types of autism
Over time, psychiatrists have developed a systematic way of describing autism and related conditions. All of these conditions are placed within a group of conditions called pervasive developmental disorders (PDD). Within PDDs, is the autism spectrum disorder (ASD). The basic core features of all ASDs include problems with basic socialization and communication, strange intonation and facial expressions, and intense preoccupations are repetitive behaviors; however, one important aspect of what makes autism so complex is the wide variation in expression of the disorder (Lord, 2011). Also with ASD there are categories that includes the following: Autistic disorder, Pervasive developmental disorder, and Asperger’s syndrome Bogdashina, (2006).
In the Autistic Disorder these children with autistic disorder that cannot use verbal or non-verbal communication to interact effectively with others. Children, usually with autistic disorder have severe delays in learning language, and they also have certain interest in objects or information. Children may perform certain behaviors repeatedly. To be diagnosed with autistic disorder, symptoms must have been noted before age 3.
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There are other conditions that have to deal with sharing the symptoms of PDDs and ASDs and that is the Rett Syndrome where the children that have this are in a rare condition they start to begin with normal development from the birth through about 5 months of their age. However when they are about 5 to 48 months of age, head circumference that develops slow. Children that lose there motor skills they have social interaction and language and their development becomes impaired.
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Also there is Childhood disintegrative disorder Like Rett syndrome, children start developing normally. However, from about age 2 to age 10, the children are increasingly less able to interact and communicate with others. At the same time, children develop repetitive movements and obsessive behaviors and interests. They lose motor skills, too. This usually leads to them becoming disabled. This autism-like condition is the rarest and most severe in autism spectrum disorder. (Anderson, 2006)
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Another one is pervasive developmental disorder, not otherwise specified (PDD-NOS): Children diagnosed with “atypical autism” are included in the group. Children with PDD-NOS have symptoms that do not exactly fit those of autistic disorder or any other ASD. For example, the symptoms may have developed after age of 3. Symptoms may not be severe enough to be considered an autistic disorder. Thirdly, is Asperger's syndrome: Children with Asperger's syndrome may display many of the same symptoms as children with autistic disorder. However, they usually have average or above-average intelligence and initially show normal development of language. They often want to be social with others but don’t know how to go about it. They may not be able to understand others' emotions. They may not read facial expressions or body language well. Their symptoms may not become apparent until school, when behavior and communication with peers become more important Bogdashina, (2006).