Strategy
Ayres Sensory Integration is a structured occupational therapy intervention developed by A. Jean Ayres in the 1970s. It uses tailored sensory-motor activities (swinging, climbing, tactile play, resistance work) in a controlled clinic environment to improve how the nervous system processes and integrates sensory information. A trained therapist selects activities based on the individual’s responses, targeting sensory modulation, motor planning, and occupational performance. Sessions typically run one to two times per week.
ASI is the most researched sensory intervention in the autism field. Early studies produced disappointing findings, but recent work using proper fidelity measures shows ASI works when delivered with real adherence to its core principles.
When it applies
ASI is most relevant for autistic children aged 4–12 who have specific, individualisable occupational performance goals — things like dressing independently, tolerating mealtimes, participating in classroom activities, or managing transitions. It is delivered in a clinic setting by a specially trained occupational therapist.
It is not a general autism treatment. It does not target social communication, repetitive behaviours, or broader autism traits. Its value is specific: helping individuals achieve functional goals that are impeded by sensory processing differences.
How it works
ASI is not a standardised protocol. The therapist designs each session around the individual’s sensory profile and current goals. Three core principles define the approach:
- Sensory opportunities. The environment offers sensory affordances (swings, textured surfaces, weighted objects, balance equipment), and the individual chooses what to engage with.
- The just-right challenge. Activities are pitched slightly beyond the individual’s current capacity.
- Active participation. The individual directs their own engagement; passive receipt of sensory input is not ASI.
The ASI Fidelity Measure, developed around 2011, defines the structural and process elements that separate genuine ASI from generic sensory-motor activity. Once studies required therapists to demonstrate fidelity, results improved dramatically.
What the evidence shows
Recent evidence (2024–2025) shows stronger results than older reviews. A 2025 systematic review in the American Journal of Occupational Therapy examined nine RCTs totalling 344 participants and found strong evidence that ASI supports autistic children in meeting individualised goals related to occupational performance, function, and participation. A parallel 2025 meta-analysis focused on Chinese populations found positive effects on balance, tactile defensiveness, and proprioception.
A 2025 comparative trial (Schaaf et al., Autism Research) found that ASI and Applied Behaviour Analysis improved individualised goals and daily living skills at comparable rates.
Moderate evidence showed no benefits for behaviours such as noncompliance or irritability. ASI improves functional performance, not how the child appears to observers.
What to watch for
Signs it is working: Progress toward specific, individualised goals. Increased tolerance for previously difficult activities. Reports of improved daily functioning from the individual, family, or carers.
Signs it is not: No measurable progress toward goals after a sustained period (typically 20+ sessions). Increased distress during or after sessions. Goals not being reviewed or adjusted.
Known limitations and failure modes:
- Fidelity. Many therapists claim to deliver ASI without adhering to core principles. Generic sensory activities without individualisation, active participation, or the just-right challenge are not ASI, and the research doesn’t apply.
- Cost and access. ASI requires a trained OT, clinic space, and specialised equipment. It is expensive and inaccessible outside major cities in many regions.
- Age range. Evidence is strongest for children aged 4–12. Evidence for adolescents and adults is limited.
The intellectual disability gap
The intellectual disability population is severely underrepresented in ASI research. Most studies recruit autistic children without co-occurring ID or do not analyse ID separately. Since sensory processing may differ when intellectual disability is present (see Sensory processing in autism and intellectual disability), these findings may not generalise to this population.
The few studies including participants with developmental delays show promise, but dedicated research on ASI for autistic people with intellectual disability remains absent.
Evidence notes
Evidence level: peer-reviewed. The 2025 AJOT systematic review and 2025 meta-analysis represent the current state of the art. Key earlier work includes Schaaf et al.’s RCTs from 2014–2018 that established the importance of fidelity measurement.
The improvement in evidence quality over the past decade is largely attributable to the ASI Fidelity Measure — a reminder that intervention research is only as good as the intervention being researched.