PDD, Pervasive developmental disorder entities

PDD, as opposed to specific developmental disorders (SDD)
It is a group of disorders characterized by delays in the development of multiple basic functions including socialization and communication.

Autism
Asperger syndrome (9% of autism diagnoses)
PDD-NOS (47% of autism diagnoses)
Childhood disintegrative disorder (CDD)
Overactive disorder associated with mental retardation and stereotyped movements
Rett syndrome

The first four of these disorders are commonly called the autism spectrum disorders (ASD ); the last disorder is much rarer, and is sometimes placed in the autism spectrum and sometimes not.

The terminology PDD and ASD is often used interchangeably and varies depending on location

Symptoms of PDD may include behavioral and communication problems such as:

Difficulty using and understanding language
Difficulty relating to people, objects, and events (Lack of eye contact, Pointing behavior, Lack of facial responses)
Unusual play with toys and other objects
Paranoia, a characteristic form of social anxiety, Derealization, Transient psychosis, and unconventional beliefs if environment or routine are changed without notice
Repetitive body movements or behavior patterns, such as hand flapping, hair twirling, foot tapping, or more complex movements^{[citation needed]}
Difficulty regulating behaviors and emotions, which may result in temper tantrums, anxiety, and aggression
Emotional breakdowns
Delusional or unconventional perception of the world
Maladaptive daydreaming
Mirrored-Self Misidentification – the delusion that the individual in the mirror that you are, is a child, even though you are an older teen or an adult
An association between high-functioning autism (HFA) and criminal behavior is not completely characterized.

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