Sensory Differences

The Senses, One by One

Sensory processing in autism does not only involve the five familiar senses. It also involves lesser-known forms of perception, such as the body’s position in space, the perception of pain, or internal bodily signals. Each of these can be experienced as hypersensitive or hyposensitive, and can also be the focus of active sensory seeking, with its own tools and solutions.

Sight

Light, color, patterns, and movement.

It’s the sense most heavily engaged by today’s environments, from screens to fluorescent lights to signage. Flickering lights, busy patterns, and strong contrasts are often the hardest to tolerate, while other people actively seek out shiny objects, bright lights, or repetitive movements that they find soothing to watch.

Hearing

Sounds, voices, music, and ambient noise.

The difficulty isn’t only about volume. A quiet but continuous sound, like a kitchen exhaust fan or a buzzing fluorescent light, can become unbearable after a few hours. Consciously separating a person’s voice from background noise can take an exhausting amount of effort, which is why a conversation in a restaurant is so much more demanding than the same conversation at home. Sudden, unpredictable noises are generally harder to tolerate than loud noises that are expected.

Touch

Contact on the skin, textures, and pressure.

Light touch and deep pressure do not produce the same effect. A gentle caress, a clothing tag, or a seam can be unbearable, while firm pressure, like a tight hug or a weighted blanket, is often soothing. Unexpected contact is also harder to handle than the same contact announced ahead of time.

Taste and Food Textures

Whatever goes in the mouth: flavors, textures, temperatures, and the smell of food.

Texture is often more of a challenge than taste itself, especially mixed or unpredictable textures, like a food that is soft and crunchy at the same time. Selective eating often has a sensory basis and deserves to be understood as such rather than dismissed as pickiness.

Smell

Body odors, food smells, and environmental scents.

Smell has the particular quality of being hard to escape, since an odor can fill an entire room and cling to clothes and hair. It’s also closely tied to memory and emotion, which is why a smell can trigger an immediate and very strong reaction, sometimes pleasant and sometimes not, without it always being easy to explain.

Nociception

The perception of pain.

Pain can be felt more intensely than expected, or barely at all, with a delay, or only once the surroundings become calm again. This has real consequences for health: an injury or infection can go unnoticed for days, and genuine pain can be doubted by family, friends, or professionals when a person doesn’t express it in the expected way.

Thermoception

The perception of heat and cold.

Some people don’t notice when they’re too cold or too hot, which can lead to dressing without any regard for the weather, or to missing a fever or a situation that could lead to frostbite or burns. Others react strongly to very small changes, to the point that a room that’s only slightly too warm makes it impossible to concentrate. The temperature of water, food, and one’s hands or feet is often where this sensitivity shows up most.

Proprioception (Including Toniception)

The position and movement of different parts of the body, sensed through the muscles and joints.

This is what allows a person to know where their hands are without looking, or to climb a flight of stairs without watching their feet. Toniception, the ability to gauge how much force is being applied, is one component of it: a person might press too hard when writing, drop objects, or grip something without realizing how tightly. Imprecise proprioception often shows up as bumping into door frames and a general sense of clumsiness, while strong proprioceptive input, like pushing, pulling, or carrying weight, tends to have a calming, regulating effect.

Vestibular

Balance and the perception of the head’s movement relative to gravity, sensed by the inner ear.

Some people get dizzy easily and avoid escalators, amusement park rides, or public transit, while others actively seek out movement by swinging, spinning, or hanging upside down. This sense works closely with proprioception and vision, and when the three are out of sync, the discomfort can be significant.

Interoception

The perception of the body’s internal signals: hunger, thirst, the need to use the bathroom, heart rate, muscle tension, and fatigue.

These signals can arrive late, faintly, or all at once, which complicates both responding to basic needs and identifying emotions, since emotions rely on bodily sensations. The current state of the research calls for caution, though: the differences measured mostly show up in children and tend to fade by adulthood, and the validity of the tools used to measure interoception has itself been called into question (Nicholson et al., 2019; Williams et al., 2023; Klein et al., 2025).

Chronoception

The perception of time passing.

A person can completely lose track of time while absorbed in an activity, or, just as easily, feel every minute of waiting with great intensity. It’s worth noting that time perception doesn’t rely on a dedicated sensory receptor like the eye or the ear, but on a network of brain regions. Grouping it with the senses is really just a convenient simplification for talking about it (Wittmann, 2013).