Abstract
Infant-directed speech includes higher pitch overall and more exaggerated pitch contours compared to adult-directed speech. Clear speech is characterized by increased duration and expanded vowel space compared to conversational speech. This study investigated the differences between mothers’ speech to children with cochlear implants versus normal-hearing children in terms of acoustic characteristics associated with infant-directed speech and clear speech. Ten mothers of children with cochlear implants, 12- months postimplantation, and 25 mothers of normal-hearing, 12-month-old children were recorded during a 5-min play session between mother and child. Pitch range, vowel duration, and vowel space in mothers’ speech to children with cochlear implants and normal-hearing children were examined. Results are discussed in terms of differences between groups depending upon the hearing status of the child, and in terms of the acoustic characteristics of infant-directed speech and clear speech directed toward hearing-impaired listeners. [Work supported by NIH-NIDCD Training Grant T32DC00012 to Indiana University and NIH-NIDCD Research Grant R21DC06682 to the Indiana University School of Medicine, HUG grant Butler University.]
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