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pervasive developmental disorder
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pervasive developmental disorder

pathology
Also known as: PDD
Written by
Kara Rogers
Kara Rogers is the senior editor of biomedical sciences at Encyclopædia Britannica, where she oversees a range of content from medicine and genetics to microorganisms. She joined Britannica in 2006 and...
Kara Rogers
Fact-checked by
Britannica Editors
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
Britannica Editors
History

pervasive developmental disorder (PDD), term historically used in reference to any of a group of conditions characterized by early-childhood onset and varying degrees of impairment of language acquisition, communication, social behavior, and motor function. In 2013 pervasive developmental disorders (PDDs) were reclassified as autism spectrum disorders (ASDs).

Five types of PDDs were once recognized: autism, Asperger syndrome, pervasive developmental disorder not otherwise specified (PDD-NOS), childhood disintegrative disorder (CDD), and Rett syndrome. Most PDDs were characterized by deficits in a child’s ability to interact socially and by one or more instances of atypical childhood development.

Kara Rogers