What characterizes Sensory Processing Disorder (SPD) concerning the required amount of sensory input?

Answer

It can manifest as sensory under-responsivity, requiring more input to register anything.

SPD manifests in different ways, including sensory over-responsivity (SOR) or sensory under-responsivity, where a person needs more input to register anything at all.

What characterizes Sensory Processing Disorder (SPD) concerning the required amount of sensory input?
causeSensoryperceptionsymptomoverload