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Boundary alignment enables 11-month-olds to segment vowel initial words from speech*

Published online by Cambridge University Press:  03 January 2008

AMANDA SEIDL*
Affiliation:
Purdue University, W. Lafayette, Indiana
ELIZABETH K. JOHNSON
Affiliation:
Max Planck Institute for Psycholinguistics, Nijmegen, the Netherlands
*
Address for correspondence: Amanda Seidl, Department of Speech, Language and Hearing Sciences, 500 Oval Drive, Purdue University, West Lafayette, IN 47906, USA. Email: [email protected]

Abstract

Past research has indicated that English-learning infants begin segmenting words from speech by 7·5 months of age (Jusczyk & Aslin, 1995). More recent work has demonstrated, however, that 7·5-month-olds' segmentation abilities are severely limited. For example, the ability to segment vowel-initial words from speech reportedly does not appear until 13·5 to 16 months of age (Mattys & Jusczyk, 2001; Nazzi, Dilley, Jusczyk, Shattuck-Hufnagel & Jusczyk, 2005). In this paper, we report on three experiments using the Headturn Preference procedure that investigate both phonetic and phonological factors influencing 11-month-olds' segmentation of vowel-initial words from speech. We replicate earlier findings suggesting that infants have difficulty segmenting vowel-initial words from speech. In addition we extend these findings by demonstrating that under certain conditions, infants are capable of segmenting vowel-initial words from speech at a much younger age than earlier studies have reported. Our findings suggest that infants' ability to segment vowel-initial words from speech is tightly constrained by acoustic-phonetic factors such as pitch movement at the onset of vowel-initial words and segmental strengthening. These experiments underscore the complexity of early word segmentation, and highlight the importance of including contextual factors in developmental models of word segmentation.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2008

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