Who they are
Winnie Dunn is the most influential living figure in sensory processing research. She is a Distinguished Professor Emerita of Occupational Therapy, with a career spanning four decades of research into how people process sensory information and how those processing patterns affect daily life. Her theoretical model — the Dunn Sensory Processing Framework — is the conceptual foundation of the most widely used sensory assessment instruments in the world, and it is the framework on which the Dutch prikkelbalans, prikkelprofiel, and prikkeltaal approaches are built.
She is not autistic, or at least has not publicly identified as such. Her work is clinical and empirical. Her framework has shaped how practitioners think about sensory processing differences more than any other single contribution.
Key contributions
The Dunn Sensory Processing Framework
Dunn’s central insight, articulated across a series of publications from the mid-1990s onward, is that sensory processing varies along two independent dimensions:
Neurological threshold — how much sensory input the nervous system needs before it responds. High threshold: the system needs a lot of input to register it. Low threshold: the system responds to very little input.
Behavioural response — what the person does about their threshold. Passive: the person lets things happen and responds to whatever reaches their threshold. Active: the person takes deliberate action to manage their sensory environment.
These two axes produce four patterns: the Observer (high threshold, passive — misses input, doesn’t seek it), the Seeker (high threshold, active — hunts for more stimulation), the Sensor (low threshold, passive — notices everything, can’t filter), and the Avoider (low threshold, active — actively reduces input). See Dunn’s four types of sensory processing for the full treatment.
This framework treats sensory processing as a characteristic, not a symptom. Everyone falls somewhere on these two axes, not just autistic or neurodivergent people. The framework normalises variation while providing a vocabulary for understanding when variation creates difficulty — which is exactly the approach this wiki adopts.
The Sensory Profile instruments
Dunn translated her framework into the Sensory Profile family of standardised assessments — the most widely used sensory processing instruments globally. The Sensory Profile 2 (SP-2) covers infancy through childhood; the Adolescent/Adult Sensory Profile (A/ASP) extends the range. Together, they have been used in thousands of research studies and clinical assessments. See Dunn Sensory Profiles for the wiki’s assessment tool page.
Sensory processing as a lifespan characteristic
Dunn’s work frames sensory processing patterns as enduring characteristics of the nervous system—stable features of how a brain is wired, not developmental stages to outgrow or disorders to treat. This framing is compatible with the neurodiversity paradigm, though Dunn herself works within a clinical rather than an activist framework.
Critical assessment
Dunn’s model is a top-down theoretical framework that starts from two proposed axes and maps observations onto them. It’s not derived from bottom-up neurobiological data. The framework has strong face validity and good psychometric properties, but the underlying neurological mechanisms—threshold and regulation—simplify what are likely more complex processes.
The Sensory Profile instruments lack interoception assessment — a significant omission given the growing evidence for interoceptive differences in autism. See Interoception in autism.
No formally validated Dutch version of the Sensory Profile exists, which is a practical barrier for Dutch practice. See the Dutch validation evidence gap.
The four-type model risks becoming a labelling system if applied rigidly. A person is not “a Seeker”—they may show seeking patterns in the vestibular domain, avoiding patterns in the auditory domain, and typical registration in the visual domain. Dunn emphasises this variability, but practitioners sometimes flatten it.
Selected works
- Dunn, W. (1997). “The impact of sensory processing abilities on the daily lives of young children and their families: A conceptual model.” Infants & Young Children, 9(4), 23–35. — The foundational theoretical paper.
- Dunn, W. (1999). Sensory Profile: User’s Manual. San Antonio: Psychological Corporation. — The original assessment instrument.
- Dunn, W. (2014). Sensory Profile 2: User’s Manual. Pearson. — The current version of the assessment.
- Brown, C. & Dunn, W. (2002). Adolescent/Adult Sensory Profile: User’s Manual. — Extension of the framework to older age groups.
Last reviewed
2026-04-15