The transition between head and chest registers in operatic singing has been linked to adjustments in the larynx [Henrich, 2006, LPV 31], vocal tract length [Tokuda et al., 2010, JASA 127], and resonance frequencies [Echternach et al., 2011, JASA 129]. Research on supralaryngeal articulator differences, specifically midsagittal tongue shape differences, during this transition is limited. Our previous case study showed a higher tongue dorsum in head voice for low and mid vowels compared to chest voice [Bengtson et al., 2023, CAA 51]. The current study with ten participants (8 female, 1 non-binary, 1 male, aged 19–23) further explores this and the effect of the years of vocal training. Participants were recorded performing a chromatic scale through their register transition, followed by a whole-tone scale in each register, with both tasks repeated twice on each of seven vowels (/a, e, o, ɚ, i, u, y/). The hypothesis is that vowel-dependent tongue adjustments would be observed, with more experienced singers displaying smaller differences between registers. Tongue shapes were traced using DeepEdge, and target frames were extracted [Chen et al., 2020, ISSP 2020]. Preliminary analysis indicates that the tongue dorsum is lower for chest voice and for participants with more years of voice training.
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