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The term high-functioning autism was used in a manner similar to Asperger syndrome, another outdated classification. The defining characteristic recognized by psychologists was a significant delay in the development of early speech and language skills, before the age of three years. [ 12 ]
A high-functioning group (around 25 percent) whose symptoms more or less overlap with that of what was Asperger syndrome, while also not meeting the then current criteria for autism spectrum disorder, but who completely differ from those with Asperger syndrome in terms of having a lag in language development and/or mild cognitive impairment ...
In 1994, Sally Ozonoff, David L. Strayer, William M. McMahon and Francis Filloux compared information processing skills in high functioning autistics and controls: "The performance of high-functioning autistic children was compared with that of two matched control groups, one with Tourette Syndrome and the other developmentally normal.
Autistic children are less likely to make requests or share experiences and more likely to simply repeat others' words . [105] The CDC estimated in 2015 that around 40% of autistic children do not speak at all. [106] Autistic adults' verbal communication skills largely depend on when and how well speech is acquired during childhood. [102]
Among these measurements, the Autism Diagnostic Interview-Revised (ADI-R) and the Autism Diagnostic Observation Schedule (ADOS) are considered the "gold standards" for assessing autistic children. [ 24 ] [ 25 ] The ADI-R is a semi-structured parent interview that probes for symptoms of autism by evaluating a child's current behavior and ...
The final steps include an Autism Diagnostic Observation Schedule (ADOS) assessment to test an adult’s difficulty with certain tasks and a social-emotional functioning interview, questioning the ...
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There are several justifications for this. Very young children have limited social interaction and communication skills to begin with, so it can be difficult to correctly diagnose milder cases of autism in toddlers. The unspoken assumption is that by the age of five, unusual behaviors will either resolve or develop into diagnosable autism.