What Is Sensory Processing Disorder?

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When we discuss neurodivergence, the conversation almost always gravitates toward Autism Spectrum Disorder (ASD) and Attention-Deficit/Hyperactivity Disorder (ADHD). For clinicians and self-advocates alike, these diagnostic pillars offer vital language, community, and validation. Yet, a significant clinical population remains in the shadows: individuals who present with severe sensory processing differences but do not meet the diagnostic thresholds for ASD or ADHD. Not to mention the numerous learning disabilities like dyslexia, dyscalculia, and more. For those navigating this gray area, the lack of formal recognition in manuals like the DSM-5-TR creates a profound paradox. They experience a nervous system that is fundamentally differently wired—the very definition of neurodivergence—yet they lack the formal diagnostic keys to access understanding, community, and targeted care.

In clinical practice, we often encounter clients—and sometimes recognize in ourselves—severe sensory atypicalities. This includes profound hyper- or hypo-reactivity to sensory input, vestibular and proprioceptive dysfunction, and difficulties with interoception (the perception of internal bodily states).

While terms like Sensory Processing Disorder (SPD), as well as Sensory Integration Dysfunction, and Misophonia have gained significant traction in popular discourse,........

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