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1. Comparing Single-Word Insertions and Multi-Word Alternations in Bilingual Speech: Insights from Pupillometry

   https://doi.org/10.3390/languages7040267  

   Johns, Michael A.; Dussias, Paola E. (December 2022, Languages)

   Prominent sociolinguistic theories of language mixing have posited that single-word insertions of one language into the other are the result of a distinct process than multi-word alternations between two languages given that the former overwhelmingly surface morphosyntactically integrated into the surrounding language. To date, this distinction has not been tested in comprehension. The present study makes use of pupillometry to examine the online processing of single-word insertions and multi-word alternations by highly proficient Spanish-English bilinguals in Puerto Rico. Participants heard sentences containing target noun/adjective pairs (1) in unilingual Spanish, (2) where the Spanish noun was replaced with its English translation equivalent, followed by a Spanish post-nominal adjective, and (3) where both the noun and adjective appeared in English with the adjective occurring in the English pre-nominal position. Both types of language mixing elicit larger pupillary responses when compared to unilingual Spanish speech, though the magnitude of this difference depends on the grammatical gender of the target noun. Importantly, single-word insertions and multi-word alternations did not differ from one another. Taken together, these findings suggest that morphosyntactic integration is not the defining feature of single-word insertions, at least in comprehension, and that the comprehension system is tuned to the distributional properties of bilingual speech. 

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2. Heritage speakers reveal the dynamics of bilingual language regulation

   https://doi.org/10.1017/S1366728925000203  

   Hernandez_Santacruz, Jasmin; Torres, Julio; Kroll, Judith F (March 2025, Bilingualism: Language and Cognition)

   Abstract Bilingual speakers are prompted to remain in a single language, switch between languages, or codeswitch by regulating the concurrent activation of their language systems and adapting to the demands of the communicative context. Unlike studies that compare language switching in bilinguals in distinct interactional and geographical contexts, this study investigates heritage bilinguals who may be required to manage their home and societal languages differently within the course of a day. We examined how this variation affects linguistic and cognitive factors in spoken production. Critically, picture naming in Spanish and English appeared to rely on different mechanisms of cognitive control: greater reliance on proactive control led to decreased performance in Spanish picture naming but increased performance in English. Although convergent with findings that L2-immersed bilinguals prefer proactive control strategies, the findings with heritage bilinguals suggest that recruitment of cognitive control during speech planning is more dynamic than has been previously reported. 

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3. Spanish input accelerates bilingual infants’ segmentation of English words

   https://doi.org/10.1016/j.cognition.2021.104936  

   Mateu, Victoria E.; Sundara, M. (January 2022, Cognition)

   We asked whether increased exposure to iambs, two-syllable words with stress on the second syllable (e.g., guitar), by way of another language – Spanish – facilitates English learning infants' segmentation of iambs. Spanish has twice as many iambic words (40%) compared to English (20%). Using the Headturn Preference Procedure we tested bilingual Spanish and English learning 8-month-olds' ability to segment English iambs. Monolingual English learning infants succeed at this task only by 11 months. We showed that at 8 months, bilingual Spanish and English learning infants successfully segmented English iambs, and not simply the stressed syllable, unlike their monolingual English learning peers. At the same age, bilingual infants failed to segment Spanish iambs, just like their monolingual Spanish peers. These results cannot be explained by bilingual infants' reliance on transitional probability cues to segment words in both their native languages because statistical cues were comparable in the two languages. Instead, based on their accelerated development, we argue for autonomous but interdependent development of the two languages of bilingual infants. 

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4. Language of instruction affects language interference in the third language

   https://doi.org/10.1017/S1366728921000043  

   Tomoschuk, Brendan; Duyck, Wouter; Hartsuiker, Robert J.; Ferreira, Victor S.; Gollan, Tamar H. (August 2021, Bilingualism: Language and Cognition)

   null (Ed.)

   Abstract Applied linguistic work claims that multilinguals’ non-native languages interfere with one another based on similarities in cognitive factors like proficiency or age of acquisition. Two experiments explored how trilinguals regulate control of native- and non-native-language words. Experiment 1 tested 46 Dutch–English–French trilinguals in a monitoring task. Participants decided if phonemes were present in the target language name of a picture, phonemes of non-target language translations resulted in longer response times and more false alarms compared to phonemes not present in any translation (Colomé, 2001). The second language (English) interfered more than the first (Dutch) when trilinguals monitored in their third language (French). In Experiment 2, 95 bilinguals learned an artificial language to explore the possibility that the language from which a bilingual learns a third language provides practice managing known-language interference. Language of instruction modulated results, suggesting that learning conditions may reduce interference effects previously attributed to cognitive factors. 

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5. Cross-linguistic transfer in bilingual children's phonological and morphological awareness skills: a longitudinal perspective

   https://doi.org/10.1017/S1366728924000439  

   Zhang, Kehui; Sun, Xin; Flores-Gaona, Zahira; Yu, Chi-Lin; Eggleston, Rachel L; Nickerson, Nia; Caruso, Valeria C; Tardif, Twila; Kovelman, Ioulia (March 2025, Bilingualism: Language and Cognition)

   Abstract Cross-linguistic interactions are the hallmark of bilingual development. Theoretical perspectives highlight the key role ofcross-linguistic distancesandlanguage structurein literacy development. Despite the strong theoretical assumptions, the impact of such bilingualism factors in heritage-language speakers remains elusive given high variability in children's heritage-language experiences. A longitudinal inquiry of heritage-language learners of structurally distinct languages – Spanish–English and Chinese–English bilinguals (N= 181,M_age= 7.57, measured 1.5 years apart) aimed to fill this gap. Spanish–English bilinguals showed stronger associations between morphological awareness skills across their two languages, across time, likely reflecting cross-linguistic similarities in vocabulary and lexical morphology between Spanish and English. Chinese–English bilinguals, however, showed stronger associations between morphological and word reading skills in English, likely reflecting the critical role of morphology in spoken and written Chinese word structure. The findings inform theories of literacy by uncovering the mechanisms by which bilingualism factors influence child literacy development. 

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