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Allophonic rules are responsible for the great variety in phoneme realizations. Infants can not reliably infer abstract word representations without knowledge of their native allophonic grammar. We explore the hypothesis that some properties of infants’ input, referred to as indicators, are correlated with allophony. First, we provide an extensive evaluation of individual indicators that rely on distributional or lexical information. | Combining Indicators of Allophony Luc Boruta Univ. Paris Diderot Sorbonne Paris Cite ALPAGE UMR-I 001INRIA F-75205 Paris France LSCP Departement d Etudes Cognitives 1 .cole Normale Superieure F-75005 Paris France luc.boruta@inria.fr Abstract Allophonic rules are responsible for the great variety in phoneme realizations. Infants can not reliably infer abstract word representations without knowledge of their native allophonic grammar. We explore the hypothesis that some properties of infants input referred to as indicators are correlated with allophony. First we provide an extensive evaluation of individual indicators that rely on distributional or lexical information. Then we present a first evaluation of the combination of indicators of different types considering both logical and numerical combinations schemes. Though distributional and lexical indicators are not redundant straightforward combinations do not outperform individual indicators. 1 Introduction Though the phonemic inventory of a language is typically small phonetic and phonological processes yield manifold variants1 2 for each phoneme. Words too are affected by this variability yielding different realizations for a given underlying form. Allophonic rules relate phonemes to their variants expressing the contexts in which the latter occur. We are interested in describing procedures by which infants learning their native allophonic grammar could reduce the variation and recover words. Combining insights from both computational and behavioral studies we endorse the hypothesis that infants are good distributional learners Maye et al. 2002 Saffran et al. 1996 and that they may bootstrap into language tracking statistical regularities in the signal. 1We use allophony as an umbrella term for the continuum ranging from typical allophones to mere coarticulatory variants. 88 We seek to identify which features of infants input are most reliable for learning allophonic rules. A few indicators based on .
