Sensory Integration Therapy for Autism in Ontario

Sensory processing differences are extremely common in autism — the DSM-5 includes hyper- or hypo-reactivity to sensory input as a diagnostic criterion. These differences can manifest as distress from certain sounds, textures, or lights (hypersensitivity), limited response to pain or temperature (hyposensitivity), or an intense drive to seek specific sensory experiences like spinning, jumping, or deep pressure.

These sensory differences can significantly impact daily functioning, learning, and participation. A child who is overwhelmed by classroom noise may struggle to attend to instruction. A child who craves proprioceptive input may be in constant motion. Sensory integration therapy aims to help the nervous system process sensory information more effectively, reducing distress and improving participation in daily activities.

Ayres Sensory Integration (ASI) therapy takes place in a specially equipped clinic with suspension equipment (swings, bolsters), climbing structures, tactile materials, and weighted items. The occupational therapist creates a "just right challenge" — activities that are challenging enough to promote neural adaptation but achievable enough to maintain engagement and build confidence.

Key principles include child-directed activity choice within a structured therapeutic environment, active sensory engagement rather than passive exposure, and targeting the integration of vestibular, proprioceptive, and tactile processing. A fidelity measure developed by Parham et al. (2011) ensures therapy sessions adhere to ASI principles. In Ontario, many pediatric OT clinics offer ASI in purpose-built sensory gyms, while others provide modified sensory strategies within standard clinic spaces.

The evidence base for sensory integration therapy is mixed. A 2019 systematic review by Schoen et al. found that ASI delivered with fidelity showed gains in individualized goals and sensory processing. Results were less consistent for broader outcomes. The 2014 Schaaf et al. randomized trial reported positive results for individualized goals.

Professional groups vary in their stance. Families should separate formal Ayres Sensory Integration therapy from sensory diets or sensory activities. ASI is clinic-based therapy from trained occupational therapists. Sensory strategies are day-to-day supports for regulation.