ensory processing refers to our ability to take in information through our senses (touch, movement, smell, taste, vision, and hearing), organize and interpret that information, and make a meaningful response.
There are also two hidden senses called Proprioception and Vestibular. Your vestibular sense is telling you right now how to hold your head just right to be able to read this information. Proprioception is the information your body receives from muscles and joints. For example, as you sit in front of the computer, your fingers are being given information on how much force is needed for key typing and how to hold your head at the right angle for viewing.
For most people, this process is automatic. Children who have a sensory processing disorder, however, don’t experience such interactions in the same way. SPD affects the way their brains interpret the information that comes in; it also affects how they respond to that information with emotional, motor, and other reactions.
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From Sensory Processing Disorder Recovery Resources: