Who they are
Anna Jean Ayres (1920–1988) was an American occupational therapist and developmental psychologist who created the field of sensory integration. Before Ayres, sensory processing was a basic neuroscience topic. After Ayres, it became a clinical framework with assessment tools, intervention methods, and a theory of how sensory processing differences affect daily function. Every sensory intervention discussed in this wiki — from weighted blankets to Snoezelen to sensory diets — exists downstream of the conceptual territory she opened.
She worked at the University of Southern California, where she developed both the theory and the clinical application over three decades. She was not autistic; she came to sensory processing through occupational therapy’s focus on functional participation.
Key contributions
Sensory Integration Theory
Ayres proposed that the brain’s ability to organise and interpret sensory information from the body and environment is foundational to learning, behaviour, and emotional regulation. When this integration process is disrupted, the result is not primarily a sensory problem but a functional one: difficulty with motor planning, attention, behaviour, and participation in daily life.
Before Ayres, sensory difficulties were understood as perceptual or motor problems. She argued for an integrative layer between sensation and action. Her framework placed occupational therapists at the centre of this work.
Ayres Sensory Integration (ASI) intervention
Ayres developed the clinical intervention that bears her name: structured, therapist-led sessions in sensory-rich environments where the child actively engages with swinging, climbing, tactile play, and resistance activities. The core principles — active participation, the just-right challenge, and therapist-guided but child-directed activity — remain the definition of ASI today. See Ayres Sensory Integration for the current evidence.
Assessment instruments
Ayres developed several assessments, including the Sensory Integration and Praxis Tests (SIPT), which remained the gold standard for clinic-based sensory assessment for decades. Her work also laid the groundwork for later instruments like the Sensory Processing Measure.
Critical assessment
Ayres’ theoretical claims about neural mechanisms were ahead of available neuroscience. Some held up well; others were speculative. The field she created spent decades producing disappointing results, largely because therapists didn’t adhere to her principles. The ASI Fidelity Measure (2011) corrected this, and recent evidence is substantially more positive.
Ayres’ framework predates neurodiversity and frames sensory processing differences as “dysfunction” or “disorder.” Contemporary practice is adopting more affirming language, but the foundational texts retain clinical framing.
The framework does not address interoception — a gap that has become more significant as interoceptive differences have emerged as central to the autistic experience.
Selected works
- Ayres, A.J. (1972). Sensory Integration and Learning Disorders. Los Angeles: Western Psychological Services. — The foundational text.
- Ayres, A.J. (1979). Sensory Integration and the Child. Los Angeles: Western Psychological Services. — The accessible version for parents and educators.
- Ayres, A.J. (1989). Sensory Integration and Praxis Tests. Los Angeles: Western Psychological Services. — The assessment instrument.
Last reviewed
2026-04-15