April McMahon is Lecturer in Phonology and Historical Linguistics in
the Department of Linguistics at the University of Cambridge.
This book has two main goals: the re-establishment of a rule-based
phonology as a viable alternative to current non-derivational models,
and the rehabilitation of historical evidence as a focus of phonological
theory. Although Lexical Phonology includes several constraints, such
as the Derived Environment Condition and Structure Preservation,
intended to reduce abstractness, previous versions have not typically
exploited these fully. The model of Lexical Phonology presented here
imposes the Derived Environment Condition strictly; introduces a new
constraint on the shape of underlying representations; excludes under-
speci®cation; and suggests an integration of Lexical Phonology with
articulatory phonology. Together, these innovations ensure a substan-
tially more concrete phonology. The constrained model is tested against
a number of well-known processes of English, Scottish and American
accents, including the Vowel Shift Rule, the Scottish Vowel Length
Rule, and [r]-Insertion, and draws interesting distinctions between what
is derivable by rule and what is not. Not only can this Lexical
Phonology model the development of low-level variation to phonolo-
gical rules, and ultimately to dialect differentiation in the underlying
representations; but a knowledge of history also makes apparently
arbitrary synchronic processes quite natural. In short the phonological
past and present explain one another.
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