Individual differences in language performance after cochlear implantation at one to three years of age: child, family, and linguistic factors.

Language skills were investigated in a multicultural sample of 13 prelingually deaf children (11 profoundly deaf from birth) who received cochlear implants between 14 and 38 months of age; average duration of implant use was 49 months. Individual postimplant language skills ranged from extremely delayed to age appropriate. On average, skills varied across domains: on vocabulary, several children functioned in the average range compared with hearing peers, but all were below that range on a test emphasizing syntax (CELF-P). Children with preimplant hearing experience had the highest scores on all language measures. Excluding these children, age of implantation (range 14 to 27 months) associated inversely and significantly with CELF-P scores, even when nonverbal IQ was controlled. Qualitative analyses indicated higher child language achievement associated with parents' reports of lengthy, in-depth processes to decide about cochlear implantation. Such reports may indicate high levels of ongoing parent involvement with child and programming.