Background: Fragile X syndrome (FXS) and Down syndrome (DS) are the two leading genetic causes of intellectual disability, and FXS is the most common known genetic condition associated with autism. Both FXS and DS are associated with significant language impairment, but little is known about expressive language across domains over time or the role…

The present study examined narrative development in children and adolescents with Down syndrome longitudinally. Narratives were collected from 32 children and adolescents with Down syndrome three times over a 1-year period. Both micro- and macrolevel analyses were conducted. Significant growth over the 1-year period was seen in semantic complexity…

This study, involving 48 children and adolescents with Down's syndrome, found that chronological age and mean mental age collectively accounted for much of subjects' variability in vocabulary comprehension and syntax comprehension, with total passes on a hearing screening accounting for additional variability. (Author/DB)