Pervasive developmental disorders (PDD) — now known as autism spectrum disorder (ASD) — refers to a group of conditions that affect average development. It may appear as a delay in development of ...

Autism spectrum disorder has yet to be linked to a single cause, due to the wide range of its symptoms and severity. However, a recent study suggests a promising new approach to finding answers, one ...

People who learn they have autism after age 6 — the current median age at diagnosis — are often described as having a “milder” form of autism than people diagnosed as toddlers. A new study challenges ...