Is It Autism Or Sensory Processing Disorder?

Key Takeaways

Sensory processing disorder (SPD) can exist as a standalone condition and is not confined to people on the autism spectrum.
SPD primarily shows up in three ways: sensory modulation disorder, sensory-based motor disorder, and sensory discrimination disorder.
Over 90% of children with autism show atypical sensory behaviors, and since 2013 hyper- or hyporeactivity to sensory input is part of the DSM-5 criteria — but that does not run the other way, and most children with sensory differences are not autistic.¹
About one child in six is affected: in a study of 925 children aged seven to eleven, 16% of parents reported that at least four tactile or auditory sensations bothered their child.² Most of them do not meet the criteria for autism.
Imaging work comparing boys with autism against boys with sensory processing differences found shared disruption in sensory pathways and divergent connectivity in social-emotional pathways — which is close to the answer this page's title asks for.¹

Sensory processing disorder (SPD) often flies under the radar, yet it plays a crucial role in understanding the complexities of human sensory experiences. For a long time, sensory sensitivities were largely associated with autism. Individuals on the autism spectrum frequently exhibit atypical responses to sensory stimuli — one might be highly sensitive to loud and chaotic environments, while another may find the slightest irritant from clothing tags unbearable. However, emerging research highlights that SPD is not confined to those with autism; it can exist as a standalone condition.

SPD primarily manifests in three distinct ways:

Sensory Modulation Disorder: This subtype affects how an individual perceives and responds to sensory input. An individual may be hyper-reactive, hypo-reactive, or may seek out certain sensory experiences more intensely. This can lead to over-responsiveness to stimuli like bright lights or loud sounds, or an under-responsiveness where a person might not notice important sensory cues.
Sensory-Based Motor Disorder: Coordination and movement issues stem from sensory-based motor disorders. When the body’s sense of balance and spatial orientation is impaired, it can complicate movement planning and execution. As a result, individuals might struggle with tasks that require coordinated motor skills, such as writing or throwing a ball.
Sensory Discrimination Disorder: Difficulty in distinguishing between sensory inputs characterizes this pattern. It includes challenges in identifying differences between similar sensations, which can impact daily functioning. For example, a person might confuse a whispered ‘N’ with an ‘M’ or find it difficult to sense their own bodily needs.

The prevalence of SPD among individuals with autism has previously led to assumptions that SPD was a mere facet of autism spectrum disorder. Studies indicate that a significant proportion of people with autism — between 90–95% — experience some form of sensory processing difficulty. Nonetheless, this does not mean that all people with SPD are on the autism spectrum. In fact, statistical insights suggest that as many as 1 in 6 children exhibit SPD features that significantly interfere with their daily lives, yet most of these children do not meet the diagnostic criteria for autism.

Research conducted by the University of California, San Francisco, further distinguishes SPD from autism by revealing variances in brain connectivity. Significant differences were noted in the neural pathways of boys with SPD compared to those with autism. This finding highlights the neurological uniqueness of SPD, suggesting that it involves specific brain structure disconnections, not necessarily present in autism cases.

The medical community remains divided over whether SPD should be formally recognized as a separate diagnosis or considered a symptom observed in conjunction with other disorders like ADHD or anxiety disorders. For those directly affected by SPD, however, resolving this debate holds less immediate significance compared to recognizing the disorder’s impact and seeking appropriate interventions. Acknowledging SPD’s singular challenges equips individuals and caregivers with the necessary awareness to pursue effective therapies, much needed to improve quality of life.

Ultimately, understanding SPD as a distinct entity promises better-targeted treatments and opens pathways for further investigation into how varying sensory experiences shape our interaction with the world. As awareness and research continue to grow, individuals affected by SPD can find solace in the progressive development of supportive strategies tailored to their sensory needs.

What the brain imaging actually shows

The question in the title has been examined directly, and the answer is more specific than "they are different".

Researchers compared boys with autism against boys with sensory processing differences using diffusion imaging of white matter tracts. They found disruption in sensory pathways in both groups — the sensory difficulty looks similar at the level of the wiring — and divergent connectivity in the pathways serving social and emotional processing, where the autistic group differed and the sensory-only group did not.¹

What the two share

The sensory part. A child with sensory differences and no autism can react to sound, texture or movement as strongly as an autistic child, and the underlying sensory pathway findings are comparable.

What separates them

The social and emotional side. Autism involves differences in how social interaction and communication are processed; sensory difficulty on its own does not.

This is research, not a test

No brain scan diagnoses either condition. The imaging explains why the two are so easily confused; the distinction is still made by clinical assessment.

Frequently Asked Questions

Can a child have sensory processing disorder without being autistic?

Yes. While sensory sensitivities were long associated with autism, emerging research shows SPD can exist as a standalone condition, and most children with significant SPD features do not meet the diagnostic criteria for autism.

What are the main types of sensory processing disorder?

SPD primarily manifests in three ways: sensory modulation disorder, which affects how a person perceives and responds to sensory input; sensory-based motor disorder, which involves coordination and movement difficulties; and sensory discrimination disorder, which involves trouble distinguishing between similar sensory inputs.

How common is sensory processing disorder in children?

About one child in six is affected: 16% of parents in one study of 925 children aged seven to eleven reported at least four tactile or auditory sensations bothered their child, and most of these children do not meet the diagnostic criteria for autism.

Is sensory processing disorder the same as autism?

No. Although a high proportion of people with autism (between 90 and 95%) experience sensory processing difficulties, SPD is recognized as neurologically distinct, with brain-connectivity differences noted between children with SPD and those with autism.

Is sensory processing disorder an officially recognized diagnosis?

The medical community remains divided on whether SPD should be formally recognized as a separate diagnosis or viewed as a symptom seen alongside other conditions like ADHD or anxiety; regardless, recognizing its impact helps families pursue appropriate interventions.

Sources

Chang YS, Owen JP, Desai SS, Hill SS, Arnett AB, Harris J, Marco EJ, Mukherjee P. Autism and sensory processing disorders: shared white matter disruption in sensory pathways but divergent connectivity in social-emotional pathways. PLoS One. 2014;9(7):e103038. doi:10.1371/journal.pone.0103038 (PMID 25075609). DOI verified at Crossref; abstract read at Europe PMC.
Ben-Sasson A, Carter AS, Briggs-Gowan MJ. Sensory over-responsivity in elementary school: prevalence and social-emotional correlates. Journal of Abnormal Child Psychology. 2009;37(5):705–716. doi:10.1007/s10802-008-9295-8 (PMID 19153827). Parent report, tactile and auditory over-responsivity specifically. DOI verified at Crossref; abstract read at Europe PMC.

Medical disclaimer. This page is for general educational purposes and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your child.