Sensory Discrimination Disorder: Symptoms, Causes, and Support for Children and Adults

Sensory Discrimination Disorder (SDD) is a subtype of Sensory Processing Disorder where a child struggles to interpret and respond to differences in sensory stimuli, such as texture, sound, brightness, temperature, or body position. For example, a child may not notice when their hands are dirty or may struggle to tell apart similar-sounding words like "cat" and "cap."

Signs can include difficulty distinguishing similar sounds or spoken words, trouble recognizing textures or identifying objects by touch, poor body awareness or clumsiness, difficulty judging distance or depth, confusion in crowded or noisy environments, trouble copying shapes or letters, and difficulty telling left from right. These symptoms often affect multiple sensory systems at once and can vary in intensity.

There is no single known cause, but it is believed to result from neurological differences in how the brain processes sensory input. Risk factors include a family history of sensory processing issues, premature birth or low birth weight, birth trauma or developmental delays, and co-occurring conditions such as autism, ADHD, or learning disabilities.

Diagnosis typically involves a comprehensive sensory evaluation conducted by an occupational therapist trained in sensory integration. The process may include parent interviews and developmental history, standardized tests such as the Sensory Integration and Praxis Tests (SIPT), clinical observation during play and movement, and auditory or visual processing assessments.

Yes. In the classroom, SDD can mimic ADHD or a learning disability, which is why accurate diagnosis is essential. Because symptoms overlap with other conditions, diagnosis often involves ruling out autism, ADHD, or language disorders.