Please join us for the next talk in our 2016–2017 colloquium series:
Speaker: Stephanie Shih (University of California Merced)
Date & Time: March 17th at 3:30 pm
Place: Education Bldg. rm. 433
Title: A multilevel approach to lexically-conditioned phonology
Lexical classes often exhibit different phonological behaviours, in alternations or phonotactics. This talk takes up two interrelated issues for lexically-conditioned phonological patterns: (1) how the grammar captures the range of phonological variation that stems from lexical conditioning, and (2) whether the relevant lexical classes needed by the grammar can be learned from surface patterns. Previous approaches to lexically-sensitive phonology have focused largely on constraining it; however, only a limited understanding currently exists of the quantitative space of variation possible (i.e., entropy) within a coherent grammar.
In this talk, I present an approach that models lexically-conditioned phonological patterns as a multilevel grammar: each lexical class is a cophonology subgrammar of indexed constraint weight adjustments (i.e., varying slopes) in a multilevel Maximum Entropy Harmonic Grammar. This approach leverages the structure of multilevel statistical models to quantify the space of lexically-conditioned variation in natural language data. Moreover, the approach allows for the deployment of information-theoretic model comparison to assess competing hypotheses of what the phonologically-relevant lexical classes are. I’ll show that under this approach, the relevant lexical classes need not be a priori assumed but can instead be induced from noisy surface input via feature discovery.
Two case studies are examined: part of speech-conditioned tone patterns in Mende and content versus function word prosodification in English. Both case studies bring to bear new quantitative evidence on classic category-sensitive phenomena. The results illustrate how the multilevel approach proposed here can capture the probabilistic heterogeneity and learnability of lexical conditioning in a phonological system, with potential ramifications for understanding the structure of the developing lexicon in grammar acquisition.