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Foreign Accent and Forensic Speaker Identification in Voice Lineups: The Influence of Acoustic Features Based on Prosody

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Development differences in vowel duration in open and closed syllables

¹Department of Communication Disorders, Central Michigan University, Mt. Pleasant 48859.

Perceptual and Motor Skills

|October 1, 1993

Summary

Children

Area of Science:

Linguistics
Developmental Psychology
Acoustic Phonetics

Background:

Vowel duration is a key phonetic feature influenced by syllable structure and age.
Understanding developmental changes in vowel duration provides insights into speech acquisition.
Previous research indicates variability in how children acquire phonetic contrasts.

Purpose of the Study:

To investigate developmental changes in vowel duration in open and closed syllables.
To examine the acoustic properties of vowel duration across different age groups (5, 8, 10-year-olds, and adults).
To determine the influence of phonemic and phonetic factors on vowel duration development.

Main Methods:

Acoustic analysis of vowel duration in three syllables: 'bee', 'bead', and 'beet'.

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Participants included 10 children at each age group (5, 8, 10 years) and adults.

Comparison of mean vowel durations and variability across age groups and syllable types.

Main Results:

Vowel durations for 'bee' and 'bead' were significantly different from 'beet' but not from each other across all ages.
Significant developmental effects observed in both the mean and variability of vowel duration.
Adult-like vowel duration patterns emerged earlier for the 'beet' syllable compared to 'bee' and 'bead'.

Conclusions:

Both phonemic and phonetic factors play crucial roles in the developmental trajectory of vowel duration.
The findings highlight age-related maturation in the production and perception of vowel length.
Syllable context influences the rate of development for specific phonetic features.