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Pervasive developmental disorder
The diagnostic category
pervasive developmental disorders
(
PDD
), as opposed to
specific developmental disorders
(SDD), refers to a group of five
disorder
s characterized by delays in the development of multiple basic functions including
socialization
and
communication
. The pervasive developmental disorders are
pervasive developmental disorder not otherwise specified
(PDD-NOS), which includes atypical autism and is the most common;
autism
, the best-known, now understood to be part of a
spectrum
;
Asperger syndrome
;
Rett syndrome
; and
childhood disintegrative disorder
(CDD).
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