The phenomenon of incomplete neutralisation describes a situation where a putative case of categorical phonological neutralisation is observed to be phonetically non-neutralising. This has been argued to be a problem for phonological theories that employ categorical features. Here, we use two distinct feeding orders of tone sandhi processes from Huai’an Mandarin to show that incomplete phonetic neutralisation is compatible with categorical phonological phenomena. Therefore, incomplete phonetic neutralisation does not automatically inform us of gradient phonological representations. We further show that incomplete phonetic neutralisation can in fact have a large effect size. Such results are not surprising from a classic generative view of phonology where linguistic performance is argued to be a multi-factorial problem, and linguistic knowledge (i.e., competence) is only one of the many factors involved. Furthermore, our results suggest that the observed incompleteness or gradience may have a source outside phonological knowledge.

Southern Pomo (Pomoan, California) displays a process of rhythmic vowel deletion (syncope) reflecting two mutually incompatible metrical structures. This phenomenon, called metrical incoherence, can be derived by an ordered sequence of independent subgrammars, that is, strata. Metrical incoherence is under-attested crosslinguistically, and the stratal models of phonology necessary to generate it have been criticised for predicting counter-typological phenomena. Nevertheless, the Southern Pomo data cannot be generated in more restrictive frameworks. This article argues that overgeneration is a necessary property of the phonological component, and that metrical incoherence is rare because it is difficult to learn. In Southern Pomo, this difficulty appears to have caused grammatical competition and restructuring: a second pattern of syncope, occurring in only a limited context, suggests that learners have reanalysed the grammar as having consistent metrical structure across the derivation. This work thus supports the proposal that diachronic change – and therefore typology – is constrained by extragrammatical factors.

This study examines phonological and phonetic properties of ATR contrasts in the vowel system of Akebu (Kwa). The sum of descriptive evidence, including vowel harmony, vowel distribution in non-harmonising contexts, vowel reduction and typological and etymological considerations, indicates a rare vowel inventory with an ATR contrast in front/back vowels but a height contrast in the three redundantly [−ATR] central vowels /ᵻ, ə, a/. This analysis was checked against four common acoustic metrics of ATR: F1 and F2 frequencies, spectral slope and F1 bandwidth size (B1). As expected, the results for the last three metrics were variable across speakers and vowel types, and are therefore inconclusive. The results for F1 were consistent but do not distinguish between ATR and vowel height. Two results nonetheless suggest the [−ATR] status of central vowels: they occupy the same belt of F1 frequencies and show the same position of observed-over-predicted B1 values as front and back [−ATR] vowels.

Marlo et al. (2015) claim that Kuria verbal tone morphology undermines three well-established principles of locality and modularity: (1) Phonological Locality: the assumption that rules and constraints may only evaluate a small window of phonological objects; (2) Cyclic Locality: the stratal organization of morphophonology into stems, words and phrases; and (3) Indirect Reference: the claim that phonological rules and constraints cannot directly access morphosyntactic information. Sande et al. (2020) turn this claim into an argument for a new model of the morphosyntax–phonology interface, Cophonologies by Phase, which erases the separation between phonology and morphology and abandons standard locality domains in favour of syntactic phases. In this article, I show that the conclusions of both articles are unfounded: the Kuria data follow naturally from an analysis based on autosegmental tone melodies in a version of Stratal Optimality Theory which embraces all three restrictions, Phonological and Cyclic Locality and Indirect Reference, the latter implemented by Coloured Containment Theory. I argue that this approach obviates the technical and conceptual objections raised by Marlo et al. against a tone-melody analysis of Kuria, and makes more restrictive predictions about possible systems of tonal morphophonology compared to construction phonology frameworks.