Traditional articulatory descriptions of front rounded and unrounded vowel pairs have assumed that tongue height is the same for the members of the pairs /i-y/, /e-ø/, and /ε-œ/. The electromyographic, articulatory synthetic, and acoustic investigations carried out in this study indicate that, in Dutch, the rounded member of the pairs /i-y/ and /e-ø/ was centralized. In the /ε-œ/ pair, however, the rounded vowel bears a different relationship to its unrounded counterpart.
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Raphael et al. (1979) studied this question.
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