Autism and Sensory Integration Disorders (SI) in Children Similarities, differences, and interrelationships What is Sensory Integration (SI)?

Sensory integration is the process by which the brain receives, organizes, and interprets sensory input from the body and the environment (touch, movement, sound, vision, smell, taste, and proprioception).

When this process does not work properly, we speak of Sensory Processing Disorders (SPD) / sensory integration difficulties.

A child with SI difficulties may:

• be over‑ or under‑sensitive to stimuli (e.g. noise, touch, clothing),
• seek intense sensory input (movement, pressure, chewing),
• have difficulties with emotional regulation, concentration, and behavior,
• respond strongly to changes and sensory overload.

What is Autism Spectrum Disorder (ASD)?

Autism is a neurodevelopmental condition that affects:

• social communication,
• relationships with others,
• flexibility of thinking and behavior,
• the way sensory input is processed.

Sensory processing differences are one of the diagnostic criteria for autism (DSM‑5), which means that:

every child on the autism spectrum experiences atypical sensory processing, although it may look very different from one child to another.

The relationship between autism and sensory integration disorders

1. Every child with autism has sensory processing differences

Children with ASD commonly experience:

• hypersensitivity to sounds, touch, or light,
• food selectivity,
• a strong need for routine,
• self‑stimulatory behaviors (e.g. hand flapping, jumping, chewing),
• difficulties with emotional regulation.

 These are not “bad behaviors” but nervous‑system responses to sensory overload.

2. Not every child with sensory integration disorders has autism

An important distinction:

• sensory integration difficulties can occur on their own,
• a child may have significant sensory challenges while still having:
• appropriate social communication,
• the ability to build relationships,
• adequate understanding of other people’s emotions.

How to differentiate autism from isolated sensory integration disorders

 In autism, sensory difficulties are part of a broader neurodevelopmental profile, not the only difficulty.

Why are children with sensory difficulties sometimes mistaken for being on the spectrum?

Because in both cases the following may be observed:

• repetitive or rigid patterns of behavior,
• intense emotional reactions,
• strong need for routine,
• self‑stimulatory behaviors,
• difficulties in group settings,
• challenges with emotional regulation.

 The key factor is the quality of social interaction and communication, not the behaviors alone.

The role of sensory integration therapy in children with and without ASD

Sensory Integration (SI) therapy:

• does not “treat” autism,
• but it significantly reduces nervous‑system overload,
• which helps the child:
• regulate emotions more easily,
• reduce self‑stimulatory behaviors,
• function better socially and emotionally,
• learn more effectively.

In children without ASD, SI therapy may be the primary intervention,
while in children with ASD it is a very important supportive component of therapy.

Summary

• Sensory integration disorders often co‑occur with autism, but they are not the same condition.
• Every child with autism has sensory processing differences.
• Not every child with sensory difficulties is on the autism spectrum.
• Diagnosis should always be based on a comprehensive view of the child’s functioning, not on a single area of difficulty.