AIT(Auditory integration training) is a special music therapy that corrects sound processing disorders of the auditory system and stimulates brain activities by a group of filtered and modulated music, so as to treat autism, pervasive developmental disorders (PDD), central auditory processing disorder (CAPD), attention deficit hyperactive disorder (ADHD), attention deficit disorder (ADD), dyslexia, hyperactivity, language impairments, and learning disabilities (LD), etc.