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Defying gravity: Formant frequencies of English vowels produced in upright and supine body position

This case study investigated the effect of body position on the first three formants (F1, F2, F3) of the British English vowels /iː/, /ɛ/, /æ/, /ɔː/ and /uː/ produced by one male native speaker. While F1 remained unaffected significant changes in F2 and F3 were found for certain vowels when they were produced in a supine rather than in an upright position. F2 was significantly lower for /iː/, /ɛ/ and /æ/ but not for /ɔː/ and /uː/ when the speaker was lying. Lowering of F3 was significant for /iː/, /æ/ and /uː/. These preliminary results obtained from one subject suggest that the posture of the speaker and hence gravity influence vowel articulation and its acoustic outcome. However, not all vowels and all formants are affected the same way.