Lecture 14 Pervasive Development Disorders .doc

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11 Apr 2012
Lecture 14: Pervasive Developmental Disorders
What is PDD?
chronic disabilities, attributed to mental or physical impairments or a combina-
manifested before before age of twenty two
results in functional limitations
What are the types of PDD?
Autism (AD)
Aspergers syndrome (AS)
PDD not otherwise specified (PDD-NOS)
Rett’s syndrome
Childhood schizophrenia
What is Autism characterized by?
extreme social withdrawal
cognitive impairments
deficit in verbal and non verbal communication
resistance to environmental changes
abnormal sensory perception
usually evident before age three
What is the Prevalence?
20 in 10000 Canadians
What are the characteristics in Aspergers Syndrome?
deficiencies in social skills
repetitive activities and interests
higher intelligence and communication skills
relatively normal language development
What is the prevalence?
5 in 10000 canadians
conditions which represent a significant delay in the process of development in
areas such as reciprocal social interaction or restricted activities and interests
that does not fit into any of other diagnostic categories
What is the prevalence?
15 in 10000 Canadians
Retts syndrome is characterized by?
significant regression after normal development for 5 months to 4 years
sever deficits in language and cognitive ability
Example: repetitive hand movement
What is the prevalence of rett’s Syndrome?
1 in 10000 Canadians
much more prevalent in females
How is Childhood schizophrenia characterized?
psychotic behavior manifested by loss contact with reality, distorted thought
processes, and abnormal perceptions
When do they occur?
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