Sensory development is key to human development. Everything that humans do is dependent upon utilising their senses.
Without effective and reliable references and representative management, the brain would be unable to function. The senses mediate how the human experiences, interprets, and is able to make 'sense' of his or her world. This activity of 'appeasement' or interpretation, that the human senses manages for the brain, is called sensory processing.
Sensory Processing is literally the process that humans use to interpret the meaning of the sensations they experience. Literally, when a child discovers a new object, explores that object in a way that engages the senses. The child creates a new neural pathway in the brain that it can relate to later in reference to the object.
The more often the child stimulates his or her senses through interaction with his or her environment, the more neural pathways will be created; the more likely old neural pathways will be reinforced.
SPD - Sensory Processing Disorder is a condition of the human brain in which the sensory processing functions are dysfunctional or unreliable.