Where phonology meets morphology in the context of rapid language change and universal bilingualism: Irish initial mutations in child language

ABSTRACTAs one of the Celtic languages, Irish is among the few languages in the world that employ word initial mutations (IMs) in order to express grammatical functions. IMs express grammatical information by a way of systematic alternation of minimal phonological contrasts, which closely links segmental phonology to grammatical morphology (Irish also employs final consonant palatalization as a grammatical marker, but this will not be the focus of our paper).The overwhelming majority of Irish speakers are bilingual (with English), and virtually all Irish-speaking children grow up with varying degrees of exposure to and use of English in the home. Irish is undergoing rapid language change at present, and the system of IM is affected by this process of shift such that many fluent Irish speakers show inconsistent use of IM in their spoken language.Given inconsistency in the use of a grammatical system in the adult language, the question arises whether it will be possible to identify developmental norms for t...