ABCs of ABCDThe theory of Agreement By Correspondence has gained prominence as a way to explain harmony patterns, especially long-distance consonant agreement (Rose & Walker 2004, Hansson 2010. Bennett (2015) observes that the theory also generates Dissimilation, even with no further assumptions made (ergo 'ABCD'). This connection between dissimilation and assimilation is an appealing result, as it was in a large body of previous work that draws on the same mechanisms for both kinds of patterns (Mester 1986, Yip 1988.Recent work along ABCD lines has developed a range of varying formalizations. One point of variation is the correspondence relation at the heart of the theory, and the formal properties of it: is all correspondence homogenous? Is the relation transitive? Is it symmetric? Accompanying such questions are differences in the formal character of the constraints that refer to the correspondence relation: are agreement violations calculated over whole forms, or locally, based on pairs of correspondence? These points of difference definitively affect the typologies that result -particularly for situations where correspondence and/or agreement constraints based on multiple different features may conflict. Previous work has demonstrated as much through analyses of specific cases that seem to work far better in one version than others.1 But the analysis of individual case studies is not the most pressing question for the modern theorist: the much more important question is which of these different ABCD formulations makes the right typological predictions. Any answer to that question presupposes that we know what the typological predictions are. This is far from simple: all of the various formulations of ABCD are intended to generalize across different features, resulting in fairly large sets of constraints. Moreover, demonstrating all the effects of such constraints requires consideration of multiple segmental forms, with multiple correspondence structures available for each. The result is that we are comparing systems that are sufficiently large that their predictions cannot be deduced from intuition alone. This paper takes a step towards that goal. Our aim is to understand the interaction of two ABCD subsystems. Breaking the theory down into sub-systems, helpfully, models a key point of interest in comparing competing formulations. Many of the known differences between different ABCD formulations emerge from the interaction of two distinct ABCD effects (='ABCDE's: harmony or dissimilation patterns). So, if we want to understand the full predictions of any ABCD theory, we must know what possibilities it admits for the relationship between two harmony/dissimilation systems based on different features.The rest of the paper is organized in the following way. Section 2 defines the sub-systems analyzed here -the candidates and constraints included in each. These are modeled on a real-world point of departure, in the form of Kinyarwanda -a language with harmony among sibilants, and dissimilation between voiceless o...
We use model theory to rigorously evaluate Q-Theory as proposed in Shih and Inkelas 2019 as an alternative to Autosegmental Phonology. We find that Q-Theory is remarkably similar to Autosegmental Phonology, contra some of Shih and Inkelas's claims. In particular, Q-Theory does not eschew the association relation, in Q-Theory the tone-bearing unit is the vowel, and Q-Theory and Autosegmental Phonology are equivalent in terms of the constraints they can express. However, this formal analysis clarifies the truly novel contribution of Q-Theory, which is the empirical claim that all segments are tripartite.
The goal of the paper is to analyze the relation between the data (the set of all possible input-output mapping generated by an OT system) and the theory (the ranking conditions that generate each grammar) for an OT system
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