PBS (Public Broadcasting Service) has an interesting article about the current changes of American English pronunciation. The article discusses several vowel shifts that are occuring:
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The Low-Back Merger
A “merger” describes what happens when a distinction between two (or more) sounds is lost. The sounds essentially merge into a single sound. The Low-Back Merger blends two vowel sounds that are pronounced with the tongue positioned low and back in the mouth. The vowels are the “o” sound of cot (box, lot, job, Don, etc.) and the “au” sound of caught (fought, bought, off, dawn, etc.). Many Americans use the same vowel in all of these words, so for them cot and caught as well as Don and dawn, stock and stalk, and other pairs are homophones. |
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The Northern Cities Shift
When a vowel sound moves into another vowel’s territory, the result may be a merger —as when the sound of caught comes to be pronounced with the tongue in the same region of the mouth as for cot. In a different pattern, the movement of one vowel spurs a reactive movement in a neighboring vowel. As with strangers in an elevator, one vowel shifts to keep its distance when another enters the space.
These coordinated movements are heard in the Northern Cities Shift, which affects six different vowels, those appearing in caught, cot, cat, bit, bet and but. In this change, caught takes on a vowel similar to that originally used for cot. The cot vowel also shifts, becoming more like the vowel of cat. The vowel of cat takes a position closer to that ordinarily heard with bit and sometimes sounds like the “ea” in idea. Words like bit are pronounced with a vowel nearer to bet or even but whereas bet words have a vowel similar to that in cat or but, and the vowel but words comes to sound more like that of caught. When these changes are plotted according to the positioning of the tongue, the connections among them are clear and the shift resembles a clockwise rotation of the vowels in the mouth. |
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The Southern Shift
A very different but equally complicated pattern of vowel changes is found in the South. Dubbed the Southern Shift, these changes affect seven vowels. Probably the best known is the pronunciation of the “long i” sound as “ah,” so that sighed sounds like sod, time like Tom, etc. Another element of the Southern Shift affects the vowel of tame, which comes to sound like that of time, and the apparently related change of the team vowel to resemble that of tame. The vowels of sit and set are also affected, becoming more like see it and say it. The other pieces in the Southern shift change the vowels of boot and boat. These vowels are traditionally pronounced with the tongue placed in the back of the mouth, but here they are made with the tongue more toward the front. |
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The California Shift
California is the home base of another vowel shift that bears some resemblance to both the Southern Shift and the Northern Cities Shift. In California, as in the South, the vowels of boot and boat are shifting forward in their articulation. This trend is extremely widespread in American English and is heard throughout the Midwest and West as well as the South. The California Shift resembles the Northern Cities Shift in the way that the vowel of bit comes to sound like bet while the vowel of bet sounds like bat. Not to be outdone, the vowel of bat takes on a “broad a” quality and sounds like the “a” of father.
These changes appear to be recent innovations in California speech; they came to the attention of researchers in the 1980s and today are heard primarily from younger speakers. It’s hard to know whether they will have staying power, but the linguistic facts suggest that they will spread in and beyond California. The changes affecting bit, bet, and bat appear to be a coordinated shift among vowel neighbors: bat moves out and bet moves into the position vacated by bat which leads bit to move into the position vacated by bet. The initiating step, the moving of bat, is made possible by a change discussed above, the Low-Back Merger. That merger opens some space next door to bat by collapsing the vowels of cot and caught. |
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http://www.pbs.org/speak/ahead/change/changin/
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