| Phonemic Differentiation |
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EXAMPLES For example, in many languages, including English , all Front Vowel s are Unrounded , while all but one of the Back Vowel s are rounded. There are no languages in which all front vowels are rounded and all back vowels are unrounded. The most likely explanation for this is that front vowels have a higher second Formant (F2) than back vowels, and unrounded vowels have a higher F2 than rounded vowels. Thus unrounded front vowels and rounded back vowels have maximally different F2s, enhancing their phonemic differentiation. Phonemic differentiation can have an effect on Diachronic Sound Change . In Chain Shift s, phonemic differentiation is maintained, while in Phonemic Mergers it is lost. Phonemic Splits involve the creation of two phonemes out of one, which then tend to diverge because of phonemic differentiation. CHAIN SHIFTS See Also: Chain shift In a has triggered a backing of and , which in turn has triggered a backing of , and so forth. PHONEMIC MERGERS If a phoneme moves in acoustic space, but its neighbors do not move in a chain shift, a phonemic merger may occur. In this case, a single phoneme results where an earlier stage of the language had two phonemes. A well known example of a phonemic merger in American English is the Cot-caught Merger , by which the vowel phonemes and (illustrated by the words ''cot'' and ''caught'' respectively) have merged into a single phoneme in some Accents . PHONEMIC SPLITS In a phonemic split a phoneme at an earlier stage of the language is divided into two phonemes over time. Usually this happens when a phoneme has two Allophone s appearing in different environments, but Sound Change eliminates the distinction between the two environments. For example in Umlaut in the Germanic Languages , the Back Vowel s originally had front rounded allophones before the vowel in a following syllable. When sound change caused the syllables containing to be lost, a phonemic split resulted, making distinct phonemes. It is sometimes difficult to determine whether a split or a merger has happened in cases where one dialect has two phonemes corresponding to a single phoneme in another dialect; Diachronic research is usually required to determine which dialect is the conservative and which is the innovative. It is also important to note that while some splits and mergers are considered to be part of Standard Language s, others are not considered standard and may be stigmatized. In Descriptive Linguistics , however, the question of which splits and mergers are prestigious and which are stigmatized is irrelevant. Occasionally, speakers of one accent may believe the speakers of another accent to have undergone a merger, when in fact there has been a Chain Shift . For example, an American may hear an Irish person use pronunciations like for ''born'', for ''form'', and for ''cord'' and incorrectly conclude that Hiberno-English has undergone the Card-cord Merger . In fact, there is no merger in Hiberno-English: the words ''barn'', ''farm'', and ''card'' are pronounced . When phonemic changes occur differently in the standard language and in dialects, the dialect pronunciation is often stigmatized. This can result in Hypercorrection , when the dialect speakers attempt to imitate the standard language, but overshoot, as with the Foot-strut Split , where failing to make the split is stigmatized in Northern England, and speakers of non-splitting accents often try to introduce it into their speech, sometimes resulting in hypercorrections such as pronouncing ''pudding'' . SEE ALSO
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