The sonority sequencing principle (SSP)[1][2] or sonority sequencing constraint is a phonotactic principle that aims to outline the structure of a syllable in terms of sonority.
The SSP states that the syllable nucleus (syllable center), often a vowel, constitutes a sonority peak that is preceded and/or followed by a sequence of segments – consonants – with progressively decreasing sonority values (i.e., the sonority has to fall toward both edges of the syllable). The sonority values of segments are determined by a sonority hierarchy, though these differ to some extent from language to language. Typically they are vowel > glide > liquid > nasal > obstruent (or > fricative > plosive > click). That is, the segment order in a syllable tends to be of the pattern Ʞ-P-F-N-L-G-V-G-L-N-F-P. The fricative–plosive and nasal–plosive rankings may be reversed. Wright (2004: 51–52) notes,[3]
In a Sonority Sequencing Constraint that is based on perceptual robustness, a stranded consonant (one without a flanking vowel, liquid, or glide) is dispreferred unless it has sufficiently robust internal cues to survive in the absence of formant transitions. ... Segments that we expect to survive without the benefits of flanking vowels, and thus be found at syllable edges with intervening stops, are the sibilant fricatives, potentially other fricatives ... and nasals.
A good example for the SSP in English is the one-syllable word trust: The first consonant in the syllable onset is t, which is a stop, the lowest on the sonority scale; next is r, a liquid which is more sonorous, then we have the vowel u/ʌ/ – the sonority peak; next, in the syllable coda, is s, a sibilant, and last is another stop, t. The SSP explains why, for example, trend is a valid English word but *rtedn (flipping the order of consonants) is not. Language processing has also been shown experimentally to be sensitive to sonority violations.
Some languages possess syllables that violate the SSP (Russian and dialectal Arabic, for example) while other languages strictly adhere to it, even requiring larger intervals on the sonority scale: In Italian for example, a syllable-initial stop must be followed by either a liquid, a glide or a vowel, but not by a fricative (except: [ps] borrowed words like: pseudonimo, psicologia). Some languages allow a sonority "plateau"; that is, two adjacent tautosyllabic consonants with the same sonority level. Modern Hebrew is an example of such language.
A number of Indo-European languages[4] that typically follow the SSP will violate it with /s/ + stop clusters. For example, in the English word string or Italian spago the more sonorous /s/ comes before a less sonorous sound in the onset. In native English words, no phoneme other than /s/ ever violates the SSP. Latin also was able to violate the principle in this way, however the Vulgar Latin dialects that evolved into the Western Romance languages lost this ability, causing the process of I-prosthesis to occur, whereby an /i/ was inserted at the beginning of such a word, to make the /s/ instead a coda consonant rather than an onset consonant. As a result, Western Romance languages like Spanish and French will have espada and épée (from espee) respectively where a non-Western Romance language like Italian has spada, and even has words such as sdraio 'deck-chair'.
However, all of the sonority violations noted above occur at word edges, not word-internally. Therefore, some recent phonological accounts postulate that the segments outside of the sonority sequencing may be considered "extrasyllabic consonants", consonants occurring outside of any syllable, and licensed in their language by the word they are part of.[5] English string, for example, would then contain a syllable [tring] with a preceding extrasyllabic s.
There are some languages that violate the SSP completely, such as Dorig. Examples in Dorig include rqa[rk͡pʷa] 'woman', m̄sar[ŋ͡mʷsar] 'poor', and wrēt[wrɪt] 'squid'.
Sources
↑ Selkirk, E. (1984). On the major class features and syllable theory. In Aronoff & Oehrle (eds.) Language Sound Structure: Studies in Phonology. Cambridge: MIT Press. 107-136.
↑ Clements, G. N. (1990). The role of the sonority cycle in core syllabification. In J. Kingston and M. E. Beckman (eds.) Papers in Laboratory Phonology I: Between the grammar and the physics of speech. Cambridge: Cambridge University Press. 283-333.
↑ Wright, Richard (2004). A review of perceptual cues and robustness. In Bruce Hayes, Robert Kirchner & Donca Steriade (eds.) Phonetically based phonology. Cambridge University Press, 34–57.
↑ Green, Anthony Dubach (2003). "Extrasyllabic consonants and onset well-formedness". In Féry, Caroline; van de Vijver, Ruben (eds.). The syllable in optimality theory. Cambridge: Cambridge University Press. pp.238–253. doi:10.1017/CBO9780511497926.010. ISBN9780511497926.
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