Autism spectrum disorder
Autism is one of a group of serious developmental problems called autism spectrum disorders that appears in early childhood usually before the age 3. The symptoms and severity vary in children. Autism is the most common of the pervasive developmental disorders with a prevalence of 10 to 12 children per 10,000 children. (Bryson & Smith, 1998).
The term “spectrum” refers to the wide range of symptoms, skills, and levels of impairment or disability that children with Autism Spectrum Disorder can experience. Some children are mildly impaired by their symptoms, while others are severely disabled. The latest edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) no longer includes Asperger’s syndrome.
The characteristics of Asperger’s syndrome are included within the broader category of all autism spectrum disorders affect a child’s ability to communicate and interact with others. Autism Spectrum Disorder is a developmental condition which affects individuals in two main areas.
These individuals have impaired communication and social interaction and the Individuals have restricted or repetitive patterns of behavior or interests (Frith &Waltz, 2005).
Speech and language therapy is an intervention based therapy which is used for the enhancement of communication through different ways such as sign language, discrete trial and error format, visual support and natural learning setup which is called milieu. Numbers of studies compared the effect of teaching expressing language by the use of speech, sign or total communication input (Barrera & Azaroff , 1980)