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It is interesting to ask whether the high vowels in words like kuten "period" and kitoo "prayer" are voiceless, or are simply non-existent and should be transcribed as [kten] and [ktoË]. There are several reasons to argue that the high vowels are present but voiceless, rather than deleted and absent. First, when we focus on the length of the contrasting words, kuten vs. kuden in figure 2.7, for example, there is no difference between the two words. If the high vowel [u] in kuten were absent and did not have any physical realization, kuten would be expected to be shorter than kuden. Second, when a native speaker pronounces kuten and kitoo, the tongue body is raised for the first part of these words, ku and ki, in a way that is parallel to the tongue position involved in the pronunciation of the first part of the voiced counterparts, kuden and kidoo "starting". Additionally, the lip rounding gesture that accompanies [ɯ] in kuten, although it is not as distinct as its counterpart in English, suggests that the vowel is present without voicing. For example, in a new pair of words, kuten and kiten "starting point", each of the high vowels is between two voiceless consonants, so they are expected to be voiceless. If [ɯ] and [i] were not part of the words at all, the lips should look exactly the same in pronouncing the two words. However, when a native speaker pronounces kuten and kiten, the lips are slightly rounded in kuten but that gesture is not observed with kiten. That is, the articulatory cues, i.e. the tongue position and the lip gesture, remain the same regardless of whether the high vowels are voiced or voiceless. Finally, native speakers perceive voiceless vowels on a par with their voiced counterparts. So, even though all the acoustic cues may not be available to a native listener upon hearing kuten and kiten (e.g. listening to a radio), the distinction between the two high vowels is clearly made and the two words are identified as separate (i.e. [kɯ̥ten] and [kiÌ¥ten]). If the voiceless vowels were simply deleted, however, the listener would hear two identical words (i.e. [kten] and [kten]), contrary to fact. (pp. 26-27)
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