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 disorders (ASD) are a diverse group of conditions, related to brain development and marked by difficulty with social interaction, communication, and atypical patterns of activities, ...

Autism spectrum disorder, or ASD, is the clinical name for the condition most people refer to as autism. Autism is defined as "a complex developmental condition that affects communication, social ...

Autism spectrum disorder (ASD) is a developmental disability with symptoms that vary widely from person to person. Children and adults with ASD may learn, socialize, and move through the world ...