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Phonetic variation in consonants in infant-directed and adult-directed speech: the case of regressive place assimilation in word-final alveolar stops*

Published online by Cambridge University Press:  07 February 2013

LAURA C. DILLEY*
Affiliation:
Department of Communicative Sciences and Disorders, Department of Psychology, Department of Linguistics and Germanic, Slavic, Asian and African Languages, Michigan State University
AMANDA L. MILLETT
Affiliation:
Department of Communication Sciences and Disorders, University of Missouri
J. DEVIN MCAULEY
Affiliation:
Department of Psychology, Michigan State University
TONYA R. BERGESON
Affiliation:
Department of Otolaryngology – Head & Neck Surgery, Indiana University School of Medicine
*
Address for correspondence: Dr Laura C. Dilley, Michigan State University, Department of Communicative Sciences and Disorders, 1026 Red Cedar Road, Rm. 116, Oyer Speech & Hearing Building, East Lansing, MI 48824-1220. tel: 517-884-2255; fax: 517-353-3176; e-mail: [email protected]

Abstract

Pronunciation variation is under-studied in infant-directed speech, particularly for consonants. Regressive place assimilation involves a word-final alveolar stop taking the place of articulation of a following word-initial consonant. We investigated pronunciation variation in word-final alveolar stop consonants in storybooks read by forty-eight mothers in adult-directed or infant-directed style to infants aged approximately 0;3, 0;9, 1;1, or 1;8. We focused on phonological environments where regressive place assimilation could occur, i.e., when the stop preceded a word-initial labial or velar consonant. Spectrogram, waveform, and perceptual evidence was used to classify tokens into four pronunciation categories: canonical, assimilated, glottalized, or deleted. Results showed a reliable tendency for canonical variants to occur in infant-directed speech more often than in adult-directed speech. However, the otherwise very similar distributions of variants across addressee and age group suggested that infants largely experience statistical distributions of non-canonical consonantal pronunciation variants that mirror those experienced by adults.

Type
Articles
Copyright
Copyright © Cambridge University Press 2013 

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Footnotes

[*]

This research is supported by NIH-NIDCD R01DC008581 to T. Bergeson. We thank Claire Carpenter, Erin Dixon, Dana Flowerday, Shaina Selbig, Kellie Voss, and Zach Zells for their assistance with data analysis and coding. We also express our gratitude to Jessica Gamache and Evamarie Cropsey for assistance with figures and references, respectively. Moreover, we gratefully acknowledge Chris Heffner, Erin Dixon, Elizabeth Wieland, and Tuuli Morrill for their valuable feedback on an earlier draft of this manuscript.

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