Purpose: To examine the validity of the MacArthur-Bates Communicative Development Inventories (CDI) for measuring language abilities in children with profound hearing loss who are using cochlear implants. Method: Twenty-four children with cochlear implants and their mothers participated in this study. Children ranged in age from 32 months to 86…

Children with Down syndrome (DS) have cognitive disabilities resulting from trisomy 21. Language-learning difficulties, especially expressive language problems, are an important component of the phenotype of this population. Many individuals with DS are born into bilingual environments. To date, however, there is almost no information available…