Sensory processing: what it is, how it shows up, and why it matters for diagnosis
Most people have had the experience of finding a sound annoying, a fabric uncomfortable, or a smell overwhelming in a particular moment. That's normal sensory experience. What's different for people with sensory processing differences is that those responses aren't situational. They're consistent, they're often intense beyond what the situation seems to warrant, and they shape daily life in ways that accumulate over years into a set of patterns and preferences that the person may have stopped questioning because they've always been there.
Sensory processing differences are one of the most underrecognized features of neurodevelopmental conditions, partly because they're invisible to anyone who isn't experiencing them, and partly because the people experiencing them have often normalized them completely. Understanding what sensory processing actually is, and what it looks like across different profiles, matters both for accurate diagnosis and for understanding why certain environments and demands are harder than they appear to be from the outside.
What sensory processing actually is
Sensory processing refers to how the nervous system receives, interprets, and responds to sensory information from the environment and from the body itself. Most people think of the five senses, but the sensory system also includes proprioception, which is the sense of where your body is in space, and interoception, which is the sense of what's happening inside the body, things like hunger, thirst, temperature, pain, and emotional states. All of these channels feed into how a person experiences and navigates the world.
Sensory processing differences occur when this system is calibrated differently from the average. The nervous system may register input more intensely than typical, a condition called hypersensitivity or sensory over-responsivity. It may register input less intensely than typical, called hyposensitivity or sensory under-responsivity. Many people have both simultaneously across different sensory channels, which produces a profile that can look inconsistent from the outside: highly sensitive to sound but actively seeking intense physical input, for example, or overwhelmed by light touch but comfortable with deep pressure.
How sensory differences show up in daily life
Sensory hypersensitivity in the auditory channel looks like being unable to filter background noise, finding environments with multiple simultaneous sound sources genuinely painful or cognitively overwhelming, being startled by sounds that other people habituate to, and needing significant recovery time after noisy environments. The person isn't being dramatic about the concert or the open-plan office. Their nervous system is processing those environments at a different intensity than their colleagues are.
Visual hypersensitivity often shows up as sensitivity to fluorescent lighting, difficulty in visually busy or cluttered environments, needing sunglasses in conditions that others find ordinary, and finding screens fatiguing at exposure levels that neurotypical people tolerate without noticing. Tactile hypersensitivity produces clothing preferences that look like fussiness from the outside: specific textures that are unwearable, tags that must be removed, waistbands that feel intolerable, fabrics against skin that register as distracting or painful rather than neutral.
Hyposensitivity produces a different set of patterns. The person who seeks intense physical input, who needs to move constantly, who doesn't register pain the way others do, who has difficulty knowing where their body is in space and knocks into things regularly, who needs a lot of sensory stimulation to feel present and regulated. These patterns often look like restlessness or carelessness rather than a sensory need, which means they tend to attract correction rather than accommodation.
"I spent my whole career avoiding open-plan offices and getting told I wasn't a team player. Nobody ever framed it as a sensory issue. I just thought I was difficult."
Interoceptive differences are among the most clinically significant and least discussed. Difficulty accurately reading internal body states affects hunger and fullness cues, thirst, pain recognition, temperature regulation, and the ability to identify emotional states as they're happening. Interoceptive differences in autistic people are associated with alexithymia, which is difficulty identifying and describing emotions, and with eating difficulties, chronic under or over-eating driven by inaccurate hunger signals rather than choice.
Sensory processing differences across conditions
Sensory processing differences are most strongly associated with autism, where they're now included as a diagnostic criterion in the DSM-5. But they appear across a range of neurodevelopmental conditions. ADHD is associated with sensory sensitivity and sensory seeking, particularly the need for physical movement and tactile input. Anxiety amplifies sensory responses, which means sensory difficulties and anxiety tend to reinforce each other in ways that are hard to disentangle without a thorough evaluation. Trauma history also affects sensory processing through its impact on nervous system regulation, which means sensory sensitivity in someone with a trauma history requires careful clinical interpretation.
This overlap means that sensory processing differences alone don't point to a single diagnosis. What they do is provide important clinical information that, combined with the rest of the evaluation picture, helps build an accurate understanding of what's driving a person's experience. An evaluation that doesn't assess sensory processing is missing a significant piece of data.
Why sensory differences get missed in adults
By adulthood, most people with sensory processing differences have built their lives around them without identifying them as sensory-related. They've chosen careers that minimize exposure to overwhelming environments. They've decorated their homes in ways that feel manageable. They've developed a set of rules about what they can and can't tolerate that they may describe as preferences or quirks rather than adaptations to a different nervous system.
The normalization is so complete that it often doesn't come up in clinical conversations unless someone asks specifically. A person presenting for an ADHD evaluation isn't typically going to mention that they find open-plan offices cognitively impossible, or that they've never been able to eat in a cafeteria without earplugs, or that they leave parties earlier than they want to because they hit a wall that other people don't seem to hit. These things feel personal and slightly embarrassing, not clinically relevant.
They are clinically relevant. A comprehensive evaluation that includes detailed sensory history often produces recognition that is as significant for the person as the diagnostic conclusions themselves. Understanding that a lifetime of environmental management was a response to a different nervous system rather than a set of inexplicable limitations changes how a person understands their own history and what they can reasonably ask for going forward.
What sensory history adds to an evaluation
A thorough sensory history taken as part of a comprehensive evaluation asks about responses across sensory channels, current and historical, and looks for patterns that are consistent over time and across settings. It considers the adaptive strategies the person has developed, because those strategies are themselves data. It connects sensory patterns to the functional impact they've had on work, relationships, and daily life. And it contributes to differential diagnosis by helping clarify whether sensory differences are present in the way that's consistent with autism, ADHD, anxiety, trauma, or some combination.
For many people, the sensory history portion of an evaluation is the first time anyone has asked them systematically about these experiences, and it tends to produce significant recognition. The person who has spent decades managing a nervous system they didn't have a framework for understanding finally has one. That framework doesn't change the sensory system, but it does change what the person can do with the information, and it changes what support they can ask for from the environments they live and work in.
Grey Matter specializes in evaluating sensory processing to help you make sense of your experience and support your ongoing care. We’re ready to support you.
Frequently asked questions
Q: Is sensory processing disorder the same as autism?
A: No, though the two frequently overlap. Sensory processing differences are a feature of autism and are now included as a diagnostic criterion in the DSM-5, but they also appear in ADHD, anxiety disorders, and in people without any other neurodevelopmental diagnosis. Sensory processing disorder as a standalone diagnosis is recognized by occupational therapists but is not currently a formal DSM diagnosis, which creates some confusion in clinical settings. The more useful clinical question isn't whether sensory differences constitute a separate diagnosis, but what's driving them in a particular person and how they fit into the broader profile. A comprehensive evaluation can answer that with more specificity than a label alone provides.
Q: My child has intense reactions to clothing, food textures, and loud sounds. Is that a sensory issue?
A: It's worth taking seriously as a possible sensory issue, yes. Consistent, intense reactions across multiple sensory channels that go beyond typical childhood preferences and don't diminish with exposure or reassurance are a pattern worth evaluating rather than managing in isolation. What's important to determine is whether the sensory differences are present on their own, as part of an autism profile, or as part of a broader neurodevelopmental picture that includes attention, learning, or emotional regulation differences. Getting a comprehensive evaluation rather than addressing each reaction individually tends to produce more useful and more lasting answers.
Q: Can sensory processing differences develop in adulthood, or are they always present from childhood?
A: Sensory processing differences that are neurologically based are typically present from early life, though they may not have been identified or named. What changes in adulthood is often the context rather than the neurology: adult environments tend to have fewer built-in accommodations than childhood ones, and the person has less control over their sensory exposure than they did as a child living in a home their family managed. Sensory sensitivity can also appear to worsen during periods of stress, illness, hormonal change, or burnout, because the nervous system's capacity to regulate is reduced. If sensory difficulties feel new in adulthood, it's often worth looking at what's changed in the environment or the person's overall regulatory capacity rather than assuming the sensory differences themselves are new.
Q: Does having sensory sensitivities mean I'm autistic?
A: Not necessarily on its own. Sensory sensitivities are strongly associated with autism but aren't exclusive to it. They appear in ADHD, anxiety, trauma responses, and in some people without any other identified condition. What sensory sensitivities do is provide important clinical information that, combined with a full evaluation picture, helps clarify what's actually going on. If you have significant sensory sensitivities alongside social communication differences, strong preferences for routine, and intense focused interests, that constellation is worth exploring with a comprehensive evaluation. If the sensory piece is present without much of the rest of the autism profile, the evaluation may point in a different direction. Either way, understanding what's driving the sensitivity is more useful than the label alone.
