As mentioned earlier, the term "Pervasive Developmental Disorders" is now less commonly used, and the conditions are grouped under the umbrella term "Autism Spectrum Disorders" (ASD). The three main disorders within the ASD category are:
Autism Spectrum Disorder (ASD) - This encompasses the features of classic autism and other pervasive developmental disorders.
Asperger's Syndrome (sometimes considered a subtype of ASD) - Individuals with Asperger's typically have average or above-average intelligence and milder symptoms than classic autism.
Childhood Disintegrative Disorder (CDD) - A rare condition where a child experiences a significant loss of previously acquired skills, such as language and social abilities, after a period of normal development.