Journal article
Stability, reliability, and sensitivity of acoustic measures of vowel space: A comparison of vowel space area, formant centralization ratio, and vowel articulation index
MWJ Caverlé, AP Vogel
Journal of the Acoustical Society of America | ACOUSTICAL SOC AMER AMER INST PHYSICS | Published : 2020
DOI: 10.1121/10.0001931
Abstract
Vowel space (VS) measurements can provide objective information on formant distribution and act as a proxy for vowel production. There are a number of proposed ways to quantify vowel production clinically, including vowel space area, formant centralization ratio, and vowel articulation index (VAI). The stability, reliability, and sensitivity of three VS measurements were investigated in two experiments. Stability was explored across three inter-recording intervals and challenged in two sensitivity conditions. Data suggest that VAI is the most stable measure across 30 s, 2 h, and 4 h inter-recording intervals. VAI appears the most sensitive metric of the three measures in conditions of fatigu..
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Awarded by National Health and Medical Research Council
Funding Acknowledgements
We wish to thank Professor Paul Maruff and Professor Janet Fletcher, who provided support for earlier studies associated with this work, and Dr. Jacewicz for her extensive help during the editorial process. M.W.J.C. performed extraction, analysis, and interpretation of data, drafting the manuscript. A.P.V. provided the study concept and design, and performed data collection, interpretation of data, revision of manuscript, study supervision. A.P.V. is funded by the National Health and Medical Research Council, the Australia Fellowship (#1135683), and is Chief Science Officer of Redenlab a speech biomarker company. M.W.J.C. declares no competing financial interest.