Sensory integration therapy (SIT) was originally developed by occupational therapist A. Jean Ayres in the 1970s to help children with sensory-processing difficulties. It was specifically designed to treat Sensory Processing Disorder (sometimes called Sensory Integrative Dysfunction). Sensory Integration Therapy is based on A. Jean Ayres's Sensory Integration Theory, which proposes that sensory-processing is linked to emotional regulation, learning, behavior, and participation in daily life. Sensory integration is the process of organizing sensations from the body and from environmental stimuli. Theoretical concept A. Jean Ayres' sensory integration theory describes the following: 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. Empirically derived disorders of sensory integration. Intervention approaches and strategies for sensory input. 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. Dr. Ayres defines sensory integration as the organization of an individual's senses for use. The brain must organize all of sensations if a person is to move, learn, and behave in a productive manner. Individuals with sensory-processing difficulties often experience delayed or impeded typical behaviors and functioning as a result of interferences in neurological processing and integration of sensory inputs. Sensory dysfunction affects the neurological processing of sensory information and sensory systems which causes negative impacts on learning and development. ASI highlights the critical influence that sensory-processing has on a child's growth and development. It contributes to the understanding of how sensation affects learning, social-emotional development, and neurophysiological processes, such as motor performance, attention, and arousal. ASI has been studied by different professions on diverse levels, such as by occupational therapists and researchers as a foundation for occupational performance and participation, and by psychologists on a cellular level as multi-sensory integration. As an intervention approach, it is used as "a clinical frame of reference for the assessment and treatment of people who have functional disorders in sensory processing". Practice Individuals with sensory processing disorder or sensory integrative dysfunction experience problems with their sensory systems, also known as basic senses of touch, smell, hearing, taste, sight, body coordination, and movement against gravity. They might also experience difficulties in movement, coordination, and sensing where one's body is in a given space. ASI focuses on three main sensory systems - vestibular, proprioceptive, and