Sensory Processing Disorder (SPD) affects about 16% of school-aged children and is especially common among those with neurodevelopmental conditions such as autism spectrum disorder (ASD) and attention deficit hyperactivity disorder (ADHD) 1. SPD involves differences in how the brain receives and responds to sensory information, which can lead to challenges in daily functioning and social interactions2 . Although SPD is not currently recognized as a distinct medical diagnosis, understanding its types, symptoms, causes, and treatments is essential for improving quality of life for affected individuals3 .
Types of Sensory Processing Disorder
Sensory Processing Disorder manifests in different ways depending on how an individual processes sensory stimuli. The main types include Sensory Over-Responsivity, Sensory Under-Responsivity, and Sensory Craving1 .
Sensory Over-Responsivity (SOR)
Sensory over-responsivity is characterized by exaggerated or intense reactions to sensory input such as noises, textures, or lights4 . Children with SOR may react negatively to common sensory stimuli, including everyday sounds, bright lights, or certain fabric textures5 . This heightened sensitivity often leads to avoidance of social situations due to sensory overload, which can cause distress and withdrawal4 . For example, a child might cover their ears or avoid crowded places because the sensory input feels overwhelming5 .
Sensory Under-Responsivity (SUR)
In contrast, sensory under-responsivity involves diminished or delayed responses to sensory stimuli compared to peers5 . Children with SUR may seem lethargic, indifferent, or unaware of sensory input that others notice easily4 . Oral sensory seeking behaviors, such as frequently mouthing objects, are common in this group5 . These children might not respond to pain or temperature changes as expected, which can pose safety concerns6 .
Sensory Craving (SC)
Sensory craving is marked by an excessive need for sensory input and a reduced awareness of personal space4 . Children with SC often display clumsiness, frequently bumping into objects or people, and may seek constant tactile or movement stimulation5 . They might engage in behaviors such as touching everything or moving continuously to satisfy their sensory needs6 .
SPD Symptoms and Signs
The symptoms of SPD vary widely depending on the subtype but generally involve either hypersensitivity or hyposensitivity to sensory stimuli5 . Common self-regulatory behaviors include ear covering, rocking, and eye closing as attempts to manage overwhelming sensory input4 . SPD can impair attention regulation and social communication skills, making it difficult for affected children to engage in typical social interactions5 . Emotional outbursts or meltdowns are frequent, often triggered by sensory overload4 .
In addition to behavioral symptoms, children with SPD commonly experience gastrointestinal issues and sleep disturbances, which further complicate daily life7 . Food selectivity and eating challenges are also prevalent, as certain textures or tastes may be intolerable7 . These symptoms often increase family stress and disrupt routines5 .
Common SPD Symptoms:
- Hypersensitivity or hyposensitivity to sensory stimuli5
- Covering ears, rocking, or closing eyes to cope with sensory input4
- Difficulty with attention and social communication5
- Emotional meltdowns or outbursts4
- Gastrointestinal problems and sleep disturbances7
- Food selectivity and eating difficulties7
- Clumsiness and frequent bumping into objects (especially in sensory craving) 5
Causes of Sensory Processing Disorder
The exact cause of SPD is not fully understood, but research points to abnormalities in early brain development, including prenatal and perinatal factors8 . Sensory systems begin developing before birth, with fetuses responding to sensory stimuli in utero8 . Prematurity and low birth weight can interrupt critical periods of brain development, increasing the risk of sensory processing difficulties8 . Studies have found reduced brain volume and altered white matter integrity in children with SPD, which affect how sensory information is processed9 .
Genetic factors, prenatal exposures, and complications during birth also contribute to the etiology of SPD8 . SPD is more prevalent among children with neurodevelopmental disorders, affecting up to 90% of children with autism spectrum disorder1 . These findings suggest a complex interaction of genetic and environmental factors in SPD development.
Diagnosing Sensory Processing Disorder
Diagnosis of SPD primarily relies on clinical observation and caregiver questionnaires, as there are no standardized biomarkers or routine neuroimaging tools for clinical diagnosis10 . Behavioral checklists completed by caregivers and educators are essential for assessing sensory challenges over time, providing a more comprehensive view than brief clinical observations alone10 . However, clinical observation may miss subtle or context-dependent sensory processing issues10 .
SPD remains a debated diagnosis with no consensus on formal diagnostic criteria. Professional organizations have expressed caution about recognizing SPD as a standalone diagnosis due to overlap with other neurodevelopmental disorders10 . Misdiagnosis of SPD instead of autism spectrum disorder can delay access to appropriate interventions10 . Some children may show improvement in sensory processing with age, complicating the diagnostic process10 .
Sensory Processing Disorder Treatments
There is currently no cure for SPD, but various treatments aim to improve sensory integration and help individuals adapt to sensory input4 . Occupational therapy using sensory integration techniques is the primary evidence-based treatment11 . Individualized treatment plans are essential to address each child's unique sensory challenges and functional goals11 .
Sensory integration therapy involves sensory play activities such as tactile exploration, swinging, or spinning to help the brain process sensory information more effectively11 . Therapeutic tools like weighted vests and sensory swings are commonly used to provide calming or organizing sensory input11 . Emerging research explores neuromodulation techniques and virtual reality interventions as adjunctive therapies to enhance sensory processing and engagement1 .
Supportive Techniques
Behavioral strategies can help manage sensory overload and reduce emotional outbursts. Using calm, clear communication helps soothe children experiencing sensory distress5 . Environmental modifications, such as dimming lights, providing noise-canceling headphones, and scheduling sensory breaks, support better regulation6 . Routine sensory activities at home and school can improve focus and participation1 .
Supportive Treatment Approaches:
- Occupational therapy with sensory integration techniques11
- Use of weighted vests, sensory swings, and fidget tools11
- Behavioral strategies to manage overload and meltdowns5
- Environmental modifications like lighting and noise control6
- Emerging neuromodulation and virtual reality therapies1
“Sensory integration therapy provides essential sensory input and experiences that help individuals learn to adapt. It typically involves doing specific sensory activities tailored to needs, which help regulate sensory responses.”
— Stanley Greenspan, DIR Floortime3
Conditions Related to SPD
SPD frequently co-occurs with neurodevelopmental disorders such as autism spectrum disorder and ADHD12 . Sensory processing difficulties affect up to 90% of children with autism and about 50% of those with ADHD13 . SPD symptoms are also elevated in youth diagnosed with disruptive mood dysregulation disorder (DMDD), who often show sensory avoidance behaviors14 . Integrated treatment approaches that address both mood and sensory symptoms improve outcomes in these populations14 .
Sensory processing difficulties are common in children and adolescents with anxiety and obsessive-compulsive disorder (OCD) as well, though the relationship requires further investigation15 . SPD can complicate diagnosis and treatment when it overlaps with these related conditions, highlighting the need for comprehensive assessment.
Living With Sensory Processing Disorder
Living with SPD can be challenging for both affected individuals and their families. Sensory processing difficulties often increase family stress and complicate daily routines5 . Caregivers benefit from social support networks, including parent support groups and online communities, which provide valuable resources and emotional support5 . Creating predictable environments and using sensory aids like headphones and sunglasses can help manage symptoms5 .
SPD symptoms may improve with age for some individuals, but others experience lifelong challenges that impact functioning and quality of life10 . Advocacy for appropriate accommodations at school and work is important to ensure the best possible outcomes1 . Occupational therapists play a key role in helping individuals develop coping skills and adapt to sensory challenges throughout life6 .
Sensory processing disorder affects how individuals experience the world, making everyday sensations either overwhelming or underwhelming. Therapy and supportive strategies can help manage these differences and improve daily functioning1 5.
Frequently Asked Questions
Is Sensory Processing Disorder the same as autism?
SPD is distinct from autism spectrum disorder, although they often co-occur. Sensory processing difficulties are highly prevalent among children with autism but can also occur independently1 .
Can SPD be diagnosed with brain scans?
Currently, neuroimaging is primarily a research tool and is not routinely used for clinical diagnosis of SPD. Diagnosis relies on clinical observation and caregiver reports10 9.
What treatments are available for SPD?
Occupational therapy using sensory integration techniques is the main treatment. Emerging therapies like neuromodulation and virtual reality are being studied but are not yet standard1 11.
Can SPD improve over time?
Some children show improvement in sensory processing with age, but others may have lifelong symptoms requiring ongoing support10 .
