Sensory processing differences
When the Volume Won't Turn Down: What Sensory Overload Actually Feels Like from the Inside
For roughly one in six people, a busy café isn't just noisy — it's a neurological emergency happening in slow motion.
The Idea
The brain's primary job isn't thinking — it's filtering. At every moment, you are receiving millions of sensory signals, and your nervous system is silently deciding which ones deserve your attention and which ones to suppress. For most people, this filtering happens automatically and invisibly. You stop hearing the hum of the refrigerator within seconds of entering a kitchen. You can hold a conversation at a party without consciously registering forty other conversations happening around you. But for a significant portion of the population — including many autistic people, people with ADHD, those with sensory processing disorder, and others who don't carry any diagnosis at all — this filtering system is calibrated differently. The refrigerator doesn't fade. Every conversation at the party arrives at equal volume. The tag on a shirt collar isn't a minor irritation; it's a persistent, impossible-to-ignore sensation demanding immediate resolution. This isn't a failure of willpower or attention. It's a difference in how the nervous system weighs and gates incoming information. Some people are hypersensitive — their threshold for registering stimuli is lower, meaning things become overwhelming faster. Others are hyposensitive — they need more sensory input to feel regulated, which can look like seeking out loud music, physical pressure, or constant movement. Many people oscillate between both states depending on fatigue, stress, or context. What makes sensory processing differences so easy to misread is that they're invisible from the outside. The person who seems rude for wearing headphones at a family dinner, or who 'overreacts' to a texture in food, or who avoids bright shopping centres — they're often doing something quite rational: protecting a nervous system that's already working at full capacity.
In the World
In 2007, the Scottish Parliament building in Edinburgh opened a quiet room — a low-lit, low-stimulation space originally intended for prayer and reflection. What nobody anticipated was how quickly it would be adopted by staff and visitors who simply needed to recover from the sensory demands of the building itself. The parliament's glass atrium, hard surfaces, and constant foot traffic create an environment that many people find subtly but persistently draining. This kind of accidental discovery has since become deliberate design. Changi Airport in Singapore, consistently ranked among the world's most pleasant transit experiences, has noise-dampening materials, carefully controlled lighting temperatures, and deliberately segmented spaces — partly because research showed that sensory overwhelm was a significant driver of passenger stress and complaints. The person whose work brought sensory processing into clinical focus is occupational therapist and neuroscientist A. Jean Ayres, who developed Sensory Integration Theory in the 1970s. Working with children who struggled to function in school despite normal intelligence, she identified that their difficulties weren't cognitive or behavioural at root — they were sensory. The child who couldn't sit still wasn't defiant; their nervous system was seeking vestibular input it wasn't getting. The child who melted down during art class wasn't being dramatic; the texture of the clay was genuinely intolerable. Ayres's insight — that behaviour often makes perfect sense once you understand the sensory experience driving it — has been one of the quieter revolutions in how we understand human variation.
Why It Matters
Even if you don't identify as neurodivergent, understanding sensory processing differences changes how you read people — and possibly how you read yourself. Think about the environments where you do your best thinking versus the ones that leave you inexplicably exhausted. Think about the sounds or textures that irritate you out of proportion to what feels reasonable. Think about the colleague who always requests written instructions rather than verbal ones, or the friend who needs twenty minutes alone after a party before they can decompress. These aren't personality quirks floating free of cause — they're nervous systems doing their best. There's also something worth sitting with here about the gap between internal experience and external perception. Sensory sensitivity is, almost by definition, invisible to observers. This means the people most affected by it have often spent years being told they're too sensitive, dramatic, or difficult — when what they needed was for someone to understand that their experience of the same environment was simply different, not wrong. Knowing this tends to make people more patient, and more curious. Both are worth cultivating.
A Question to Ponder
Is there an environment, texture, sound, or sensation that has always bothered you more than it seems to bother others — and have you ever wondered what that might be telling you about how your nervous system is wired?
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