How to Help Your Nervous System Notice Safety in Five Ways to Strengthen Sensory Registration
- 3 days ago
- 5 min read
Written by Anele Griessel, Occupational Therapist
Anele Griessel is an expert occupational therapist, well known for sensory preferences, overwhelm, and how simple adjustments in daily activities can nurture the sensory system, reduce overwhelm, and build resilience. She is the author of the Sensory Journal, published in 2020.
Have you ever walked into a room and felt your whole-body brace before you even knew why? Or missed your name being called three times because you were so deep in your own head that the sound simply didn't land? Both of these are your nervous system doing its job of noticing, or in some cases, not noticing. Whether it notices too much, too little, or just enough shapes far more than your senses. It shapes whether your body decides the world around you is safe.
What is sensory registration?
Sensory registration is the very first step in how your brain processes the world. Before you can think about a sound, a touch, a smell, or a feeling in your stomach, your nervous system has to register that it happened at all. This is different from paying attention to something on purpose. Registration is automatic and happens below conscious awareness, at the level of the brainstem and midbrain, long before the thinking parts of your brain get involved.
Occupational therapy pioneer Dr. A. Jean Ayres was among the first to describe registration as a distinct step in sensory processing, separate from how the brain later modulates or responds to that input. In simple terms, registration answers the question, "did something happen?" before the brain even gets to "what should I do about it?" When registration works well, you notice the important things, a change in tone of voice, a full bladder, a hot stove, without being overwhelmed by the unimportant ones, like the hum of the fridge or the tag in your shirt.
How your brain decides what's safe or unsafe
Once something is registered, your brain doesn't just file it away neutrally. It compares it. Research on the hippocampus, one of the brain's key memory and processing structures, describes it as functioning like a comparator. It takes new sensory information and checks it against what is already stored, what is familiar, expected, and safe, and what is new, unexpected, or potentially threatening. A 2001 study on the hippocampus describes this comparator process as central to how the brain selects and registers which incoming information deserves further attention and action.
It means safety isn't something you decide with logic first. Your body decides in milliseconds, based on whether incoming sensory information matches what it already recognizes as safe. If it doesn't match, your nervous system doesn't wait for permission. It acts.
When registration goes wrong: Over and underresponsive patterns
Not everyone registers sensory input the same way, and this isn't a character flaw or a matter of willpower. It's neurology.
Sensory overresponsiveness happens when the nervous system registers input too easily and too intensely. A light tap on the shoulder feels like a shove. A crowded room feels like an assault of noise, movement, and smell all at once. The threshold for "this is too much" is set very low, so ordinary daily input keeps triggering a stress response.
Sensory underresponsivity is the opposite pattern. The threshold for noticing input is set so high that a lot of important information simply doesn't register. Someone might not notice they're hungry until they're lightheaded, not notice they're overheated until they feel unwell, or miss social cues that other people pick up easily. This is often mistaken for laziness or inattentiveness, when in fact the brain genuinely isn't receiving the signal in time.
Research backs up just how much these patterns matter for wellbeing. A 2025 study in the British Journal of Occupational Therapy examined sensory processing patterns in healthy adults and found that both low registration and sensory sensitivity were significant predictors of depression, anxiety, and stress. In other words, how your nervous system notices the world isn't a minor quirk. It has a measurable relationship with your mental health.
Fight, flight, and fawn: What happens when the brain flags "unsafe"
When the brain's comparator system flags something as unfamiliar, too intense, or potentially threatening, it doesn't pause to think it over. It hands the situation to the body's survival circuitry, and one of a few automatic responses takes over.
Fight shows up as irritability, snapping at people, clenched jaw, an urge to argue or control the situation. Flight shows up as restlessness, wanting to leave the room, avoidance, procrastination, or a racing mind that can't settle. Fawn shows up as people pleasing, over-apologizing, agreeing with things you don't actually agree with, and prioritizing everyone else's comfort over your own just to make the perceived threat go away.
None of these are conscious choices in the moment. They happen when the nervous system's noticing system has already decided, correctly or not, that something is unsafe. This is why logic and willpower rarely calm someone down in the middle of a fight, flight, or fawn response. The body needs to be shown safety through the senses before the mind can catch up.
Five ways to increase noticing and strengthen sensory registration
The encouraging part is that registration is trainable. You can help your nervous system get better at noticing the right things, at the right intensity, so it has more accurate information to work with before it decides whether to sound the alarm.
Practice a slow body scan, not a fast one: Set a timer for two minutes and move your attention slowly through your body: feet, legs, stomach, hands, shoulders, jaw. Don't try to relax anything. Just notice what's there. This trains the brain to register internal sensations before they build up to an overwhelming or missed level, improving registration accuracy over time.
Add texture and temperature to your day on purpose: Under-responsive systems often benefit from intentionally rich sensory input: a cold glass of water first thing in the morning, textured food, a firm hug, walking barefoot on grass. These give the nervous system clear, strong signals to register, which helps close the gap between "something happened" and "I noticed it happened."
Name what you notice out loud, even briefly: Saying "my shoulders are tight" or "that sound startled me" out loud, even to yourself, strengthens the neural pathway between registration and awareness. Over time, this makes it easier to catch sensory input earlier, before it has built into a full stress response.
Use orienting to bring your senses into the present room: Pause and name five things you can see, four you can hear, three you can physically feel. This simple grounding exercise directly engages the sensory registration system and gives the brain fresh, accurate, present-moment information to compare against, rather than letting it run on outdated or incomplete input.
Build in regular sensory check-ins, not just crisis check-ins: Most people only check in with their body once something already feels wrong. Instead, build small check-ins into transitions you already have, before a meeting, before eating, before bed. Ask simply, "What am I noticing right now?" This regular practice trains the nervous system to register input consistently, rather than only in moments of overload.
Helping your nervous system feel safe again
Sensory registration might sound like a small, technical piece of how the brain works, but it's the foundation everything else is built on. Before you can regulate an emotion, calm a fight, flight, or fawn response, or feel genuinely safe in your body, your nervous system first has to notice accurately. Strengthening that noticing isn't about trying harder. It's about practicing, gently and consistently, so your brain has better information to work with.
Read more from Anele Griessel
Anele Griessel, Occupational Therapist
Anele Griessel is a leading occupational therapist specialising in sensory integration and overwhelm. As the author of the Sensory Journal, Anele distills more than two decades of knowledge and experience into actionable steps to help reduce overwhelm, build resilience, and enable individuals to thrive personally, with others, at work, and at home. She is the owner of Estemoa-OT. Her mission: Joy is a choice.
