Severe impairment of both expressive and receptive language as well as physical movement.Poorly coordinated gait or trunk movements.Loss of purposeful hand movements between five and ten months of age with subsequent development of a stereotyped hand movement that resembles hand wringing or hand washing.

Normal development through the age of five months and then loss of skills.Symptoms first appear after the age of five months, with the condition usually being diagnosed in the first four years of life.Profound to severe retardation is most likely to occur.This disorder is only reported in females.The following is a brief summary regarding each of these types. Numerous excellent resources are available that completely describe each of these types of PDD. These vary primarily according to the age at which the behaviors are first observed. Within this broad category of PDD, there are four different types of disorders. Although the specific cause of PDD is not known, it is often associated with other medical conditions, such as chromosomal abnormalities, congenital infections, and structural abnormalities of the central nervous system. These conditions are all generally noted early in life and often associated with an additional diagnosis of mental retardation. PDD is also accompanied by a variety of unconventional self-stimulatory behaviors. Pervasive Developmental Disorder is a psychiatric/psychological term for a broad category of disorders characterized by disturbed patterns of social interaction and language. VersiГіn EspaГ±ol de este artГculo (Spanish Version)Д«y Marnee Loftin, Psychologist, Texas School for the Blind and Visually Impaired

Pervasive developmental disorder causes