Everyday sensations that overwhelm some children—a scratchy clothing tag, the roar of a vacuum cleaner or an unfamiliar smell—may reveal more about their mental health than previously recognized. A large study led by researchers at Washington University School of Medicine in St. Louis has found that sensory over-responsivity, sometimes described as sensory overload or sensory distress, is independently associated with anxiety and autistic traits, but not with attention-deficit/hyperactivity disorder (ADHD). The findings challenge a common assumption that extreme reactions to ordinary sights, sounds, textures or smells are primarily an expression of autism or ADHD. They also suggest that sensory sensitivity may reflect identifiable differences in how the developing brain integrates incoming information with context and behavior.
Sensory over-responsivity occurs when the nervous system responds to a stimulus more intensely, rapidly or persistently than expected. A sound that most children can ignore may provoke fear or distress; a fabric texture may become intolerable; or a familiar household odor may trigger an urge to escape. Researchers estimate that between 15% and 20% of children experience these reactions to some degree, although the severity and impact vary widely. For some children, sensory distress can interfere with dressing, eating, sleeping, attending school or participating in family activities. Because sensory symptoms appear across multiple psychiatric and neurodevelopmental conditions, clinicians have struggled to determine whether they point toward a particular diagnosis or represent a broader feature of childhood mental health.
To investigate the issue, Rebecca Schwarzlose, PhD, and colleagues combined data from five studies involving 15,728 children between 6 and 18 years old. The pooled datasets included children diagnosed with autism as well as participants from the general population, including some with neurodevelopmental or psychiatric symptoms. Parents or caregivers completed standardized questionnaires measuring anxiety, depression, ADHD symptoms and autism-related traits. These assessments also included an item designed to capture sensory sensitivity. By examining such a large and varied sample, the researchers were able to test whether sensory over-responsivity remained associated with particular conditions after accounting for the substantial overlap among psychiatric symptoms.
That overlap is central to interpreting the results. Anxiety, autism and ADHD frequently occur together, and a simple statistical comparison could make sensory sensitivity appear linked to a condition merely because that condition overlaps with another one. The research team therefore used an analytical method designed to estimate the independent contribution of each set of symptoms. After the overlapping relationships were taken into account, most apparent associations disappeared. Two consistent signals remained: children with greater sensory over-responsivity tended to show elevated anxiety symptoms and elevated autism-related traits. ADHD symptoms, however, did not show a direct relationship with sensory over-responsivity in the analysis.
The pattern was remarkably stable. The connection between sensory distress, anxiety and autistic traits appeared in both community-based samples and groups that included children with an autism diagnosis. It also remained evident across the age range studied. The result does not mean that children with ADHD cannot experience sensory sensitivity, nor does it establish that anxiety or autism causes sensory over-responsivity. Instead, it indicates that, when the effects of overlapping symptoms are separated statistically, sensory over-responsivity tracks more closely with anxiety and autism-related characteristics than with ADHD itself. That distinction could help clinicians interpret sensory complaints more accurately rather than treating them as an automatic sign of one specific diagnosis.
The researchers then examined whether sensory sensitivity could also be detected in the brain. A subset of 9,197 children underwent resting-state functional magnetic resonance imaging, or resting-state fMRI. During this type of scan, participants do not perform a task; they lie still while the scanner records spontaneous fluctuations in blood oxygen levels across the brain. Researchers use correlations between these fluctuations as an estimate of functional connectivity—the degree to which different brain regions communicate or coordinate their activity. Functional connectivity does not directly measure anatomical wiring or prove that one region controls another, but it can reveal whether networks show unusually strong or weak patterns of synchronized activity.
In the imaging analysis, sensory over-responsivity was associated with reduced connectivity between a relatively small network involved in memory and a deep-brain structure that helps translate sensory information into action. This finding offers a possible neural explanation for why an otherwise harmless sensation can feel immediately threatening. Sensory signals are normally interpreted in light of context: a sudden noise in a familiar home may be recognized as a vacuum cleaner, while the same noise in an unknown setting may demand attention. If communication between systems supporting contextual memory and systems involved in action selection is less efficient, incoming information may be less effectively matched to prior experience before a defensive response is initiated.
Christina Luo, who conducted the work as a master’s student in Schwarzlose’s laboratory, said the altered connection could mean that sensory information is not fully integrated with a child’s understanding of what is normal and safe. In that scenario, an innocuous sound or texture may trigger a raw reaction before the brain has incorporated the surrounding context. The study’s large sample and replication across datasets strengthen the finding, but the authors emphasize that the imaging results are correlational. The connectivity pattern is not a diagnostic test, and it cannot yet predict which individual child will develop sensory distress or determine which treatment will work best.
The findings may nonetheless have immediate implications for families and clinicians. Sensory reactions should not be dismissed as misbehavior, attention-seeking or a child being deliberately difficult. Nor should they be used alone to assign a diagnosis. A careful assessment can consider anxiety, autistic traits, ADHD and other factors while also identifying the environments and sensations that provoke distress. Support may include occupational therapy, changes to clothing or classroom settings, predictable routines, gradual exposure strategies and other targeted modifications. Schwarzlose’s team is now studying younger children and infants to determine when sensory over-responsivity first emerges and how the relevant neural circuits develop. Understanding those early changes could eventually allow support to begin before sensory distress limits a child’s participation in everyday life.
Subject of Research: People
Article Title: Specific, replicable behavioral and neural correlates of sensory over-responsivity in childhood
News Publication Date: 13-Aug-2026
Web References: https://psychiatry.wustl.edu/people/dr-rebecca-frye-schwarzlose/ ; https://medicine.washu.edu/
References: Luo H, Kim AW, Gurnett CA, Abbacchi AM, Constantino JN, Luby JL, Perino MT, Barch DM, Sylvester CM, Camacho CM, Schwarzlose RF. “Specific, replicable behavioral and neural correlates of sensory over-responsivity in childhood.” Journal of the American Academy of Child & Adolescent Psychiatry, August 13, 2026.
Image Credits: Sara Moser/WashU Medicine
Keywords: sensory over-responsivity, sensory distress, sensory sensitivity, autism, anxiety, ADHD, child development, functional connectivity, resting-state fMRI, developmental psychology
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