Abstract
The concept of specific language impairment (SLI) is discussed and abandoned in view of recent research. The co-morbidity of developmental language impairments and other neurodevelopmental disorders (for example, deafness), show that language difficulties are rarely specific to language. However, high rates of heritability warrant an inquiry into the genetic etiology of developmental language impairment. Language is a polygenetic trait and depends on a cluster of genes; some of them are controlled by the FOXP2 gene. Early interactions between child and caregiver show the instinct to learn language and also the epigenetic reasons for developmental language impairments. The chapter discusses how developmental language impairment can be distinguished from other neurodevelopmental disorders, particularly Asperger syndrome.
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Lian, A. (2016). Developmental Language Impairment: Conceptual Issues and Prospects of an Evolutionary Approach. In: Language Evolution and Developmental Impairments. Palgrave Macmillan, London. https://doi.org/10.1057/978-1-137-58746-6_2
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DOI: https://doi.org/10.1057/978-1-137-58746-6_2
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