Autism is a brain development disorder that is characterised by impaired social interaction and communication, and also by restricted and repetitive behavior. These signs of autism usually become noticable before a child is three years old. It affects many parts of the brain, and how it occurs is still not understood. Genetics are strong when dealing with autism, although genetics of autism are very complex and it is unclear weather it is by rare mutations, or by rare combinations of common genetic variants.

The characteristics of austism first appear during infancy or childhood, and generally follows a steady course without remission. Symptoms generally start to begin after the age of six months, and become established by age two or three, and they tend to continue through adulthood. Autism has a characteristic traid of symptoms such as:
Austism is one of the five types of austism spectrum disorders. Autism spectrum disorders are developmental brain disorders that are characterized by impaired social interaction and communication skills, wit a limited rance of activities and interests.Austism is a complex development disability with many different levels of severity, with technically one diagnosis that is autism.

Autism is the second leading childhood developmental disorder and it is considered the most severe of the different tpes of autism disorders. Calssic autism causes people to develop language late, have difficulties talking with other people, or a profound lack of attention with others. People with autism have an intense wish for the same routines, muteness or abnormality of speach, high levels of visio spatial skills, but major learning difficulties in other areas.
Asperger syndrone also referred to as AS, is a developmental disorder. It is a autism spectrum disorder that is one of a distinct group of neurological conditions characterized by a greater or lesser degree or impairment in language and communication skills, and repetitive and restrictive patterns of behavior. A person with seperger syndrone can exhibit a variety of characteristics and their disoirders can range from mild to severe. Children show dificiencies in social skills and have difficulties with transitions or changes. They will often cling to rituals and get upset over any changes. People with asperger syndrome have difficulties reading body language and determining the proper body space. Some children have the reduced sensitivity to pain, but increased sensitivity to bright lights and load noises.

Rett syndrome is a relatively rare condition that almost exclusively affects females, occuring in every 10,000 to 15,000 people. Rett sydrome is part of a category of disorders known as pervasive development disorders PDD.
Symptoms of Rett syndrome initially go thought a period of development that lasts between 6 and 18 months. After this autsim like sydrome begin to appear. Little girls mental and social development regresses, and they no longer respond to parents and they tend to pull away from social contact. Some problems associated with
Childhood Disintegrative Disorder
This indicates severe regression in communication skills, social behavior, and all developmental motor skills. in the begining these children can seem perfectly normal, untill they start to regress at the ages between 2 and 4. Once the disorders has regressed these children will stop socializing, lose potty training skills, stop playing, lose motor skills and stop making friends.
Pervasive Development Disorder
This describes people who have many or all different types of autism disorders. Children with PDDNOS do not fully meet the criteria of symptoms used to diagnose any of the other types of autism, and they do not have the degree of impairment described in any of the other types of autism.
my name is carmen i was told tht my son has autistic disorder the actve type what does ths mean