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KMID : 1036820140190010113
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Communication Sciences & Disorders
2014 Volume.19 No. 1 p.113 ~ p.119
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Acoustic Characteristics of Adults’ Rhotic Monophthongs and Diphthongs
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Chung Hyun-Ju
PollockKaren E.
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Abstract
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.Objectives: Rhotic sounds are known to be among the later developed sounds in young children, especially for those with speech sound disorders. Despite this fact, not many studies have examined the characteristics of rhotic vowels. Adults’ productions of rhotic vowels have not been well investigated in spite of a relatively large literature on rhotic consonants. This study examined the acoustic characteristics of rhotic monophthongs and diphthongs to see if certain phonetic contexts require less demanding articulatory movements or are different in vowel duration from other contexts, and thus work as a facilitating context for the acquisition of rhotic vowels.
Methods: Ten monolingual female adult speakers of Western Canadian English produced 36 target words containing two rhotic monophthongs ([?] and [?]), and four rhotic diphthongs (/???/, /???/, /???/, and /???/) in both open and closed syllables. Acoustic analyses were performed to extract F2 and F3 values across the vowel duration, as well as the duration for each vowel.
Results: Constantly low F3-F2 values were found for rhotic monophthongs and rhotic diphthongs with front pre-rhotic vowels, but steeper downward movement was found for rhotic diphthongs with back pre-rhotic vowels. Stressed and unstressed rhotic monophthongs showed similar acoustic patterns, except for [?] which was slightly longer than [?]. Across four rhotic diphthongs, no clear durational difference was found.
Conclusion: Differences in acoustic patterns by phonetic contexts across six different rhotic vowel types suggest that certain phonetic contexts could provide more salient perceptual cues and thus facilitate relatively easier mastery of sounds over others for young children.
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KEYWORD
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Rhotic vowels, Adults, Acoustics
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