Finding identity in the midst of ambiguity: case and number disambiguation in Basque

ABSTRACT Restrictive contextual information has been found to bias syntactic disambiguation, when only one alternative leads to a meaningful interpretation. The current study tests whether disambiguation can be influenced by nonrestrictive cues – when several alternatives are equally plausible. We first evaluated if modifier number biased the disambiguation of number- and case-ambiguous nouns in Basque. In a noun phrase comprehension paradigm, ambiguous noun number judgments were biased by preceding modifier number. Then, using a preamble completion paradigm, we examined whether headnoun disambiguation and thus sentence completion was also biased by modifier number. Our results suggest that nonrestrictive information (singular and plural number) can affect disambiguation. We also report task differences in the overall interpretation of ambiguous Basque nouns, as well modifier-induced agreement errors. We suggest that the parser uses any available context information when there is ambiguity, including preceding modifier markings.