SIG 1 Perspectives Forum: Specific Language Impairment/Developmental Language Disorder
Developmental Language Disorder - Boys Town National Research Hospital Web
The causes of Specific Language Impairment
Specific Language Impairment
How common is specific language impairment?
Specific language impairment (SLI) is diagnosed when a child's language does not develop normally and the difficulties cannot be accounted for by generally slow development, physical abnormality of the speech apparatus, autism spectrum disorder, apraxia, acquired brain damage or hearing loss. Twin studies have shown that it is under genetic influence. Although language impairment can result from a single-gene mutation, this is unusual. More commonly SLI results from the combined influence of multiple genetic variants, each of which is found in the general population, as well as environmental influences.