Asperger Syndrome
The difference between Asperger syndrome and autism is that there are no problems in language development. In other words, Asperger syndrome is a category of autistic spectrum disorder that is milder than autism. Significant problems in social interaction are also seen in Asperger syndrome. There are also limitations and obsessions in interest and behavior.

Childhood Disintegrative Disorder
Childhood disintegrative disorder begins after the age of two. With the onset of the disorder, previously acquired abilities are rapidly lost. The mental abilities of most children diagnosed with childhood disintegrative disorder decline to the level of severe intellectual disability. Within a few years, these children become very similar to those diagnosed with severe autism. The condition is often accompanied by loss of toilet control and seizures. Childhood disintegrative disorder is very rare. Additionally, the majority of children receiving this diagnosis are boys.

Rett Syndrome
Rett syndrome begins between 6 and 18 months. This syndrome, seen almost exclusively in girls, is inherited. With the onset of the syndrome, all mental, social, communicative and motor skills decline; Additionally, balance disorders occur. There are opinions that it is not right to include Rett syndrome among autistic spectrum disorders.

Atypical Autism
Atypical autism is a general term used for pervasive developmental disorders not otherwise specified (PDD-NOS: Pervasive developmental disorders not otherwise specified). In cases where some features of atypical autism, autism or Asperger syndrome are seen but others are not; In other words, it is the diagnosis made in suspicious cases. For example, in cases of mild autistic symptoms or high-functioning autism characteristics, atypical autism is usually diagnosed.

The first articles about autism were published in the 1940s.
In the 1950s, an opinion was put forward that autism was caused by the mother being 'cold' and 'indifferent', but this view is not valid today.
The first scientific basis for autism emerged in the 1960s.
The first scientific diagnosis and classification studies on autism yielded results in the early 1990s.
In 1992, the American Psychiatric Association clarified the criteria for diagnosing autistic disorders in DSM-IV.
A similar classification was proposed by the World Health Organization in 1993 (ICD-10: International Classification of Diseases).
The first biomedical studies on autism, such as diagnosis and classification studies, were seen in the 1990s.
The term autism has been replaced by the term autistic spectrum disorder over time.
Autism spectrum disorders (ASD) are synonymous with pervasive developmental disorders (PDD) and are used to mean an advanced and complex developmental disability.
It is thought that autistic spectrum disorders arise from neurological causes.
Autistic spectrum disorders are not mental illnesses; However, its symptoms may remind some mental illnesses.
Scientific research has shown that autistic spectrum disorders have no relationship with child-rearing characteristics or the socio-economic characteristics of the family.
There is evidence that autistic spectrum disorders may be hereditary; However, its gene or genes have not yet been found.
According to recent data, autistic spectrum disorders affect approximately one in every 150 children. Additionally, its prevalence in boys is four times higher than in girls.
The majority of individuals with autistic spectrum disorder have different levels of mental retardation.
A minority of individuals with autistic spectrum disorder (about 10%) have very strong memory, musical talent, etc. Superior features are found.

Autism diagnostic criteria according to American Psychiatric Association DSM IV diagnostic criteria
A) At least two from Article 1 and one each from Articles 2 and 3; Presence of a total of 6 or more items from items 1, 2 and 3.
1) qualitative impairment in social interaction, manifested by the presence of at least two of the following:
a) There is a significant deterioration in many non-verbal behaviors such as hand and arm movements made for social interaction, body position taken, facial expressions, eye contact, etc.
b) Inability to develop relationships with peers appropriate to their developmental level
c) not seeking to have fun or spontaneously share one's interests or achievements with other people (e.g., not showing, bringing, or pointing out objects of interest)
2) qualitative impairment in communication, manifested by the presence of at least one of the following:
a) There is a delay in the development of spoken language or the language has not developed at all (it is not accompanied by an attempt to replace it with other means of communication such as hand-arm or facial movements).
b) A significant impairment in initiating or maintaining conversations with others in people who are proficient in speaking
c) using specific language that is stereotyped or repetitive
d) development is flatInability to spontaneously play various imaginary or social imitation-based games
3) limited, stereotyped, and repetitive patterns in behavior, interests, and activities, manifested by the presence of at least one of the following:
a) being trapped in one or more stereotyped and limited patterns of interest that are unusual in terms of the level of involvement or focus
b) strict adherence, without any flexibility, to specific, non-functional, customary routines or ceremonial behavior
c) stereotyped and repetitive motor mannerisms (e.g. finger snapping, hand clapping or twisting, or complex whole body movements)
d) constantly fiddling with parts of objects
B) Delays or unusual functioning before the age of 3 in at least one of the following areas: 1-Social interaction, 2- Language used in social communication, or 3-Symbolic or imaginary play
C) This disorder is not better explained by Rett Disorder or Childhood Disintegrative Disorder.
Pervasive Developmental Disorder Not Otherwise Specified

YGB (BTA)
This category also includes atypical autism. It includes clinical manifestations that do not meet the diagnostic criteria for Autistic Disorder because the age of onset is late, the observed symptoms are atypical, the observed symptoms are insufficient to make a diagnosis, or all of these occur together.

Common Problem Areas
1- Disorder in social interaction
2- Disorder in language, speech and non-verbal communication
3- Repetitive behaviors, limited interests