What Is Sensory Processing Disorder in Children?

Imagine that every sound in the room you’re sitting in right now — the hum of the refrigerator, a distant car, air moving through a vent, the rustling of your own clothes — all came in at the same volume as the thing you’re actually trying to focus on. No filtering. No hierarchy. All of it, equally loud, equally demanding. Now imagine trying to have a conversation, read something, or sit still.

That’s a rough approximation of what daily life feels like for a child whose sensory processing system isn’t filtering information the way it should. Not because something is wrong with them. Because something is happening in their nervous system that the people around them — including most of their doctors — were never trained to look for.

How Sensory Processing Works

The nervous system receives constant input from the environment — visual, auditory, tactile, proprioceptive, vestibular, olfactory, gustatory, and interoceptive. The brain’s job is to receive all of this simultaneously and decide what matters and what doesn’t. This filtering process is called sensory modulation, and it is one of the nervous system’s most sophisticated functions. When it works well, a child can sit in a classroom and focus on the teacher’s voice while ignoring the movement in the hallway, the sensation of the chair, and the ambient noise of the HVAC system.

When sensory modulation is disrupted, the filter fails. The child cannot distinguish between relevant and irrelevant input. Everything competes for attention simultaneously, and the nervous system responds in one of two ways: shutdown — appearing inattentive and withdrawn — or overdrive — appearing hyperactive and overwhelmed.

What the Research Tells Us

Sensory processing disorder is more common than most parents realize. Research published in the American Journal of Occupational Therapy found that approximately 1 in 6 children experiences sensory symptoms severe enough to interfere with everyday functioning [1]. A landmark neuroimaging study in NeuroImage: Clinical demonstrated that children with sensory processing disorder show measurable differences in white matter microstructure in the sensory processing regions of the brain compared to typically developing children [2]. This is not a behavioral pattern. It has a visible neurological basis.

Sensory Seeking vs. Sensory Avoiding

Sensory avoiding children are hypersensitive to input. They cover their ears at ordinary sounds, refuse clothing with certain textures, become overwhelmed in busy environments, and react intensely to unexpected touch. Their nervous system is registering sensory input at a higher intensity than it actually is — the gain is turned up too high. Sensory seeking children appear to need more input than the environment provides. They crash into furniture, seek deep pressure, make constant noise, and seem to have an extraordinarily high threshold for pain. The gain is too low and they are behaviorally seeking the stimulation their system needs to feel organized.

Both presentations involve the same underlying disruption in sensory modulation. The direction of the response differs, but the nervous system mechanism is the same.

Why This Doesn’t Get Better With Behavioral Approaches Alone

Weighted blankets, noise-canceling headphones, sensory diets, environmental modifications — these are all tools that can reduce the sensory load a child has to manage. But they don’t address the modulation system itself. They accommodate the dysregulation rather than resolving it. At The Wellness Path, we look at sensory processing through the lens of the nervous system — specifically how spinal subluxation, retained primitive reflexes, and autonomic dysregulation are contributing to the child’s sensory experience. When those underlying factors are addressed, the sensory threshold often begins to normalize — not because we treated a condition, but because the system producing the threshold disruption is finally functioning differently.

Families across Knoxville, Maryville, and Morristown bring their children to us because they’ve tried the accommodations and they’re tired of accommodating. They want to know if there’s something that can actually change the picture. Often there is.

What We Look For at the Nervous System Level

At The Wellness Path, when a child presents with sensory processing challenges, we’re looking at the specific nervous system factors that drive sensory modulation disruption. The Moro reflex, when retained past its developmental integration window, keeps the nervous system in chronic hypervigilance — a state of perpetual sensory alertness in which ordinary input is experienced as potentially threatening and the threshold for sensory overload is dramatically reduced. When we assess these factors objectively — through INSiGHT neurological scanning, primitive reflex evaluation, and autonomic function measurement — we get a picture of what the sensory processing system is working with. Families across Knoxville, Maryville, and Morristown bring their children to us because they’ve spent years accommodating sensory challenges and they’re exhausted by the accommodation

Related Resources

• Condition Page: Sensory Processing Disorder
• Service Page: Pediatric Chiropractic Care
• Location Page: Knoxville Office
• Related Blog: Sensory Processing vs ADHD
• Related Blog: Signs of Nervous System Dysregulation

References

• [1] Ahn, R.R., Miller, L.J., Milberger, S., & McIntosh, D.N. (2004). Prevalence of parents’ perceptions of sensory processing disorders among kindergarten children. American Journal of Occupational Therapy, 58(3), 287–293.
• [2] Owen, J.P., et al. (2013). Abnormal white matter microstructure in children with sensory processing disorders. NeuroImage: Clinical, 2, 844–853.