When gender meets number: facilitative processing of one vs. two features on Spanish definite articles

Research on real-time language comprehension has shown that speakers of various language backgrounds can use a pre-nominal morphosyntactic cue to facilitate the lexical retrieval of an upcoming noun. The present study takes the next step in this domain, investigating facilitative processing when two morphosyntactic cues to the target noun are available: gender and number. We conduct an eye-tracking study using the Visual World Paradigm, and we compare baseline and heritage speakers to determine how language experience modulates the relative weighting of multiple cues. We find evidence of facilitative processing of plural articles for both groups, not only when both features are informative cues to the target, but also when only one of the features is informative. This suggests that listeners access each morphosyntactic feature independently, which is a particularly noteworthy finding for the heritage group, who have been argued not to do so in prior offline studies. However, we find that language experience impacts the relative weighting of the two cues. When gender and number are compatible with different competitors and are thus in direct conflict, baseline speakers shift more to gender competitors, whereas heritage speakers do not. Additionally, when each feature uniquely identifies the target, in some contexts baseline speakers may attend to only the gender feature, whereas heritage speakers may attend to only the number feature. Taken together, these results suggest that baseline speakers may weight abstract grammatical gender more strongly, while heritage speakers may rely more on the semantically salient feature.