This study investigates how Mexican Spanish/U.S. English heritage bilinguals process scope ambiguities in sentences containing the existential quantifiers a/una and the universal quantifiers every/cada in English and Spanish. Sentences like "A person bought every book" are syntactically ambiguous in both languages, allowing for multiple possible interpretations. Research suggests that one interpretation is often preferred due to lower cognitive demand, though degree of preference varies across languages. Notably, heritage bilinguals may have distinct interpretation preferences in each language, highlighting the complexity of bilingual processing. Sixty Spanish/English heritage bilinguals (Age M = 25.48, SD = 2.65) completed a timed and graded truth-value judgment task in both languages, along with language proficiency tests. We analyzed interpretation ratings, response times, and potential effects of proficiency. Results reveal nearly identical preferred interpretation ratings (Spanish: M = 4.19, SD = 0.56; English: M = 4.14, SD = 0.66) and response times (Spanish: M = 6.97 s, SD = 2.70; English: M = 6.67 s, SD = 1.80) across languages, with one interpretation consistently favored and associated with faster response times. Language proficiency had no significant impact. Our experimental findings offer new insights into heritage bilinguals' processing of competing linguistic structures and inform models of bilingual syntax and cognitive flexibility.
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