The autism spectrum or autistic spectrum encompasses a range of neurodevelopmental conditions, including autism and Asperger syndrome, generally known as autism spectrum disorders or autistic spectrum disorders (ASD). Individuals on the autistic spectrum typically experience difficulties with social communication and interaction and may also exhibit restricted, repetitive patterns of behavior, interests, or activities. Symptoms are typically recognized between one and two years of age in boys. However, many children are not diagnosed until they are older. It is also common for diagnosis to be received as an adolescent or as an adult. The term "spectrum" refers to the variation in the type and severity of symptoms. Those in the mild range are typically able to function independently, with s