The diagnostic category of pervasive developmental
disorders (PDD) refers to a group of disorders characterized by
delays in the development of socialization and communication skills.
Parents may note symptoms as early as infancy, although the typical
age of onset is before 3 years of age. Symptoms may include problems
with using and understanding language; difficulty relating to
people, objects, and events; unusual play with toys and other
objects; difficulty with changes in routine or familiar surroundings,
and repetitive body movements or behavior patterns. Autism (a
developmental brain disorder characterized by impaired social
interaction and communication skills, and a limited range of activities
and interests) is the most characteristic and best studied PDD.
Other types of PDD include Asperger's Syndrome, Childhood Disintegrative
Disorder, and Rett's Syndrome. Children with PDD vary widely in
abilities, intelligence, and behaviors. Some children do not speak
at all, others speak in limited phrases or conversations, and
some have relatively normal language development. Repetitive play
skills and limited social skills are generally evident. Unusual
responses to sensory information, such as loud noises and lights,
are also common.
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