In the last ten years, a number of peer-reviewed studies have demonstrated the elevated incidence of attention deficit hyperactivity disorder (ADHD) symptoms within populations of children diagnosed with autism, autism spectrum disorder (ASD), Asperger’s syndrome and pervasive developmental disorder not otherwise specified as defined by the Diagnostic and Statistical Manual of Mental Disorders, fourth edition and fifth edition. Previous research conducted by our group and others has, for example, found a significant overlap between ASD and ADHD.