The effect of emphatic stress on consonant vowel coarticulation

This study assessed the acoustic coarticulatory effects of phrasal accent on [V1.CV2] sequences, when separately applied to V1 or V2, surrounding the voiced stops [b], [d], and [g]. Three adult speakers each produced 360 tokens (six V1 contexts x ten V2 contexts x three stops x two emphasis conditio...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America Vol. 121; no. 6; p. 3802
Main Authors: Lindblom, Björn, Agwuele, Augustine, Sussman, Harvey M, Cortes, Elisabet Eir
Format: Journal Article
Language:English
Published: United States 01.06.2007
Subjects:
Adult
Humans
Language
Linguistics
Male
Phonation - physiology
Phonetics
Speech - physiology
Speech Articulation Tests
Voice - physiology
ISSN:1520-8524, 1520-8524
Online Access:Get more information
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Summary:This study assessed the acoustic coarticulatory effects of phrasal accent on [V1.CV2] sequences, when separately applied to V1 or V2, surrounding the voiced stops [b], [d], and [g]. Three adult speakers each produced 360 tokens (six V1 contexts x ten V2 contexts x three stops x two emphasis conditions). Realizing that anticipatory coarticulation of V2 onto the intervocalic C can be influenced by prosodic effects, as well as by vowel context effects, a modified locus equation regression metric was used to isolate the effect of phrasal accent on consonantal F2 onsets, independently of prosodically induced vowel expansion effects. The analyses revealed two main emphasis-dependent effects: systematic differences in F2 onset values and the expected expansion of vowel space. By accounting for the confounding variable of stress-induced vowel space expansion, a small but consistent coarticulatory effect of emphatic stress on the consonant was uncovered in lingually produced stops, but absent in labial stops. Formant calculations based on tube models indicated similarly increased F2 onsets when stressed /d/ and /g/ were simulated with deeper occlusions resulting from more forceful closure movements during phrasal accented speech.
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ISSN:1520-8524
1520-8524
DOI:10.1121/1.2730622