This eye-tracking study examined how heritage speakers of Spanish process gender agreement morphology at a distance, focusing on the activation of the gender feature during sentence processing. Previous work is conceptually replicated and further extended by assessing (1) whether reduced sensitivity to gender agreement mismatches when another word intervenes between the head noun and its modifying adjective stems from weakened gender feature activation, (2) whether a gender-marked determiner enhances this activation, and (3) whether Age of Onset of Bilingualism (AOB) plays a role in this activation. Fifty-three English-dominant heritage speakers of Spanish and a comparison group of 32 Spanish-dominant monolingually raised speakers read sentences with and without gender agreement mismatches while their eye movements were monitored. Sentences contained mismatches in adjectives modified by the intensifier "muy" under two conditions: a No Cue condition (e.g., árboles muy altos/*altas) and a Cue condition with a gender-marked determiner (e.g., unos árboles muy altos/*altas). Statistical modeling of the eye-tracking data suggests similar effects for both groups in the No Cue condition, but AOB and proficiency modulated sensitivity for heritage speakers with a later AOB (4–6). Gender cues on the determiner (Cue condition) impacted the time course of agreement processing for all groups, the total time spent reading mismatches for all heritage speakers as a function of proficiency, and the rereading time for heritage speakers with a later AOB (4–9). We consider the role of Age of Onset of Bilingualism (AOB) and proficiency in morphosyntactic processing, feature retrieval, and cue facilitation in heritage language processing.
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