Phonological Processes and Rules
Phonological processes are the systematic alternations in pronunciation that languages exhibit, traditionally modeled as rules mapping underlying to surface forms.
Definition
The systematic sound alternations of languages and the rule-based or constraint-based mechanisms used to describe how underlying forms are realized.
Scope
This area covers the recurrent sound patterns of languages: assimilation, dissimilation, deletion, insertion, and lenition, and how they are conditioned by phonetic and prosodic context. It treats the generative framework in which an underlying representation is converted to a surface form by ordered rules, the formal notation for such rules, and the interaction of phonology with morphology and syllable structure. It also covers phonotactic constraints on possible sound sequences. The treatment is descriptive and analytic, surveying processes and the formalisms used to model them.
Sub-topics
Core questions
- What kinds of sound alternations recur across languages?
- How are phonological processes formalized as rules?
- How do rules interact and apply in sequence?
- What constraints govern possible sound sequences within and across syllables?
Key theories
- Rule-based generative phonology
- The framework of Chomsky and Halle in which underlying representations are mapped to surface forms by ordered rewrite rules referring to natural classes of segments and to context.
- Lexical phonology
- Kiparsky's model organizing phonological rules into levels interleaved with morphology, distinguishing lexical rules sensitive to word structure from postlexical rules applying across words.
History
Generative phonology, established by Chomsky and Halle's 1968 Sound Pattern of English, modeled sound patterns as ordered rules. Later refinements included lexical phonology, which organized rules by morphological level, before constraint-based approaches such as Optimality Theory reframed many of these phenomena.
Debates
- Rules versus constraints
- A major shift in phonology concerns whether sound patterns are best captured by ordered derivational rules or by ranked output constraints, a debate central to the rise of Optimality Theory.
Key figures
- Noam Chomsky
- Morris Halle
- Paul Kiparsky
- Michael Kenstowicz
Related topics
Seminal works
- chomsky1968
- kenstowicz1994
- kiparsky1982
Frequently asked questions
- What is a phonological rule?
- A phonological rule is a statement that a sound or feature changes in a specified context, mapping an abstract underlying form to its pronounced surface form, such as a rule that devoices obstruents at the end of a word.
- What is the difference between underlying and surface forms?
- An underlying form is the stored, abstract representation of a morpheme, while the surface form is its actual pronunciation after phonological processes apply. The two can differ when rules or constraints alter the sounds.