Your child covers their ears at the grocery store. They refuse to wear certain shirts. They crash into furniture, spin in circles, or seem completely unbothered when they bump their head. And you have been wondering — is this a behavior problem, or something else entirely?
In many cases, it is neither. What you are watching is your child's nervous system communicating — in the only language it has. And when you understand the eight sensory systems behind that communication, you stop asking "why is my child acting this way?" and start asking something far more useful: "what does my child's nervous system need right now?"
The five classic senses — sight, sound, smell, taste, and touch — connect us to the world outside. But the human body has three additional sensory systems that most people have never heard of, and for many autistic children, these are some of the biggest drivers of behavior every single day.
| Sense | What It Does |
|---|---|
| 👋 Tactile | Processes touch, textures, temperature, and physical contact |
| 👁️ Visual | Processes light, movement, color, and visual complexity |
| 👂 Auditory | Filters and interprets sounds in the environment |
| 👃 Olfactory | Processes the intensity and quality of scents |
| 👅 Gustatory | Processes taste, food textures, and oral sensations |
| 💪 Proprioceptive Often Missed | Senses where the body is in space, through muscles and joints |
| 🌀 Vestibular Often Missed | Processes movement, balance, and spatial orientation |
| ⭐ Interoceptive Often Missed | Senses the body's internal state — hunger, pain, temperature, emotion |
Before diving into each system, it helps to know that sensory differences show up in two main ways. A child who is over-sensitive (hyper) receives input as more intense than typical — things most people tune out feel unbearable. A child who is under-sensitive (hypo) craves more input than they are getting, so they seek it out in ways that often look like "big behaviors."
The same child can be over-sensitive in one system and under-sensitive in another at the same time. A child who covers their ears at loud sounds (over-sensitive to auditory input) might also crash into walls and furniture all day (under-sensitive to proprioceptive input). This is why a one-size-fits-all plan never works.
From a behavior analysis perspective, knowing which direction a child is dysregulated in — and in which system — is essential. It changes the antecedent strategies, the environmental modifications, and the replacement skills we build. Behavior does not happen in a vacuum. It happens in a body.
Of all eight systems, interoception is the one most families have never heard of — and for many autistic children, it is one of the most important to understand. Interoception is the body's ability to sense its own internal state: hunger, thirst, pain, temperature, a full bladder, a racing heart, or the feeling in your stomach when you are anxious. It is how we feel emotions before we can name them.
Many autistic children process interoceptive signals with the "volume" turned down. They may not notice they are hungry, in pain, or overheated until they have reached a breaking point. A child who suddenly becomes aggressive may have had an earache for hours without registering it. A teen who "melts down out of nowhere" after school may have been absorbing sensory overload all day without feeling it build.
Behaviors that seem to appear out of nowhere often have an interoceptive signal behind them that finally hit a tipping point.
Research support: Mahler et al. (2022), PLOS ONE — interoception-based intervention improved emotion regulation, hunger/thirst awareness, and pain recognition in autistic children. PMC9045986.
Interoception is also the foundation of emotional regulation. Before a child can label how they feel — anxious, frustrated, excited — they first have to feel it in their body. Supporting interoceptive awareness is a core part of building long-term communication and regulation skills, not a therapy "extra."
Sensory understanding is not separate from behavior analysis at SoPo — it is built into every assessment and support plan from the start. Here is what that looks like in practice:
At SoPo Behavior, every support plan starts with understanding your child's unique sensory profile. You work directly with a BCBA — not a technician. No waitlist. Multilingual services in English, Cantonese, and Vietnamese.
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