Although recent research suggests that gains are made in the acquisition of dialectal features during study abroad, the few studies that have been conducted on this topic in Spanish-speaking contexts have focused primarily on features characteristic of Spain. This article examines the L2 acquisition of phonological features characteristic of Buenos Aires Spanish, [ʃ] and [ʒ], known as sheísmo/zheísmo, for example the pronunciation of llave [ʝaβe] “key” as [ʃaβe] or [ʒaβe]. Participants include 23 learners of Spanish studying in Buenos Aires, Argentina. More than 4,800 tokens were gathered before, during, and at the end of the semester using sociolinguistic interviews, a reading passage, and a word list. These data were analyzed for the influence of linguistic and social factors using mixed-effects logistic regression (Rbrul; Johnson, 2009). Results suggest that participants approximate nativelike norms of use of these features and that time in country is a statistically significant predictor of patterns of phonological variation.

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Students have been found to improve their sociolinguistic competence, particularly regarding the acquisition of dialectal features, while studying abroad. Nevertheless, most of the research on learner development of morphosyntactic features in Spanish-speaking immersion contexts has examined that of variants characteristic of Peninsular Spanish in Spain, namely clitics and the informal second-person plural vosotros. Since the informal second-person singular, vos, is more prevalent than its equivalent, tú, in several Latin American countries, learner acquisition of this feature also merits investigation. This article explores second-language learner production of vos among 23 English speakers during a 5-month semester in Buenos Aires, Argentina, a popular study abroad destination. The findings from the multivariate analysis of over 1200 tokens of tú and vos indicate that learners used vos verb forms over 70% of the time by the end of the sojourn. Factors including social networks, proficiency level, mood, and task significantly influenced this use. Most notably, the stronger the learners’ social networks, the more they used vos verb forms and learners with high proficiency levels used these forms more than lower-proficiency learners. This study provides one of the first accounts of the acquisition of a widespread morphosyntactic feature of Latin American Spanish.