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Journal of Speech and Hearing Research Vol.37 1394-1405 December 1994.
© American Speech-Language-Hearing Association
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Duration of Function-Word Vowels in Mothers' Speech to Young Children

Lori A. Swanson 1
Laurence B. Leonard 2
1 Department of Communicative Disorders The University of Alabama, Tuscaloosa
2 Department of Audiology and Speech Sciences Purdue University West Lafayette, IN

The purpose of this investigation was to determine whether function words are lengthened in certain phrase positions in mother-to-child speech. Twenty-two mother-child dyads served as subjects. All children (ages 1:5 to 2:2) had a mean length of utterance between 1.0 and 1.5 morphemes. Each mother was asked to read five experimental stories aloud to her child and to an adult. The durations of seven function-word vowels in these stories were examined. Each word appeared in three phrase positions (phrase-initial, phrase-medial, and two types of phrase-final). Function-word vowels in initial and medial positions did not differ significantly in adult-directed and child-directed speech. In contrast, function-word vowels in final position were significantly longer in mothers' speech to their children.

KEY WORDS: motherese, vowel duration, function words, language development

Submitted on August 17, 1993
Accepted on May 24, 1994


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