Korean Mothers’ Speech to Young Children with Cochlear Implants in Parent-Child Interaction

Objectives: Infant-directed speech is the particular form of spontaneous speech observed in interactions between parents and their young children. There are reasons to believe that infant-directed speech may help to make language acquisition easier for young children. Thus, this study investigates the effects of cochlear implantation on mothers’ speech to their young children. Methods: Fourteen children with cochlear implants (CIs) and 14 agematched children with normal hearing (NH), aged 12 to 35 months, participated in this study. We recorded mothers’ utterances through a parent-child interaction task. Mothers’ speech features such as fundamental frequency, utterance length, speech rate, and pause duration were measured across speech samples. Results: There were no significant differences between the CI and NH groups in fundamental frequency, utterance length, and pause duration variables. However, the speech of mothers in the CI group was significantly slower than that of the NH group. Conclusion: Mothers used typical infant-directed speech styles when speaking to their children with CIs. Additionally, mothers of the CI group tended to speak more slowly than mothers of the NH group in the parent-child interactions. Given that the language skills of children with CIs are significantly lower than those of children with NH in this study, mothers of the CI group may speak to their children at a slower rate than those of the NH group to provide their linguistic input more efficiently. These findings suggest that children with CIs are exposed to infant-directed speech with similar acoustic qualities as children with NH.