Maternal Interactions With a Hearing and Hearing-Impaired Twin: Similarities and Differences in Speech Input, Interaction Quality, and Word Production PurposeThis study examined a mother’s speech style and interactive behaviors with her twin sons: 1 with bilateral hearing impairment (HI) and the other with normal hearing (NH).MethodThe mother was video-recorded interacting with her twin sons when the boys were 12.5 and 22 months of age. Mean F0, F0 range, duration, ... Article
Article  |   June 01, 2010
Maternal Interactions With a Hearing and Hearing-Impaired Twin: Similarities and Differences in Speech Input, Interaction Quality, and Word Production
 
Author Affiliations & Notes
  • Christa Lam
    MARCS Auditory Laboratories, University of Western Sydney, New South Wales, Australia
  • Christine Kitamura
    MARCS Auditory Laboratories, University of Western Sydney, New South Wales, Australia
  • Contact author: Christa Lam, MARCS Auditory Laboratories, Building 5, Bankstown Campus, University of Western Sydney, Locked Bag 1797, Penrith South DC, New South Wales 1797, Australia. E-mail: c.lam@uws.edu.au.
Article Information
Hearing & Speech Perception / Hearing Disorders / Speech, Voice & Prosody / Hearing
Article   |   June 01, 2010
Maternal Interactions With a Hearing and Hearing-Impaired Twin: Similarities and Differences in Speech Input, Interaction Quality, and Word Production
Journal of Speech, Language, and Hearing Research, June 2010, Vol. 53, 543-555. doi:10.1044/1092-4388(2010/09-0126)
History: Received June 22, 2009 , Accepted January 31, 2010
 
Journal of Speech, Language, and Hearing Research, June 2010, Vol. 53, 543-555. doi:10.1044/1092-4388(2010/09-0126)
History: Received June 22, 2009; Accepted January 31, 2010
Web of Science® Times Cited: 20

PurposeThis study examined a mother’s speech style and interactive behaviors with her twin sons: 1 with bilateral hearing impairment (HI) and the other with normal hearing (NH).

MethodThe mother was video-recorded interacting with her twin sons when the boys were 12.5 and 22 months of age. Mean F0, F0 range, duration, and F1/F2 vowel space of the corner vowels /i/, /u/, and /a/ were compared in her infant-directed (ID) and adult-directed (AD) speech. The interactions were also coded for emotional availability, and vocabulary size was collected at 17 and 22 months.

ResultsAcoustic analyses revealed no difference among mean F0, F0 range, and duration between the twins. In contrast, when the corner vowels were plotted in F1/F2 vowel space, the results showed a diminished vowel space in speech to the HI twin compared to the NH twin. Ratings of emotional availability were lower for the HI than the NH twin, but the HI twin had a larger expressive vocabulary on both occasions, albeit in the lower percentile.

ConclusionsThe mother appears more focused on maintaining the attention of the HI infant using the typical ID exaggerations to prosody and overlooking linguistic features such as the hyperarticulation of her vowels. The results have implications for early intervention strategies.

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