Lip Movement Exaggerations During Infant-Directed Speech

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Authors
Green, Jordan R.
Nip, Ignatius S. B.
Wilson, Erin M.
Mefferd, Antje S.
Yunusova, Yana
Advisors
Issue Date
2010-12
Type
Article
Keywords
Infant-directed speech , Speech development , Lip movement , Facial movement , Motion capture
Research Projects
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Journal Issue
Citation
Green, Jordan R.; Nip, Ignatius S. B.; Wilson, Erin M.; Mefferd, Antje S.; Yunusova, Yana. 2010. Lip Movement Exaggerations During Infant-Directed Speech. Journal of speech, language, and hearing research: JSLHR, v. 53 no.6 pp.1529-1542
Abstract

Purpose

Although a growing body of literature has indentified the positive effects of visual speech on speech and language learning, oral movements of infant-directed speech (IDS) have rarely been studied. This investigation used 3-dimensional motion capture technology to describe how mothers modify their lip movements when talking to their infants.

Method

Lip movements were recorded from 25 mothers as they spoke to their infants and other adults. Lip shapes were analyzed for differences across speaking conditions. The maximum fundamental frequency, duration, acoustic intensity, and first and second formant frequency of each vowel also were measured.

Results

Lip movements were significantly larger during IDS than during adult-directed speech, although the exaggerations were vowel specific. All of the vowels produced during IDS were characterized by an elevated vocal pitch and a slowed speaking rate when compared with vowels produced during adult-directed speech.

Conclusion

The pattern of lip-shape exaggerations did not provide support for the hypothesis that mothers produce exemplar visual models of vowels during IDS. Future work is required to determine whether the observed increases in vertical lip aperture engender visual and acoustic enhancements that facilitate the early learning of speech.

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Publisher
PubMed
Journal
Book Title
Series
Journal of speech, language, and hearing research: JSLHR;v. 53 no.6
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DOI
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