Chain Shifts and Merger in New Zealand English
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CHAIN SHIFTS AND MERGER IN NEW ZEALAND ENGLISH CHIKAKO SHIBATA The vowels of New Zealand English have been developing for over a century, though the vowel system is phonemically identical to that of RP. While the chain shift of short front vowels and the rotation of closing diphthongs maintain vowel contrasts, the merger of front centering diph- thongs eliminates them and collapses the vowel system. This paper demonstrates that these sound changes are all ascribed to dominance rela- tions between the constraints on contrasts, and that the NZE constraint ranking achieves a vowel system with at most three phonologically sig- nificant degrees of height.* Keywords: constraint, distinctiveness, auditory space, phonological con- trast, vowel system 1. Introduction Some sound changes tend to preserve the auditory distinctiveness of particular phonemic contrasts. Where vowels are rather close to each other in auditory space, vowel shift reduces possible confusion between them. Diphthongization even increases the perceptibility of distinction by reinforcing a difference on the vowel height dimension. These developments sometimes constitute a chain of events in order to main- tain the entire sound system of a language. On the other hand, splits and mergers inevitably involve an alteration in the system of oppositions. While contrasting phonemes are merged into a single phoneme, allophones of a single phoneme achieve indepen- dent status through splitting. Although these sound changes are incom- patible with the system-preserving processes, chain shifts and merger * I am deeply indebted to the anonymous EL reviewers for their invaluable com- ments on the earlier versions of this article. All remaining errors and inadequacies are of course my own. -27- English Linguistics 23: 1 (2006) 27-57 (c) 2006 by the English Linguistic Society of Japan 28 ENGLISH LINGUISTICS, VOL. 23, NO. 1 (2006) occur synchronically in New Zealand English (hereafter NZE). In Section 2, I consider how the NZE vowel system is described by Hawkins (1976), Wells (1982), B auer (1986, 1994), and other research- ers. The NZE vowel system provides evidence for the existence of con- straints on contrasts. Flemming (1995) proposes a theory of phonologi- cal contrast dubbed the "Dispersion Theory," and claims that perceptual markedness is a property of contrasts rather than individual sounds. In Section 3, I examine the constraints on the system of contrasts that are introduced by NiChiosain and Padgett (2001) and Minkova and Stockwell (2003). The goal of this paper is to account for the chain shifts and merger in NZE in terms of dominance relations between the constraints on con- trasts. Analysis of the NZE vowel system reveals dispersion effects whereby contrasting sounds tend to be evenly distributed over as much auditory space as articulatory effort allows. 2. The Vowel System of New Zealand English According to Bauer (1986: 226), the phonemic system of NZE is reminiscent of or even identical with phonemic systems found in the south eastern part of England, which have the same vowel inventory as Received Pronunciation (hereafter RP). Although phonemically identi- cal, RP and NZE differ in the phonetic realization of certain phonemes.1 Wells (1982) shows the RP vowel system and the NZE vowel system as follows: (1) The RP Vowel System (Wells (1982: 119)) 1 Historical records of New Zealand tell us that European settlement began in the 1840s, and that immigrants were largely British for the rest of the nineteenth centu- ry. The proportion of native-born New Zealanders increased to nearly 60% by 1901 (Sinclair (1996)). After that date, therefore, the development of the English lan- guage in New Zealand started to reflect New Zealand rather than British trends. CHAIN SHIFTS AND MERGER IN NEW ZEALAND ENGLISH 29 (2) The NZE Vowel System (Wells (1982: 608)) In this paper an attempt is made to discuss NZE in its own terms, but from time to time it is inevitably compared with RP. 2.1. The Chain Shift of Short Front Vowels The NZE vowel in words of the lexical set KIT is commonly a central vowel, which is symbolized as /e/ in figure (2). The centralized high vowel is a diagnostic feature of NZE, which indicates that the speaker is not an Australian but a New Zealander.2 Phonologically, at least younger New Zealanders seem to have no distinction between /l/ and /e/, and pronounce finish [fene∫], Philip [felep], as compared to Australian English [filep] and RP [filip] (Trudgill and Hannah (2002: 23)). The front vowels are closer in Australian English than in RP, and they are even closer in NZE than in Australian English. In fact, /e/ of DRESScan range as close as [l] in NZE, so ten can readily be heard as RP or General American tin. However, ten can avoid risking confusion with tin in NZE because of the centrality of the vowel in tin.3 These changes bear the classic marks of a chain shift as illustrated below: 2 The vowel system of Australian English set out by Wells (1982: 596) is shown below: According to Wells (1982: 598), the short front vowels tend to be rather closer than the qualities usual in RP or GA. This development is referred to as "pancake vocalism" because of the effect of squashing up the vowels towards the upper part of the vowel area. 3 Wells (1982: 607) notes that the NZE /e/ often has some degree of diphthonging as in bed [bied]. The present author observed ten [tien] in 2001. 30 ENGLISH LINGUISTICS, VOL. 23, NO. 1 (2006) (3) The Chain Shift of NZE Short Front Vowels According to Bauer (1986: 231-232), acoustic analyses have con- firmed this shift, suggesting that auditory analyses have underestimated the closeness of the front vowels. He gives the following figures for Formant 1 and Formant 2 of the NZE short vowels, which can be com- pared with those of RP equivalents cited in Gimson et al. (1994: 96): (4) Formant Frequencies for Short Front Vowels The F1 frequencies indicate that /e/ of DRESSis closer than /l/ of KIT in NZE, and that /ae/ of TRAPin NZE is as close as /e/ in RP. If this is a chain shift, then we are faced with the issue of whether it is a push chain or pull chain, and which vowel started the chain. This issue is debated among linguists in New Zealand, where the mid vowel may be the possible initiator of the change, giving a push-pull chain. Allan and Starks (2000: 76-80) avoid deciding whether there is a link between the changes occurring to any of the front vowels. However, they assume that if the shift was a push chain, then all three vowels would move simultaneously in order to avoid merger and the potential collapse of the vowel system. If it was a pull chain, then we do not necessarily expect a simultaneous shift, because the centralization of /l/ would not result in a merger with any of the other short vowels. On this line of reasoning, if it was a push-pull chain, the high vowel /l/ would move simultaneously with the initiating mid vowel /e/, but /ae/ CHAIN SHIFTS AND MERGER IN NEW ZEALAND ENGLISH 31 could stay as low as it was before. The acoustic evidence given in (4) shows that the three vowels have shifted relatively simultaneously, sug- gesting that it is a push chain initiated by the low vowel /ae/.4 Although Wells (1982) finds it sensible to symbolize the NZE KIT vowel as /e/, Hawkins (1976) proposes to describe the NZE vowel sys- tem without the transcription [e], for this vowel is not distinctive. Given that the KIT vowel is central and the DRESSvowel is the closest short front vowel, the NZE short vowel system is represented "with only two phonologically significant degrees of height." (Wells (1982: 607)) Hawkins (1976: 50) claims that this vowel system constitutes "a more stable vowel pattern," which can be satisfactorily specified in terms of binary features, than the RP system of short vowels. The NZE short vowels are described by Hawkins (1976: 58) as follows: (5) Feature Composition of the NZE Short Vowels e ae l A U D high + - + - + - front + + - - - - round - - + + 2.2. The Diphthong Shift The diphthong shift is identified by Wells (1982) in his description of London English. This shift affects the four closing diphthongs /el/, /al/, /ou/, and /au/, as well as the closest monophthongs /iI/ and /uI/ which are realized as diphthongs in many dialects. Wells (1982: 308) remarks that the shifts in the starting points of these diphthongs are "presumably 4 Based on the data derived from the Origins of New Zealand English Mobile Unit Corpus, Trudgill (2004: 43) claims that the modem NZE close realizations of /e/ and /ae/ were already present in the speech of the first and second generation of New Zealand born English speakers, while the centralization of /l/ is a twentieth century innovation. The ONZE Mobile Corpus consists of recordings made for the National Broadcasting Corporation of New Zealand between 1946 and 1948 by their Mobile Disc Recording Unit, which traveled around small towns in both the North Island and South Island of New Zealand. Trudgill maintains that the Southern Hemisphere English varieties have short front vowels which are close in quality because they inherited these qualities from southeastern English varieties. He argues that "the occurrence of a single innovation-that of lowering in England-is very much more likely to be the correct explanation for this differentiation than the occurrence of four separate but identical innovations that just happened to take place at about the same time in four different and widely separated parts of the world." 32 ENGLISH LINGUISTICS, VOL.