{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T05:16:35Z","timestamp":1788412595300,"version":"build-2803163510"},"reference-count":59,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T00:00:00Z","timestamp":1788220800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100002460","name":"Chung-Ang University","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100002460","id-type":"DOI","asserted-by":"crossref"}]},{"id":[{"id":"https:\/\/ror.org\/01r024a98","id-type":"ROR","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003725","name":"National Research Foundation of Korea","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100003725","id-type":"DOI","asserted-by":"crossref"}]},{"id":[{"id":"https:\/\/ror.org\/013aysd81","id-type":"ROR","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003725","name":"Korean government","doi-asserted-by":"publisher","award":["RS-2025-00513582"],"award-info":[{"award-number":["RS-2025-00513582"]}],"id":[{"id":"10.13039\/501100003725","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Behav. Sci.","Behavioral Sciences"],"abstract":"<jats:p>Language mixing is a common feature of bilingual environments, yet its effects on bilingual children\u2019s word learning remain inconsistent across studies. The present study examined how language mixing affects novel word learning in 3- to 4-year-old Korean\u2013English bilinguals, extending previous work to an understudied language pair with a greater language distance than those studied previously. Following an established experimental paradigm, children were taught novel words embedded in either single-language or mixed-language sentences during a looking-while-listening task. For half the children, carrier sentences introduced the novel words in their dominant language; for the other half, they were introduced in their non-dominant language. Overall, children successfully mapped the novel word to referents in the single-language context but showed difficulty doing so in the intra-sentence code-switched language context. However, learning patterns diverged by the dominance of the carrier language; when carrier phrases were presented in a non-dominant language, language mixing significantly affected children\u2019s novel word learning, supporting learning only in a single-language context. No difference in language mixing was observed when the carrier language was dominant. These findings partially replicate and extend prior work on the effects of language mixing on young bilingual learners\u2019 word learning, suggesting that the costs of language mixing vary across learning contexts, depending on the specific switching directionality between two distant languages.<\/jats:p>","DOI":"10.3390\/bs16091547","type":"journal-article","created":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T11:33:32Z","timestamp":1788262412000},"page":"1547","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Asymmetrical Effects of Language Mixing in Bilingual Children\u2019s Word Learning"],"prefix":"10.3390","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-5121-9705","authenticated-orcid":false,"given":"Minjeong","family":"Kang","sequence":"first","affiliation":[{"name":"Department of Psychology, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"visualization","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0698-1511","authenticated-orcid":false,"given":"Youngon","family":"Choi","sequence":"additional","affiliation":[{"name":"Department of Psychology, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"},{"role":"funding-acquisition","vocabulary":"credit"},{"role":"supervision","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"project-administration","vocabulary":"credit"}]}],"member":"1968","published-online":{"date-parts":[[2026,9,1]]},"reference":[{"key":"ref_1","unstructured":"Adobe Inc. (2026, March 15). Adobe Premiere Pro (Version 25.6) [Computer software], Available online: https:\/\/www.adobe.com\/products\/premiere.html."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"250","DOI":"10.3758\/s13428-017-0867-9","article-title":"The language and social background questionnaire: Assessing degree of bilingualism in a diverse population","volume":"50","author":"Anderson","year":"2017","journal-title":"Behavior Research Methods"},{"key":"ref_3","unstructured":"Audacity Team (2024, October 03). Audacity (Version 3.6.4) [Computer software], Available online: https:\/\/www.audacityteam.org\/."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"1073","DOI":"10.1017\/S0305000914000695","article-title":"Look at the gato! Code-switching in speech to toddlers","volume":"42","author":"Bail","year":"2015","journal-title":"Journal of Child Language"},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"1","DOI":"10.18637\/jss.v067.i01","article-title":"Fitting linear mixed-effects models using lme4","volume":"67","author":"Bates","year":"2015","journal-title":"Journal of Statistical Software"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"106486","DOI":"10.1016\/j.jecp.2026.106486","article-title":"Beyond single-language constraints: How bilingual children manage both languages in a verbal fluency task","volume":"266","author":"Blom","year":"2026","journal-title":"Journal of Experimental Child Psychology"},{"key":"ref_7","unstructured":"Boersma, P., and Weenink, D. (2024, October 02). Praat: Doing phonetics by computer (Version 6.4.22) [Computer software], Available online: https:\/\/www.praat.org\/."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"453","DOI":"10.1017\/S1366728914000145","article-title":"Language switch costs in sentence comprehension depend on language dominance: Evidence from self-paced reading","volume":"18","author":"Bultena","year":"2015a","journal-title":"Bilingualism: Language and Cognition"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"586","DOI":"10.1080\/23273798.2014.964268","article-title":"Switch cost modulations in bilingual sentence processing: Evidence from shadowing","volume":"30","author":"Bultena","year":"2015b","journal-title":"Language, Cognition and Neuroscience"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"32","DOI":"10.1017\/S1366728912000120","article-title":"Parental language mixing: Its measurement and the relation of mixed input to young bilingual children\u2019s vocabulary size","volume":"16","year":"2013","journal-title":"Bilingualism: Language and Cognition"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"55","DOI":"10.1017\/S1366728921000699","article-title":"Effects of language mixing on bilingual children\u2019s word learning","volume":"25","author":"Jardak","year":"2022","journal-title":"Bilingualism: Language and Cognition"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"219","DOI":"10.1146\/annurev-devpsych-010923-110936","article-title":"A systems framework of bilingual language acquisition: How development, experience, and contexts interact to shape outcomes","volume":"7","author":"Kircher","year":"2025","journal-title":"Annual Review of Developmental Psychology"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"9032","DOI":"10.1073\/pnas.1703220114","article-title":"Bilingual infants control their languages as they listen","volume":"114","year":"2017","journal-title":"Proceedings of the National Academy of Sciences"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"22","DOI":"10.1111\/infa.12315","article-title":"Dual language input and the impact of language separation on early lexical development","volume":"25","author":"Carbajal","year":"2020","journal-title":"Infancy"},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Castellana, M. A., and Benitez, V. L. (2026). Reconstructing multilingual development research: Shifting from a monolingual bias and toward a developmental systems framework. Behavioral Sciences, 16, (3).","DOI":"10.3390\/bs16030473"},{"key":"ref_16","unstructured":"Champely, S. (2026, August 29). pwr: Basic functions for power analysis (Version 1.3-0) [Computer software], Available online: https:\/\/CRAN.R-project.org\/package=pwr."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"104782","DOI":"10.1016\/j.jml.2026.104782","article-title":"Understanding variation through code-switching: The effects of language experience and cultural identity on bilingual switching","volume":"150","author":"Chan","year":"2026","journal-title":"Journal of Memory and Language"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1080\/14790710508668395","article-title":"Linguistic distance: A quantitative measure of the distance between English and other languages","volume":"26","author":"Chiswick","year":"2005","journal-title":"Journal of Multilingual and Multicultural Development"},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Cysouw, M. (2013). Predicting language-learning difficulty. Approaches to measuring linguistic differences, De Gruyter.","DOI":"10.1515\/9783110305258.57"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"953","DOI":"10.1037\/rev0000367","article-title":"The concept of inhibition in bilingual control","volume":"130","author":"Declerck","year":"2023","journal-title":"Psychological Review"},{"key":"ref_21","unstructured":"Grainger, J., and Jacobs, A. (1998). The BIA model and bilingual word recognition. Localist connectionist approaches to human cognition, Lawrence Erlbaum Associates."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"175","DOI":"10.1017\/S1366728902003012","article-title":"The architecture of the bilingual word recognition system: From identification to decision","volume":"5","author":"Dijkstra","year":"2002","journal-title":"Bilingualism: Language and Cognition"},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Dunn, L. M., and Dunn, D. M. (2007). Peabody picture vocabulary test-IV, Person Assessment.","DOI":"10.1037\/t15144-000"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"1149","DOI":"10.3758\/BRM.41.4.1149","article-title":"Statistical power analyses using G* Power 3.1: Tests for correlation and regression analyses","volume":"41","author":"Faul","year":"2009","journal-title":"Behavior Research Methods"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"175","DOI":"10.3758\/BF03193146","article-title":"G* Power 3: A flexible statistical power analysis program for the social, behavioral, and biomedical sciences","volume":"39","author":"Faul","year":"2007","journal-title":"Behavior Research Methods"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"163","DOI":"10.1177\/02676583241232221","article-title":"Activation and local inhibition in the bilingual child\u2019s processing of code-switching","volume":"41","author":"Liceras","year":"2025","journal-title":"Second Language Research"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"769","DOI":"10.1017\/S1366728923000743","article-title":"Linguistic distance dynamically modulates the effects of bilingualism on executive performance in aging","volume":"27","author":"Gallo","year":"2024","journal-title":"Bilingualism: Language and Cognition"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"515","DOI":"10.1017\/S0305000907008641","article-title":"Does frequency count? Parental input and the acquisition of vocabulary","volume":"35","author":"Goodman","year":"2008","journal-title":"Journal of Child Language"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"67","DOI":"10.1017\/S1366728998000133","article-title":"Mental control of the bilingual lexico-semantic system","volume":"1","author":"Green","year":"1998","journal-title":"Bilingualism: Language and Cognition"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"100821","DOI":"10.1016\/j.cogdev.2019.100821","article-title":"Processing of code-switched sentences by bilingual children: Cognitive and linguistic predictors","volume":"52","author":"Gross","year":"2019","journal-title":"Cognitive Development"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"1283","DOI":"10.1044\/2020_JSLHR-20-00388","article-title":"Processing of code-switched sentences in noise by bilingual children","volume":"64","author":"Gross","year":"2021","journal-title":"Journal of Speech, Language, and Hearing Research"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"97","DOI":"10.14384\/kals.2022.29.4.097","article-title":"An analysis on home environment-based English education assisted by parents in Korea","volume":"29","author":"Han","year":"2022","journal-title":"Journal of Language Sciences"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1017\/S0305000910000759","article-title":"Dual language exposure and early bilingual development","volume":"39","author":"Hoff","year":"2012","journal-title":"Journal of Child Language"},{"key":"ref_34","doi-asserted-by":"crossref","unstructured":"Sekerina, I. A., Spradlin, L., and Valian, V. (2019). Predicting executive functions in bilinguals using ecologically valid measures of code-switching behavior. Bilingualism, executive function, and beyond: Questions and insights, John Benjamins Publishing Company.","DOI":"10.1075\/sibil.57.01sek"},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"128","DOI":"10.1080\/15250000701795598","article-title":"Fast mapping but poor retention by 24-month-old infants","volume":"13","author":"Horst","year":"2008","journal-title":"Infancy"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"F31","DOI":"10.1111\/j.1467-7687.2008.00768.x","article-title":"Does input influence uptake? Links between maternal talk, processing speed and vocabulary size in Spanish-learning children","volume":"11","author":"Hurtado","year":"2008","journal-title":"Developmental Science"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"e13292","DOI":"10.1111\/desc.13292","article-title":"Does code-switching influence novel word learning?","volume":"26","author":"Kaushanskaya","year":"2023","journal-title":"Developmental Science"},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"41","DOI":"10.21811\/EH.79.41","article-title":"Asymmetrical equivalence of linguistically coded information: Focused on Spanish article systems and Korean honorific systems","volume":"79","author":"Kim","year":"2016","journal-title":"Estudios Hisp\u00e1nicos"},{"key":"ref_39","first-page":"34","article-title":"Content and reliability analyses of the receptive and expressive vocabulary test (REVT)","volume":"14","author":"Kim","year":"2009","journal-title":"Communication Sciences & Disorders"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"714","DOI":"10.1017\/S0305000921000118","article-title":"Code-switching in parents\u2019 everyday speech to bilingual infants","volume":"49","author":"Kremin","year":"2022","journal-title":"Journal of Child Language"},{"key":"ref_41","first-page":"249","article-title":"Bilingual children\u2019s comprehension of code-switching at an uninformative adjective","volume":"3","author":"Kremin","year":"2023","journal-title":"Language Development Research"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"113","DOI":"10.18627\/jslg.31.1.201505.113","article-title":"Bilingual reality and English literacy education according to the word order in multi-cultural children in Korea","volume":"31","author":"Lee","year":"2015","journal-title":"The Journal of Studies in Language"},{"key":"ref_43","first-page":"225","article-title":"A study on learner language phenomena related to word order: Why is word order in certain languages easy or difficult to acquire?","volume":"56","author":"Lee","year":"2015","journal-title":"Korean Journal of German Studies"},{"key":"ref_44","unstructured":"Lenth, R. V., and Piaskowski, J. (2026). emmeans: Estimated marginal means, aka least-squares means (Version 2.0.3) [Computer software]. CRAN."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"e2568","DOI":"10.1002\/icd.2568","article-title":"Learning in dos idiomas: The impact of code-switching on children\u2019s noun and verb learning","volume":"34","author":"Libersky","year":"2025","journal-title":"Infant and Child Development"},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"195","DOI":"10.1111\/sjop.12609","article-title":"The bilingual effects of linguistic distances on episodic memory and verbal fluency","volume":"61","author":"Ljungberg","year":"2020","journal-title":"Scandinavian Journal of Psychology"},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"1238","DOI":"10.1017\/S0305000919000400","article-title":"D\u00f3nde est\u00e1 la ball? Examining the effect of code switching on bilingual children\u2019s word recognition","volume":"46","author":"Morini","year":"2019","journal-title":"Journal of Child Language"},{"key":"ref_48","doi-asserted-by":"crossref","unstructured":"Myers-Scotton, C. (2017). Code-switching. The handbook of sociolinguistics, Blackwell Publishing Ltd.","DOI":"10.1002\/9781405166256.ch13"},{"key":"ref_49","doi-asserted-by":"crossref","unstructured":"Niu, Z., Li, Z., Ma, Y., Yu, K., and Wang, R. (2024). Language distance moderates the effect of a mixed-language environment on new-word learning for 4-year-old children. Brain Sciences, 14, (5).","DOI":"10.3390\/brainsci14050411"},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"177","DOI":"10.46449\/MJELL.2021.02.26.1.177","article-title":"The grammatical constraint and grammatical encoding of Korean-English code switching","volume":"26","author":"Park","year":"2021","journal-title":"The Mirae Journal of English Language and Literature"},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"e12794","DOI":"10.1111\/desc.12794","article-title":"Bilingual toddlers\u2019 comprehension of mixed sentences is asymmetrical across their two languages","volume":"22","author":"Potter","year":"2019","journal-title":"Developmental Science"},{"key":"ref_52","unstructured":"R Core Team (2025). R: A language and environment for statistical computing, R Foundation for Statistical Computing. Available online: https:\/\/www.R-project.org\/."},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"1051","DOI":"10.1017\/S1366728923000287","article-title":"Mixed-language input and infant volubility: Friend or foe?","volume":"26","author":"Ruan","year":"2023","journal-title":"Bilingualism: Language and Cognition"},{"key":"ref_54","first-page":"e1421","article-title":"What does it take to learn a word?","volume":"8","author":"Samuelson","year":"2017","journal-title":"Wiley Interdisciplinary Reviews: Cognitive Science"},{"key":"ref_55","doi-asserted-by":"crossref","unstructured":"Swingley, D. (2012). The looking-while-listening procedure. Research methods in child language: A practical guide, Blackwell Publishing Ltd.","DOI":"10.1002\/9781444344035.ch3"},{"key":"ref_56","doi-asserted-by":"crossref","unstructured":"Treffers-Daller, J., Ongun, Z., Hofweber, J., and Korenar, M. (2020). Explaining individual differences in executive functions performance in multilinguals: The impact of code-switching and alternating between multicultural identity styles. Frontiers in Psychology, 11.","DOI":"10.3389\/fpsyg.2020.561088"},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"323","DOI":"10.1037\/tps0000353","article-title":"Patterns of language switching and bilingual children\u2019s word learning: An experiment across two communities","volume":"9","author":"Tsui","year":"2023","journal-title":"Translational Issues in Psychological Science"},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"2143","DOI":"10.1177\/0956797613488145","article-title":"Talking to children matters: Early language experience strengthens processing and builds vocabulary","volume":"24","author":"Weisleder","year":"2013","journal-title":"Psychological Science"},{"key":"ref_59","unstructured":"Yeo, E. J., Ryu, H., Lee, J., Kim, S., and Chung, M. (2023). Comparison of L2 Korean pronunciation error patterns from five L1 backgrounds by using automatic phonetic transcription. arXiv."}],"container-title":["Behavioral Sciences"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2076-328X\/16\/9\/1547\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T04:36:01Z","timestamp":1788410161000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2076-328X\/16\/9\/1547"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,9,1]]},"references-count":59,"journal-issue":{"issue":"9","published-online":{"date-parts":[[2026,9]]}},"alternative-id":["bs16091547"],"URL":"https:\/\/doi.org\/10.3390\/bs16091547","relation":{},"ISSN":["2076-328X"],"issn-type":[{"value":"2076-328X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,9,1]]}}}