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This paper provides two arguments that error-driven constraint-based grammars should not be learned by directly mirroring the frequency of constraint violation and satisfaction in the target words of a language. The first argument comes from a class of stages attested in phonological development, called Intermediate Faith (IF) stages, in which children produce marked structures only in privileged positions. Two such stages are presented and analyzed, from the literature on English and French L1 acquisition, and their learning consequences are examined. The second argument concerns the degree of restrictiveness that a learner's end-state grammar encodes, using two hypothetical interactions between learner's assumptions about hidden structure and developing constraint rankings that can trick a learner into adopting a superset grammar. These two arguments are used to support an approach called Error-Selective Learning (ESL), in which errors are learned and stored gradually, in a way that relies on violation frequency, but rankings themselves are learned in a non-gradual way (relying on the algorithms of ). It is also shown that violation frequencies can still cause problems regardless of a learner's method of grammatical evaluation—either ranked constraints as in Optimality Theory, or weighted constraints as in Harmonic Grammar. [Copyright &y& Elsevier]

This paper examines morphophonological alternations involving apicoalveolar tap-consonant clusters in Urban East Norwegian from the framework of gestural Optimality Theory. Articulatory Phonology provides an insightful explanation of patterns of vowel intrusion, coalescence, and rhotic deletion in terms of the temporal coordination of consonantal gestures, which interacts with both prosodic and morphological structure. An alignment-based account of derived-environment effects is proposed in which complete overlap in rhotic-consonant clusters is blocked within morphemes but not across morpheme or word boundaries. Alignment constraints on gestural coordination also play a role in phonologically conditioned allomorphy. The gestural analysis is contrasted with alternative Optimality-theoretic accounts. Furthermore, it is argued that models of the phonetics–phonology interface which view timing as a low-level detail of phonetic implementation incorrectly predict that input morphological structure should have no effect on gestural coordination. The patterning of rhotic-consonant clusters in Norwegian is consistent with a model that includes gestural representations and constraints directly in the phonological grammar, where underlying morphological structure is still visible. On the assumption that Universal Grammar lacks faithfulness constraints on input timing, the phonology is free to include non-contrastive phonetic detail such as intersegmental gestural coordination without the danger of overgenerating impossible contrasts. [Copyright &y& Elsevier]