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☛ Prepare to say the words hey! and ho! in sequence but produce only the /h/ portion of each. While observing your face in a mirror or with your phone camera, notice how you configure your lips differently for the two /h/s because you anticipate the vowel that follows. The two /h/s should sound noticeably different. It would therefore make perfect sense to describe /h/ as a “whispered vowel,” though we don't conventionally do that.

This interaction between two sounds in which one affects the production of the other is called COARTICULATION. You can see another coarticulatory effect in Figure 4.1. The speaker is about to produce two words that begin with /t/. But not all /t/ productions are created equal! In the case of tea, the lips are relatively spread in anticipation of the vowel /i/, which also uses spread lips. But, for two, the lips are rounded to match the vowel /u/.