Labialized Consonants in Iraqw Alain Ghio1 Maarten Mous2 and Didier Demolin3

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Labialized Consonants in Iraqw Alain Ghio1 Maarten Mous2 and Didier Demolin3 Labialized consonants in Iraqw Alain Ghio1 Maarten Mous2 and Didier Demolin3, Aix-Marseille Univ. & CNRS UMR7309 – LPL1, Universiteit Leiden2, Laboratoire de phonétique et phonologie, CNRS-UMR 7018, Sorbonne nouvelle3 Iraqw a Cushitic language spoken in Tanzania has a set of labialized consonants /ŋw, kw, gw, qw ́, xw/ in its phonological inventory (Mous, 1993). This study makes a comparison between labial movements involved in the production of these consonants and compares them with the gestures of the bilabial nasal [m] and the labiovelar approximant [w]. Data were recorded combining acoustic, EGG and video data. The latter were taken by using simultaneous front and profile images, first at normal speed (25 fps) and then at high-speed (300 fps). Data were recorded with 4 women and 5 men. Results show that the labialized consonants [ŋw, kw, gw, qw ́, xw] are produced with a gesture different from the bilabial nasal and the labiovelar approximant that both involve some lip rounding and protrusion. The labialized consonants show a slow vertical opening movement of the lips with a very slight inter-lip rounding. Figure 1 compares lips positions immediately after the release of the different closures for [kw and qw ́] and in the middle of the gesture of [m] and [w]. Figure 1. Lips front and profile positions shortly after the closure release of [kw] and [qw ́] showing a small inter-lip rounding for [qw ́]. [w] and [m] show both lip rounding and protrusion. High-speed video confirms 2 different types of labial gestures. These findings sustain a claim made by Ladefoged & Maddieson (1996) who suggested 2 possible types of labial gestures involved in the production of labial consonants. One is a vertical displacement of both lips and the other implies rounding and protrusion of the lips. The first is implied in the production of the labialized consonants in Iraqw while the second is linked to the production of [m and w]. These observations have some interesting possible relations with diachronic process. While there is no doubt that labialization involves lip rounding and protrusion, labialized consonants could reflect the lenition of old labio-dorsal consonants. This hypothesis should of course be confirmed by substantial diachronic data. Ladefoged, P. & Maddieson, I. (1996). The Sounds of the World’s languages. Oxford, Blackwell. Mous, M. (1993). A Grammar of Iraqw, Kuschitische Sprachstudien 9, Hamburg, Hemut Buske Verlag. .
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