|
In linguistics, assimilation is a common phonological process by which one sound becomes more like a nearby sound. This can occur either within a word or between words. In rapid speech, for example, "handbag" is often pronounced (). As in this example, sound segments typically assimilate to a following sound (this is called regressive or anticipatory assimilation), but they may also assimilate to a preceding one (progressive assimilation). While assimilation most commonly occurs between immediately adjacent sounds, it may occur between sounds separated by others ("assimilation at a distance"). Assimilation can be synchronic—that is, an active process in a language at a given point in time—or diachronic—that is, a historical sound change. A related process is coarticulation, where one segment influences another to produce an allophonic variation, such as vowels acquiring the feature nasal before nasal consonants when the velum opens prematurely or becoming labialised as in "boot". This article describes both processes under the term ''assimilation''. ==Concept== The physiological or psychological mechanisms of coarticulation are unknown; coarticulation is often loosely referred to as a segment being "triggered" by an assimilatory change in another segment. In assimilation, the phonological patterning of the language, discourse styles and accent are some of the factors contributing to changes observed. There are four configurations found in assimilations: *Between adjacent segments. *Between segments separated by one or more intervening segments. *Changes made in reference to a preceding segment *Changes made in reference to a following segment Although all four occur, changes in regard to a following adjacent segment account for virtually all assimilatory changes (and most of the regular ones). Assimilations to an adjacent segment are vastly more frequent than assimilations to a non-adjacent one. These radical asymmetries might contain hints about the mechanisms involved, but they are unobvious. If a sound changes with reference to a following segment, it is traditionally called "regressive assimilation"; changes with reference to a preceding segment are traditionally called "progressive". Many〔For examples, see: Slis, Iman Hans. 1985. ''The voiced-voiceless distinction and assimilation of voice in Dutch''. Helmond: Wibro. 2-3.〕 find these terms confusing, as they seem to mean the opposite of the intended meaning. Accordingly, a variety of alternative terms have arisen—not all of which avoid the problem of the traditional terms. Regressive assimilation is also known as right-to-left, leading, or anticipatory assimilation. Progressive assimilation is also known as left-to-right, perseveratory, preservative, lagging or lag assimilation. The terms anticipatory and lag are used here. Occasionally, two sounds (invariably adjacent) may influence one another in reciprocal assimilation. When such a change results in a single segment with some of the features of both components, it is known as coalescence or fusion. Assimilation occurs in two different types: complete assimilation, in which the sound affected by assimilation becomes exactly the same as the sound causing assimilation, and partial assimilation, in which the sound becomes the same in one or more features, but remains different in other features. Tonal languages may exhibit tone assimilation (tonal umlaut, in effect), while sign languages also exhibit assimilation when the characteristics of neighbouring cheremes may be mixed. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Assimilation (linguistics)」の詳細全文を読む スポンサード リンク
|