Speech, for most of us, is a bimodal percept whenever we both hear the voice and see the lip movements of a speaker. Children who are born deaf never have this bimodal experience. We tested children who had been deaf from birth and who subsequently received cochlear implants for their ability to fuse the auditory information provided by their implants with visual information about lip movements for speech perception. For most of the children with implants (92%), perception was dominated by vision when visual and auditory speech information conflicted. For some, bimodal fusion was strong and consistent, demonstrating a remarkable plasticity in their ability to form auditory-visual associations despite the atypical stimulation provided by implants. The likelihood of consistent auditory-visual fusion declined with age at implant beyond 2.5 years, suggesting a sensitive period for bimodal integration in speech perception.auditory visual integration ͉ deafness ͉ learning ͉ sensitive periods ͉ speech development

The findings regarding age reinforce the importance of early detection and intervention for children's positive quality of life with cochlear implants later in childhood.

This study explored the language skills of children with cochlear implants (CIs) compared to normal hearing (NH) peers. Standardized speech and language measures, including speech articulation, receptive and expressive vocabulary, syntax and morphology, and metalinguistics, were administered to 39 congenitally deaf children, ages 5 to 14, and a matched sample of NH children. Many CI children demonstrated age-appropriate scores on several language measures, yet their performance was significantly lower than NH peers. Results indicated that (a) age at implant predicted significant variance in receptive vocabulary and short-term auditory memory performance, and (b) duration of CI use predicted receptive syntax performance.

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