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We have argued that the grammatical features spell-out hypothesis (GFSH) (Liceras, Spradlin, Perales, Fernández, & Álvarez, 2003; Spradlin, Liceras & Fernández, 2003a) accounts for the functional-lexical mixing patterns that prevail in the case of Determiner Phrases produced by bilingual (English-Spanish) children. This hypothesis (Liceras, 2002; Spradlin, Liceras & Fernández, 2003b) states that in the process of activating the features of the two grammars, the child, who will rely on the two lexicons, will make codemixing choices which will favor the functional categories containing the largest array of uninterpretable features (Chomsky, 1998, 1999). This implies that in the case of English/ Spanish child acquisition data, mixed utterances such as el book (Spanish Determiner + English Noun) will prevail over mixed utterances such as the libro (English Determiner + Spanish Noun). Thus, in the process of acquisition, children pay special attention to the visible morpho-phonological triggers which lead to the activation of abstract formal features.
