Spanish-English Cross-Linguistic Influence on Heritage Bilinguals' Production of Uptalk

The present study examines the production of uptalk in Spanish and in English by Spanish heritage speakers in Southern California. Following the L2 Intonation Learning Theory, we propose that cross-linguistic influence in heritage bilinguals' uptalk may occur along multiple dimensions of intonation. In this study, we examined the systemic dimension (i.e., presence of uptalk and presence of uptalk with IP-final deaccenting), the frequency dimension (i.e., frequency of uptalk and frequency of uptalk with IP-final deaccenting), and the realizational dimension (i.e., pitch excursion and rise duration) of heritage bilinguals' uptalk. Our data showed that the three dimensions of intonation demonstrate varying degrees of cross-linguistic influence. The heritage bilinguals produced uptalk with IP-final deaccenting in both languages (i.e., systemic dimension), but produced it more in English than in Spanish (i.e., frequency dimension). That is, IP-final deaccenting emerges in heritage bilinguals' uptalk in Spanish, but heritage bilinguals seem to recognize that this is an English feature that is not allowed in Spanish and try to suppress it as much as possible when producing uptalk in Spanish. However, in the realizational dimension, the heritage bilinguals demonstrated either phonetic assimilation to English (i.e., pitch excursion) or individual variability conditioned by language learning experience (i.e., rise duration). The asymmetry found across the dimensions suggests that, when bilinguals' two languages are in competition for finite online resources, such as in the case of spontaneous speech production, phonological distinctions between L1 and L2 prosodic structures are kept, whereas phonetic differences that do not lead to any change in meaning are more prone to undergo cross-linguistic influence in order to reduce online processing cost. This study attempts to fill a gap in the literature on the cross-linguistic influence of intonation by bringing attention to heritage bilinguals. Heritage bilingualism introduces bilingual contexts that are often left unnoticed in traditional L2 acquisition scenarios (e.g., transfer from L2 to L1 intonation, asymmetry between order of acquisition and language dominance). Given that many aspects of cross-linguistic influence are shared across bilinguals, the investigation of heritage bilinguals' intonation will contribute to building robust models of bilingual intonation.