From yee Wiki:
Sensory integration therapy is based on A. Jean Ayres' theory of Sensory Integration. Ayres' Sensory Integration (ASI) is a theory that describes:
(1) how the neurological process of processing and integrating sensory information from the body and the environment contribute to emotional regulation, learning, behavior, and participation in daily life.
(2) empirically derived disorders of sensory integration and an intervention approach. “Sensory integration theory is used to explain why individuals behave in particular ways, plan intervention to ameliorate particular difficulties, and predict how behavior will change as a result of intervention."
Sensory integration theory originated from the work of A. Jean Ayres, PhD, OTR, an occupational therapist and psychologist, whose clinical insights and original research revolutionized occupational therapy practice with children.
Dr. Ayres wrote "Sensory Integration is the organization of sensations for use. Our senses give us information about the physical conditions of our body and the environment around us...The brain must organize all of our sensations if a person is to move and learn and behave in a productive manner."