What Is Sensory Processing Disorder (SPD)?

Sensory processing occurs when the brain receives and organizes information from external sources, such as light or sound, and internal bodily cues, such as hunger or balance. Individuals with Sensory Processing Disorder (SPD) do not respond to this everyday sensory information the same way most people do. They may feel bombarded or assaulted by even the smallest bit of stimulation, or they might be unable to recognize even very extreme sensations or changes in their environment. Studies suggest as many as 1 in 20 people have sensory processing issues, and symptoms are typically much more pronounced in children.

SPD is generally broken down into the three patterns and thirteen subtypes listed below. Keep in mind the exact symptoms will vary greatly from one individual to the next. Many people with SPD demonstrate a combination of sensitivities and seeking/avoiding behaviors, depending on their level of arousal and how familiar they are with their current environment.

Pattern 1: Sensory Modulation Disorder (SMD)

Sensory Over-Responsivity – Over-responsive individuals, or avoiders, are highly sensitive to sensory input and may have extreme reactions to mild stimulation. For example, they might cry out in pain while brushing their hair or gag at very faint smells. Avoiders often feel overloaded and overwhelmed by everyday situations. As a result, they tend to appear anxious, withdrawn, or defensive.

Sensory Under-Responsivity – Under-responsive individuals have difficulties detecting and/or responding to sensory input in a timely manner. They might not notice that the lighting or temperature in the room has changed, for example, or that they’ve bumped into something and injured themselves. As a result, under-responsive individuals often appear distracted, dismissive, or clumsy.

Sensory Craving – Sensory cravers, or seekers, seem to have an inexhaustible appetite for stimulation. However, they tend to become more keyed up and deregulated as they take in more input. Seekers usually demonstrate behaviors associated with Attention Deficit Hyperactivity Disorder (ADHD), such low impulse control and constant moving, fidgeting, bumping into things, or fiddling with objects.

Pattern 2: Sensory-Based Motor Disorder (SBMD)

Postural Disorder – Postural disorder affects the body’s ability to stabilize itself and maintain a sense of balance. Individuals with this subtype often have problems slouching or bad posture. They might also appear to be weak, move awkwardly, or have extremely low endurance.

Dyspraxia (Motor Planning Problems) – Those with dyspraxia have difficulty planning and performing new, nonhabitual gross and fine motor tasks. They might appear to have extremely poor hand-eye coordination, problems with concentration, and take much longer than their peers to learn a new skill.

Pattern 3: Sensory Discrimination Disorder (SDD)

Individuals with this pattern have difficulty recognizing and interpreting sensory information. They’re often unable to gauge the physical differences between objects, such as size, color, shape, or distance. They might be unaware of the pressure or force they’re exerting at a given moment and appear awkward, clumsy, and prone to spilling drinks or breaking toys. SDD is further broken down into eight subtypes, one for each sensory system. Click on the links below to take a deeper dive into each of these systems.

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