Written by the Inclusive Developmental and Therapy Center therapy team · medically reviewed by Dr Muhammad Suffyan, MB BS (GMC 8023727) · Last reviewed July 2026
We usually think of five senses, but a child’s nervous system is taking in far more than sight, sound, smell, taste and touch. Three ‘hidden’ senses quietly shape how a child moves, sits, calms down and pays attention. When these systems are humming along we barely notice them, but for some children the stream of sensory information feels too much, too little, or simply hard to organise, and that shows up in behaviour, in learning and in everyday life.
This guide explains how the senses work together, why some children chase certain sensations and dodge others, and how all of that connects to their motor skills and behaviour. It also explains what occupational therapists actually do, which is one of the most misunderstood parts of our field. The aim is to help you see the sensory world through your child’s eyes, so that everyday challenges start to make sense and feel more manageable.
The senses, including the three hidden ones
Alongside the five familiar senses, sight, hearing, smell, taste and touch, the body has three lesser-known systems that are every bit as important. Proprioception is the sense of where our body parts are and how much force our muscles are using. It’s what lets us judge how hard to grip a pencil, or climb the stairs without staring at our feet.
The vestibular sense, based in the inner ear, tells us about movement, balance and where our head is in space. It keeps us upright, holds us steady when we turn, and works hand in glove with the eyes. The third hidden sense, interoception, is our awareness of internal signals: hunger, thirst, needing the toilet, a racing heart, feeling too hot. Interoception is closely tied to noticing and managing our emotions.
Together these eight systems give the brain a constant, layered picture of the body and the world around it. Any of them can be tricky, and children often have a mixed profile, very sensitive in one system and under-aware in another.
Sensory processing and modulation
Sensory processing is how the nervous system takes in, organises and responds to all this information. A big part of it is modulation: the knack of turning the ‘volume’ of sensations up or down to suit the situation, so we notice what matters and let the rest fade into the background. When modulation is working well, a child can concentrate in a busy classroom without being knocked sideways by every noise.
Children can be over-responsive, where a sensation feels far stronger or more unpleasant than you’d expect, so a light touch feels painful and a hand dryer feels unbearable. Or they can be under-responsive, missing sensations that others pick up, not seeming to feel a bump or hear their name. These are patterns of responsiveness, not choices the child is making.
This feeds straight into sensory seeking and avoiding. A seeker actively goes looking for more input, crashing, spinning, chewing, touching everything, because their system is hungry for it. An avoider works hard to get away from input that feels like too much, covering their ears or refusing certain textures or foods. And the same child will often seek some sensations while avoiding others.
How sensory needs affect behaviour and learning
Sensory experiences sit underneath a huge amount of behaviour. A child who fidgets, rocks or keeps leaving their seat may be chasing the movement and deep-pressure input their body needs to stay alert and organised. A child who melts down at assembly may be over-responsive to the noise and the crush of bodies. What looks like misbehaviour is very often a nervous system doing its best to cope.
Sensory needs shape learning too. A child spending most of their energy managing an itchy label, a flickering light or the dread of a sudden sound has very little attention left over for the teacher. Under-responsive children can look sluggish or ‘switched off’ simply because their systems aren’t getting enough input to keep them engaged.
Once the adults around a child can see this sensory layer, they respond with understanding instead of frustration. Small changes to the environment, a quieter corner, a movement break, a tweak to where a child sits, can make a real difference to how available that child is for learning and connection.
Motor skills, praxis and coordination
Sensory processing is tightly bound up with how a child moves. Gross motor skills involve the large muscles we use for running, jumping and climbing, while fine motor skills are the small, precise hand movements behind fiddly jobs like doing up buttons and holding a pencil. Good body awareness (proprioception) and balance (vestibular) hold both of them up.
Praxis, or motor planning, is the ability to come up with an idea for a new movement, sort out the steps and carry it through, say working out how to climb through an unfamiliar frame or copy a new dance. A child who finds this hard may know exactly what they want to do yet struggle to get their body to do it smoothly, coming across as clumsy, hesitant or reluctant to try anything physical they haven’t done before.
Coordination pulls the systems together, including using both sides of the body as a team and linking what the eyes see with what the hands do (hand–eye coordination). When all of this takes real effort, the everyday tasks others barely think about, dressing, using scissors, catching a ball, can leave a child tired and frustrated.
What occupational therapists actually do
The word ‘occupation’ throws a lot of parents, who assume it’s about jobs. For a child, occupations are simply the meaningful everyday activities that fill their day: playing, dressing, eating, using the toilet, joining in at school and, not least, handwriting. An occupational therapist (OT) helps a child take part in these as fully and independently as they can.
An OT starts by getting to know the whole child, their sensory profile, their motor skills, their environment and what matters to the family, and then works out why a particular activity is hard. Instead of treating a diagnosis in isolation, we focus on function: what does this child need to be able to do, and what’s standing in the way? From there, support might build the child’s own skills, adapt the task, or change the environment around them.
Occupational therapy for children is practical and usually playful. It might mean building core strength and coordination, developing fine motor and handwriting skills, working through self-care routines, or helping a child manage their sensory needs. The goal is always taking part and feeling confident in real life, not a perfect score on a test.
Practical support: sensory diets and heavy work
One approach we use often is a ‘sensory diet’, a planned, individual set of sensory activities spread through the day to help a child stay calm, alert and ready to engage. Just as meals are spaced out to keep energy steady, these activities are timed to keep the nervous system in a ‘just right’ state. A sensory diet is built for the particular child, ideally with an OT’s guidance, and reshaped as their needs change.
A firm favourite ingredient is ‘heavy work’: activities that push, pull or carry against resistance and so deliver strong proprioceptive input, which a lot of children find organising and calming. Think carrying a basket of books, pushing a laden trolley, animal walks, wall push-ups, or squeezing and kneading dough. Because it tends to settle both seekers and avoiders, heavy work is a wonderfully versatile, low-risk strategy.
These strategies pay off most when they’re consistent, tucked into everyday routines, and matched to the individual child rather than followed like a fixed recipe. If sensory or motor difficulties are affecting your child’s daily life, an occupational therapist can look closely at their particular profile and help you build a plan that fits your family.
Key takeaways
- Beyond the five familiar senses, three hidden ones — proprioception, vestibular and interoception — underpin steady movement and a child’s awareness of their own body.
- Sensory modulation is how the nervous system adjusts the “volume” of sensations; children may be over- or under-responsive.
- Sensory seeking and avoiding are the nervous system meeting its needs, not deliberate misbehaviour.
- Sensory and motor difficulties, including with praxis (motor planning), can quietly affect behaviour and learning.
- Occupational therapists focus on everyday “occupations” — play, self-care, handwriting — helping children take part fully.
- Practical tools like individualised sensory diets and heavy work help children reach a calm, ready-to-learn state.
For students & professionals
A few deeper points worth knowing if you’re studying this area — think of it as a study aid, not a replacement for your course or supervisor.
- The eight sensory systems: the five exteroceptive senses (vision, audition, olfaction, gustation, tactile) plus proprioception, the vestibular sense and interoception — the last three are often called the “hidden” senses.
- Sensory modulation: the neurological regulation of the degree, intensity and nature of responses to sensory input; difficulties present as over-responsivity, under-responsivity, or sensory seeking/craving patterns.
- Praxis: the ability to conceptualise (ideation), plan/organise and execute an unfamiliar motor action; dyspraxia describes difficulty with this planning despite adequate strength and coordination.
- OT scope of practice: occupational therapists enable participation in valued daily occupations by remediating client skills, adapting the activity, or modifying the environment — function, not diagnosis, drives intervention.
- Sensory integration theory (Ayres): the idea that the brain organises sensations from the body and environment for functional use, providing the rationale behind sensory-based approaches such as sensory diets and heavy work.
