In 1943, Leo Kanner an American psychiatrist first identified AUTISM in a paper he published entitled, “Autistic Disturbances of effective contact”.
In 1944, An Austrian medical student, Hans Asperger, published a paper entitled ‘Die Austistician Psychopathen im Kindesalter’ (Autistic psychopathy in children).
In 1980, according to The American Psychiatric association’s influential Diagnostic and Statistical Manual of Mental Disorders (DSM-III). The term formally known as (infantile Autism) was now classified into these following diagnostic criteria:
1. Lack of responsiveness to orders
2. Impaired language and communication skills.
3. Bizarre responses to aspects of the environment.
4. Early onset (prior to 30 months)
In 1994, the diagnosis of Asperger’s was officially recognized which brought up the edition of the DSM that was published and also those published by the World Health organization in the 10th edition of the International Classification of Disorders (ICD-10) (World Health Organization, 1992, 1993).
Currently, DSM-IV now classified Autism-related-condition into 3 subtypes:
1. Autistic Disorder
2. Asperger Disorder
3. Pervasive Developmental Disorder not otherwise specified (PPD-NOS).