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• W2599368214 abstract "It is well-known that gravity and head position can have a significant influence on vocal tract shape. This posture effect has been observed by contrasting articulatory data obtained from the same speakers in different postures within or across acquisition modalities. Previous studies have compared velum height during English vowels using upright cineradiography and supine MRI (Whalen 1990); vowels and running speech using upright and supine EMA (Tiede et al. 1997); jaw movement during CVC sequences in upright, supine, and prone position using optical point-tracking (Shiller et al. 1999); Japanese vowels, CV sequences, and running speech using upright and supine X-ray microbeam (Tiede et al. 2000); English word sequences using upright and supine ultrasound tongue imaging (Stone et al. 2002, 2007); Japanese vowels using upright and supine MRI in an open scanner (Kitamura et al. 2005); and Swedish vowels and sustained consonants using supine and prone MRI (Engwall 2006). While this prior work indicates that for some speakers, gravity and posture have a pronounced effect on articulation, the exact nature of this effect is not always fully explored. In particular, acoustic feedback, as well as the relevance of individual articulators for a given vocal tract target configuration, may have an impact on how the posture effect manifests. In this study, we systematically explore the posture effect using 3D electromagnetic articulography (EMA) data of sustained and dynamic speech produced in upright and supine position, taking articulatory relevance into account. In fact, one goal is to replicate as closely as possible the MRI acquisition procedure to show the main effects on articulation and acoustics during the production of sustained vowels. In this work, we present the experimental setup to acquire EMA data in both upright and supine position. We focus particularly on the main differences in both positions regarding the place of articulation and the dynamics (the characteristics of the shifting in articulatory trajectories). Since our final goal is to define a mapping function by which data from one posture may be transformed into another, this study provides helpful insight toward this goal. In fact, the posture effect should be accounted for in any speech production research involving the spatial alignment (registration) of data obtained from modalities with different posture (even from the same speaker), and we expect that our results may facilitate such registration procedures." @default.
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• W2599368214 date "2011-06-20" @default.
• W2599368214 modified "2023-09-25" @default.
• W2599368214 title "Investigating articulatory differences between upright and supine posture using 3D EMA" @default.
• W2599368214 hasPublicationYear "2011" @default.
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