensory integration that she believed was basic to a child's success in daily life activities, and that she created psychometric tests and therapy equipment. USC describes sensory integration as a specialty area of occupational therapy resting on theory and research that began at USC with Ayres.

USC states that her publications on sensory integration span the 1960s through the 1980s and include psychometric studies, clinical trials and single-case studies. AOTA names her 1972 book Sensory Integration and Learning Disorders as widely used, and USC says her standardized tests are today known as the Sensory Integration and Praxis Tests. The two institutional pages do not give a detailed chronology of how the theory was formulated, and her original texts were not opened for this page.

From a clinician's framework to a broader field

A 2009 nursing review states that sensory integration disorders had only begun to be defined over the preceding 35 years and were not included in DSM-IV terminology. It describes three proposed diagnostic groups under the label sensory processing disorder: sensory modulation disorder, sensory discrimination disorder and sensory-based motor disorder. These groups were proposals put forward for testing, not accepted categories.

A 2019 paper by occupational therapy researchers who also wrote reviews of Ayres Sensory Integration describes Ayres Sensory Integration as a framework based on neuroscience principles about how the nervous system turns sensory information into action. The same authors acknowledge limited neuroscience work on dyspraxia and say direct imaging evidence of brain change from the intervention is incomplete.

Ayres Sensory Integration versus sensory-based strategies

Sources use overlapping labels for different things. Lane and colleagues describe Ayres Sensory Integration as a manualized approach built on individualized, multisensory, play-based activities pitched at a just-right challenge, with a validated fidelity measure. A 2015 review separates sensory integration therapy, meaning clinic-based, child-directed, sensory-rich activity, from sensory-based intervention, meaning classroom strategies such as weighted vests or therapy balls that use a single sensory input.

A 2012 American Academy of Pediatrics (AAP) policy statement uses sensory-based therapies for activities that provide vestibular, proprioceptive, auditory and tactile input with brushes, swings and balls. A 2012 systematic review by Lang and colleagues grouped weighted vests, swinging, brushing and joint compression under sensory integration therapy. Later Ayres Sensory Integration reviewers argued that earlier conclusions suffered from conflating these diverse approaches with Ayres intervention delivered to its core principles.

Sensory processing disorder as a construct

The AAP statement says it is unclear whether children with sensory-based problems have a disorder of the brain's sensory pathways or whether the difficulties are features of other conditions. Because it found no universally accepted diagnostic framework, it advises that sensory processing disorder generally should not be diagnosed, and it lists autism spectrum disorders, attention-deficit/hyperactivity disorder, developmental coordination disorder and childhood anxiety among conditions in which sensory difficulties may appear.

A 2017 study of 210 children reports that DSM-5 added over- and under-reactivity to sensory input to the criteria for autism, and that sensory processing disorder is acknowledged in some classification guides but not in DSM-5. In that study, children with autism and children with parent-reported sensory processing disorder differed only on sensory under-reactivity. DSM-5 itself was not opened for this page.

Ayres Sensory Integration sessions

In published trials, the intervention is delivered by occupational therapists in a clinic using a manualized protocol. A 2014 randomized trial in children aged 4 to 8 gave 30 sessions, and a 2025 trial also used 30 one-hour sessions. Lane and colleagues describe activities as active, play-based and tailored to the child at a just-right challenge, such as movement and equipment-based tasks, with treatment adherence checked by a fidelity measure.

A systematic review of Ayres Sensory Integration trials says therapists in the included studies were licensed occupational therapists with advanced Ayres training, and that the number of sessions ranged from 18 to 40 across studies, without an agreed dose. The sources reviewed do not describe a statutory training standard, and this page does not address regulation.

Sensory-based strategies and sensory diets

Classroom and home strategies are usually single techniques. Reviews name weighted vests and therapy balls, swinging, brushing and joint compression. In one 2023 feasibility study from Iran, a sensory diet meant a set of sensory exercises, 105 of them in a smartphone application, which mothers used at home for two months with children who had attention-deficit/hyperactivity disorder. The sources reviewed do not give a standard definition or origin for the term sensory diet.

Populations and goals

The AAP statement describes sensory-based therapies as increasingly used by occupational therapists, and sometimes other therapists, for children with developmental and behavioral disorders. Research on Ayres Sensory Integration has concentrated on autistic children, with goals set around everyday functioning and participation. School-focused reviews and trials also examine sensory strategies for attention and classroom participation.

Mechanisms proposed for specific techniques

Practitioners describe weighted vests and therapy balls as ways to influence a child's state of arousal. Lane and colleagues propose that the vestibular system contributes to arousal, postural control and bilateral coordination. These are explanations offered within the approach, and the authors state that direct evidence of brain change from the intervention is incomplete.

Trials of Ayres Sensory Integration

A 2011 pilot randomized trial compared Ayres-style sensory integration with a fine motor group in children aged 6 to 12 with autism. Goal Attainment Scaling improved in both groups, more in the sensory integration group, and autistic mannerisms decreased in that group; no other result was significant. A 2012 feasibility study of 10 children found the manualized protocol feasible and acceptable, and its authors described it as safe in that small sample.

In a 2014 randomized trial, 17 children who received 30 sessions scored higher on parent-set goals (p = 0.003, d = 1.2) than 15 children receiving usual care, with better caregiver assistance in self-care and socialization. A 17-child Brazilian trial reported similar direction. A 2025 three-arm trial found goal gains in both Ayres Sensory Integration and applied behavior analysis over no treatment, with no significant daily-living gain over no treatment.

Systematic reviews and their conclusions

Reviews reach different conclusions. Lang and colleagues examined 25 studies of sensory integration therapy in autism and found 3 effective, 8 mixed and 14 without benefit, with serious methodological flaws, concluding that the evidence did not support use in education and treatment. Case-Smith and colleagues reviewed 19 studies and reported positive effects in two small randomized trials but few for single-technique strategies, calling for more manualized trials.

A 2018 occupational therapy review of five studies in children with autism rated evidence as strong for individually set goals and moderate for autistic behaviors and caregiver assistance in self-care. A 2019 review applying Council for Exceptional Children standards judged Ayres Sensory Integration an evidence-based practice for ages 4 to 12. Both reviews had authors from Ayres training organizations.

Weighted vests and other single techniques

A review of sensory techniques found limited evidence for weighted vests and insufficient evidence for slow swinging, while a school participation review found low-strength evidence for vests. A single-child study with a five-pound vest found no marked effect on aggression or self-injury. The sources reviewed give no brushing-specific result. A 2023 sensory diet study of 12 children found no significant difference from controls on impulsivity or hyperactivity.

Scope of the evidence

The trials of Ayres Sensory Integration are small and the controlled studies reviewed involve autistic children, so findings should not be carried to children without autism or to other single techniques. Case-Smith and colleagues recommended additional rigorous trials using manualized protocols. Most controls received usual care or another therapy, which limits conclusions about which element of the approach produced any change. The 2011 study was described by its authors as a pilot, meant to establish a model for later trials.

Why reviews disagree

The AAP statement calls the research on effectiveness limited and inconclusive. Disagreement between reviews partly reflects what each counted as sensory integration therapy and which designs it admitted. The studies reviewed also varied in dose, from 18 to 40 sessions, with no definitive guideline, which makes results harder to compare.

Direct harms

The small feasibility study reported no safety problems, and the review abstracts consulted do not describe adverse events from Ayres Sensory Integration, though absence of reporting is not evidence of absence. For weighted vests, one gait study of nine autistic children found shorter right step length across loads of 5 to 20 percent of body mass and no other gait differences. It was not designed as a safety trial.

Indirect harms, time and cost

The AAP statement says other developmental and behavioral disorders must always be considered and a thorough evaluation completed, since a label of sensory processing disorder is not an established framework. It advises that parents be told the research is limited and suggests a trial period with ways to evaluate whether the therapy helps.

The trials reviewed here used 30 clinic sessions, and Lang and colleagues concluded the evidence did not support single-technique sensory integration in autism treatment. None of the sources reviewed quantified costs or insurance coverage, so those are not described here. Sensory approaches should not delay evaluation or other care a clinician considers necessary.