Sensory Processing Measure

The SPM is a validated caregiver/teacher-rated tool assessing sensory processing across eight domains in children and adolescents. T-score ≥70 indicates definite dysfunction. Miller-Kuhaneck et al. (2007).

What is the Sensory Processing Measure?

The Sensory Processing Measure (SPM) is a standardized, norm-referenced caregiver and teacher rating scale developed by Miller-Kuhaneck, Henry, and Glennon (2007) to assess sensory processing abilities and related social participation in children ages 5–12. The companion SPM-P (Preschool) covers ages 2–5, and the SPM-2 (2019 revision, WPS) is an updated edition with age-banded forms spanning from infancy through adulthood.

The SPM is designed to be completed by both caregivers/parents (Home Form) and teachers (Main Classroom Form) to capture sensory processing differences across environments. It assesses how the brain interprets and organizes sensory information from the environment and from the body, identifying patterns consistent with sensory over-responsivity, under-responsivity, and sensory seeking.

Scores are converted to age-normed T-scores (mean=50, SD=10). T-scores of 60–69 indicate some problems with sensory processing; T-scores ≥70 indicate definite dysfunction requiring further evaluation and intervention planning. The SPM is widely used by occupational therapists, school psychologists, and developmental pediatricians as part of autism, ADHD, and sensory integration evaluations.

SPM T-Score Interpretation

SPM raw item responses are converted to age-normed T-scores (mean=50, SD=10). Each of the eight scales produces its own independent T-score; there is no single summed total raw score. The bands below represent the standard clinical convention established in the SPM manual.

Because each scale is interpreted independently, a child may show typical performance on some scales and definite dysfunction on others. This profile approach is one of the SPM's key clinical strengths — it directs intervention planning to the specific sensory systems most affecting daily function.

In the initial development study, the SPM-School correctly classified 92.3% of typically developing children and 72.0% of children with identified sensory issues, with internal consistency (Cronbach's α) ranging from .93 to .99 in the first pilot study and .70 to .99 in the second pilot study (Miller-Kuhaneck et al., 2007, PMID 17436839). These figures are from early pilot data; the manual reports separate normative statistics from the full standardization sample.

SPM Eight Scales

The SPM measures sensory processing and related functions across eight scales. Each scale produces an independent T-score; the Total Sensory Systems score provides an overall summary.

Note that the SPM uses consumer-friendly scale labels (Body Awareness, Balance & Motion, Planning & Ideas) rather than the corresponding neurological terms (proprioception, vestibular, praxis). Clinicians reporting results should clarify which underlying sensory system each label represents.

Sensory Patterns & What They Mean

The SPM identifies three response patterns that can co-exist within the same individual, even within the same sensory system.

Sensory over-responsivity means the nervous system reacts more strongly or quickly than typical to a given input level. A child who is over-responsive to touch may resist clothing tags, avoid being touched, or become dysregulated during routine grooming.

Sensory under-responsivity means the nervous system fails to register or respond to sensory input at the level typical peers do. An under-responsive child may appear inattentive, seem unaware of injuries, or require intense input to produce a reaction.

Sensory seeking describes an active, motivated drive to obtain more sensory input — the child actively crashes into furniture, touches everything, or seeks spinning and swinging. Unlike under-responsivity, seeking is a behavioural strategy rather than simply a registration failure.

These three patterns are not mutually exclusive; a child may show over-responsivity in one sensory system while seeking input in another. Importantly, an elevated T-score on any single SPM scale does not on its own identify which pattern is present — over-responsivity, under-responsivity, and seeking can each contribute to a high score. The specific response pattern is identified through examination of the individual item-level responses and clinical observation. Identifying the pattern within each domain guides intervention: sensory integration therapy, environmental modification, and sensory diet strategies differ meaningfully depending on whether the primary pattern is over-responsivity, under-responsivity, or seeking.

SPM Versions Overview

The SPM family has expanded since the 2007 original to cover the full developmental lifespan. The table below summarizes the main versions available from Western Psychological Services (WPS).

The SPM-P was developed alongside the original SPM and shares the same publisher and T-score framework. The SPM-2 (2019) is a comprehensive revision by Western Psychological Services that maintains backward conceptual compatibility with the original SPM while providing updated normative data and forms covering ages outside the original 5–12 range. Clinicians should specify which version was used when reporting results, as norms differ across editions.

Cross-cultural adaptations of the SPM have been studied in multiple languages. A Hong Kong Chinese version (SPM-HKC) demonstrated acceptable reliability and validity in a sample of 547 typically developing children and 140 children with autism spectrum conditions, supporting cross-cultural use while recommending culture-specific norms (Lai et al., 2011, PMID 21752596).

Sensory & Developmental Outcome Tracking

The SPM is often used alongside complementary standardized instruments when monitoring sensory and developmental outcomes across settings. Common pairings include the CARS-2 for autism severity, the Vineland Adaptive Behavior Scales for adaptive function, and the Conners or Vanderbilt assessments for attention difficulties. Using a consistent battery across re-assessment points allows clinicians to detect change in specific sensory domains while also tracking broader developmental and behavioural outcomes — supporting measurement-based care for pediatric, ASD, and school-based programmes.