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The field of study on the acquisition of phonological productive abilities by first-language learners in the Romance languages has been largely focused on three main languages: French, Portuguese, and Spanish, including various dialects of these languages spoken in Europe as well as in the Americas. In this article, we provide a comparative survey of this literature, with an emphasis on representational phonology. We also include in our discussion observations from the development of Catalan and Italian, and mention areas where these languages, as well as Romanian, another major Romance language, would provide welcome additions to our cross-linguistic comparisons. Together, the various studies we summarize reveal intricate patterns of development, in particular concerning the acquisition of consonants across different positions within the syllable, the word, and in relation to stress, documented from both monolingual and bilingual first-language learners can be found. The patterns observed across the different languages and dialects can generally be traced to formal properties of phone distributions, as entailed by mainstream theories of phonological representation, with variations also predicted by more functional aspects of speech, including phonetic factors and usage frequency. These results call for further empirical studies of phonological development, in particular concerning Romanian, in addition to Catalan and Italian, whose phonological and phonetic properties offer compelling grounds for the formulation and testing of models of phonology and phonological development.

One of the most fundamental problems in research on spoken language is to understand how the categorical, systemic knowledge that speakers have in the form of a phonological grammar maps onto the continuous, high-dimensional physical speech act that transmits the linguistic message. The invariant units of phonological analysis have no invariant analogue in the signal—any given phoneme can manifest itself in many possible variants, depending on context, speech rate, utterance position and the like, and the acoustic cues for a given phoneme are spread out over time across multiple linguistic units. Speakers and listeners are highly knowledgeable about the lawfully structured variation in the signal and they skillfully exploit articulatory and acoustic trading relations when speaking and perceiving. For the scientific description of spoken language understanding this association between abstract, discrete categories and continuous speech dynamics remains a formidable challenge. Articulatory Phonology and the associated Task Dynamic model present one particular proposal on how to step up to this challenge using the mathematics of dynamical systems with the central insight being that spoken language is fundamentally based on the production and perception of linguistically defined patterns of motion. In Articulatory Phonology, primitive units of phonological representation are called gestures. Gestures are defined based on linear second order differential equations, giving them inherent spatial and temporal specifications. Gestures control the vocal tract at a macroscopic level, harnessing the many degrees of freedom in the vocal tract into low-dimensional control units. Phonology, in this model, thus directly governs the spatial and temporal orchestration of vocal tract actions.