{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,12]],"date-time":"2026-03-12T01:59:27Z","timestamp":1773280767461,"version":"3.50.1"},"reference-count":42,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2024,9,13]],"date-time":"2024-09-13T00:00:00Z","timestamp":1726185600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Hum. Neurosci."],"abstract":"<jats:p>Clear speech, a speaking style used to mitigate communicative circumstances affecting the transmission or decoding of speech signal, often involves the enhancement of language-specific phonological contrasts, including laryngeal contrasts. This study investigates the role of language dominance in the implementation of language-specific laryngeal contrasts in L2 clear speech. Two groups of Korean-English speakers (L1 Korean) were tested: a relatively less Korean-dominant L2-immersed group of sequential bilinguals (<jats:italic>N<\/jats:italic>\u2009=\u200930) and a strongly Korean-dominant L1-immersed group (<jats:italic>N<\/jats:italic>\u2009=\u200930), with dominance assessed based on the results of the Bilingual Language Profile. Participants read a set of English minimal pairs differing in the voicing of word-initial stops (e.g., <jats:italic>tab<\/jats:italic> vs. <jats:italic>dab<\/jats:italic>), and their acoustic enhancement strategies were compared with those of native English speakers (<jats:italic>N<\/jats:italic>\u2009=\u200920). As correlates of the English laryngeal contrast, voice onset time (VOT) and onset f0 were measured. Results showed that both bilingual groups enhanced English laryngeal contrast in clear speech via voiceless VOT lengthening, similarly to native English speakers, but to a smaller extent than native speakers. Both bilingual groups also implemented a greater degree of onset f0 difference between voiced and voiced English stops than native English speakers did, although no enhancement of this parameter was observed in their clear speech. Surprisingly, no significant differences were found between L2- and L1-immersed speakers, suggesting a lack of language immersion effect on the acoustic enhancement strategies in L2 clear speech. We discuss possible explanations for this finding and propose directions for future research.<\/jats:p>","DOI":"10.3389\/fnhum.2024.1413886","type":"journal-article","created":{"date-parts":[[2024,9,13]],"date-time":"2024-09-13T11:57:25Z","timestamp":1726228645000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":1,"title":["Enhancement of laryngeal contrasts in non-native English clear speech: a comparison between L2-immersed sequential bilinguals and L1-immersed speakers"],"prefix":"10.3389","volume":"18","author":[{"given":"Ye Jee","family":"Jung","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Olga","family":"Dmitrieva","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1965","published-online":{"date-parts":[[2024,9,13]]},"reference":[{"key":"ref1","first-page":"25","volume-title":"Relative power of cues: F0 shift versus voice timing","author":"Abramson","year":"1985"},{"key":"ref2","doi-asserted-by":"publisher","first-page":"277","DOI":"10.1515\/multi-2019-0009","article-title":"Investing in the future: Korean early English education as neoliberal management of youth","volume":"39","author":"Bae","year":"2020","journal-title":"Multilingua"},{"key":"ref3","doi-asserted-by":"publisher","first-page":"1","DOI":"10.18637\/jss.v067.i01","article-title":"Fitting linear mixed-effects model using lme4","volume":"67","author":"Bates","year":"2015","journal-title":"J. Stat. Softw."},{"key":"ref4","volume-title":"Bilingual language profile: An easy-to-use instrument to assess bilingualism","author":"Birdsong","year":"2012"},{"key":"ref5","author":"Boersma","year":"2005"},{"key":"ref7","doi-asserted-by":"publisher","first-page":"251524592096035","DOI":"10.1177\/2515245920960351","article-title":"An introduction to linear mixed-effects modeling in R","volume":"4","author":"Brown","year":"2021","journal-title":"Adv. Methods Pract. Psychol. Sci."},{"key":"ref9","doi-asserted-by":"publisher","first-page":"77","DOI":"10.1016\/j.wocn.2014.12.005","article-title":"Phonological status, not voice onset time, determines the acoustic realization of onset F0 as a secondary voicing cue in Spanish and English","volume":"49","author":"Dmitrieva","year":"2015","journal-title":"J. Phon."},{"key":"ref10","doi-asserted-by":"publisher","first-page":"259","DOI":"10.1121\/1.1482078","article-title":"Vowel intelligibility in clear and conversational speech for normal-hearing and hearing-impaired listeners","volume":"112","author":"Ferguson","year":"2002","journal-title":"J. Acoust. Soc. Am."},{"key":"ref11","doi-asserted-by":"publisher","first-page":"1241","DOI":"10.1044\/1092-4388(2007\/087)","article-title":"Talker differences in clear and conversational speech: acoustic characteristics of vowels","volume":"50","author":"Ferguson","year":"2007","journal-title":"J. Speech Lang. Hear. Res."},{"key":"ref9001","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1017\/9781108886901.002","article-title":"The revised Speech Learning Model (SLM-r)","volume-title":"Second language speech learning: Theoretical and empirical progress","author":"Flege","year":"2021"},{"key":"ref13","volume-title":"An R companion to applied regression","author":"Fox","year":"2019"},{"key":"ref14","doi-asserted-by":"publisher","first-page":"509","DOI":"10.1016\/j.wocn.2012.02.006","article-title":"An acoustic\u2013phonetic comparison of the clear speaking styles of Finnish\u2013English late bilinguals","volume":"40","author":"Granlund","year":"2012","journal-title":"J. Phon."},{"key":"ref15","doi-asserted-by":"publisher","first-page":"102982","DOI":"10.1016\/j.specom.2023.102982","article-title":"Acoustic properties of non-native clear speech: Korean speakers of English","volume":"154","author":"Jung","year":"2023","journal-title":"Speech Comm."},{"key":"ref16","doi-asserted-by":"publisher","first-page":"1672","DOI":"10.1121\/1.2166607","article-title":"Phonological systems in bilinguals: age of learning effects on the stop consonant systems of Korean-English bilinguals","volume":"119","author":"Kang","year":"2006","journal-title":"J. Acoust. Soc. Am."},{"key":"ref17","doi-asserted-by":"publisher","first-page":"3909","DOI":"10.1121\/1.2988292","article-title":"Clear speech production of Korean stops: changing phonetic targets and enhancement strategies","volume":"124","author":"Kang","year":"2008","journal-title":"J. Acoust. Soc. Am."},{"key":"ref18","doi-asserted-by":"publisher","first-page":"1246","DOI":"10.1121\/10.0009403","article-title":"Perceptual consequences of native and non-native clear speech","volume":"151","author":"Kato","year":"2022","journal-title":"J. Acoust. Soc. Am."},{"key":"ref19","doi-asserted-by":"publisher","first-page":"40","DOI":"10.1177\/00238309231156615","article-title":"The effects of acoustic and semantic enhancements on perception of native and non-native speech","volume":"67","author":"Kato","year":"2024","journal-title":"Lang. Speech"},{"key":"ref20","doi-asserted-by":"publisher","first-page":"143","DOI":"10.1006\/jpho.1996.0039","article-title":"Effects of speaking rate on voice-onset time in Thai, French, and English","volume":"25","author":"Kessinger","year":"1997","journal-title":"J. Phon."},{"key":"ref21","first-page":"29","article-title":"Correlation of acoustic cues in stop productions of Korean and English adults and children","volume":"2","author":"Kong","year":"2010","journal-title":"Phonet. Speech Sci."},{"key":"ref22","doi-asserted-by":"publisher","first-page":"362","DOI":"10.1121\/1.1635842","article-title":"Acoustic properties of naturally produced clear speech at normal speaking rates","volume":"115","author":"Krause","year":"2004","journal-title":"J. Acoust. Soc. Am."},{"key":"ref23","doi-asserted-by":"publisher","first-page":"1","DOI":"10.18637\/jss.v082.i13","article-title":"lmerTest package: tests in linear mixed effects models","volume":"82","author":"Kuznetsova","year":"2017","journal-title":"J. Stat. Softw."},{"key":"ref25","author":"Lenth","year":"2018"},{"key":"ref26","author":"Li","year":"2006"},{"key":"ref27","doi-asserted-by":"crossref","first-page":"403","DOI":"10.1007\/978-94-009-2037-8_16","article-title":"Explaining phonetic variation: a sketch of the H&H theory","volume-title":"Speech production and speech modelling","author":"Lindblom","year":"1990"},{"key":"ref28","doi-asserted-by":"publisher","first-page":"384","DOI":"10.1080\/00437956.1964.11659830","article-title":"A cross-language study of voicing in initial stops: acoustical measurements","volume":"20","author":"Lisker","year":"1964","journal-title":"Word"},{"key":"ref29","doi-asserted-by":"publisher","first-page":"488","DOI":"10.1111\/j.1944-9720.2010.01094.x","article-title":"The combined effects of immersion and instruction on second language pronunciation","volume":"43","author":"Lord","year":"2010","journal-title":"Foreign Lang. Ann."},{"key":"ref30","doi-asserted-by":"publisher","first-page":"1559","DOI":"10.3758\/s13414-018-1537-4","article-title":"Coping with adversity: individual differences in the perception of noisy and accented speech","volume":"80","author":"McLaughlin","year":"2018","journal-title":"Atten. Percept. Psychophysiol."},{"key":"ref31","doi-asserted-by":"publisher","first-page":"106","DOI":"10.1159\/000261764","article-title":"Speaking rate and segments: a look at the relation between speech production and speech perception for the voicing contrast","volume":"43","author":"Miller","year":"1986","journal-title":"Phonetica"},{"key":"ref32","doi-asserted-by":"publisher","first-page":"479","DOI":"10.1111\/j.1467-9922.2008.00448.x","article-title":"Segmental acquisition in adult ESL learners: a longitudinal study of vowel production","volume":"58","author":"Munro","year":"2008","journal-title":"Lang. Learn."},{"key":"ref33","first-page":"39","article-title":"Voice onset time of Korean stops as a function of speaking rate","volume":"1","author":"Oh","year":"2009","journal-title":"Phonet. Speech Sci."},{"key":"ref34","doi-asserted-by":"publisher","first-page":"521","DOI":"10.1177\/02655322221139162","article-title":"Measuring bilingual language dominance: an examination of the reliability of the bilingual language profile","volume":"40","author":"Olson","year":"2023","journal-title":"Lang. Test."},{"key":"ref35","doi-asserted-by":"publisher","first-page":"434","DOI":"10.1044\/jshr.2904.434","article-title":"Speaking clearly for the hard of hearing II: acoustic characteristics of clear and conversational speech","volume":"29","author":"Picheny","year":"1986","journal-title":"J. Speech Lang. Hear. Res."},{"key":"ref36","year":"2019"},{"key":"ref37","doi-asserted-by":"publisher","first-page":"410","DOI":"10.1121\/1.3436523","article-title":"Conversational and clear speech intelligibility of \/bVd\/ syllables produced by native and non-native English speakers","volume":"128","author":"Rogers","year":"2010","journal-title":"J. Acoust. Soc. Am."},{"key":"ref38","doi-asserted-by":"publisher","first-page":"53","DOI":"10.1016\/j.specom.2019.03.001","article-title":"Why listening in background noise is harder in a non-native language than in a native language: a review","volume":"108","author":"Scharenborg","year":"2019","journal-title":"Speech Comm."},{"key":"ref9002","doi-asserted-by":"crossref","first-page":"1","DOI":"10.36366\/frontiers.v10i1.130","article-title":"A comparison of Spanish second language acquisition in two different learning contexts: Study abroad and the domestic classroom","volume":"10","author":"Segalowitz","year":"2004","journal-title":"Interdisciplinary Journal of Study Abroad"},{"key":"ref39","doi-asserted-by":"publisher","first-page":"287","DOI":"10.1017\/S0952675706000911","article-title":"Acoustic evidence for the emergence of tonal contrast in contemporary Korean","volume":"23","author":"Silva","year":"2006","journal-title":"Phonology"},{"key":"ref40","doi-asserted-by":"publisher","first-page":"1677","DOI":"10.1121\/1.2000788","article-title":"Production and perception of clear speech in Croatian and English","volume":"118","author":"Smiljanic","year":"2005","journal-title":"J. Acoust. Soc. Am."},{"key":"ref41","doi-asserted-by":"publisher","first-page":"4020","DOI":"10.1121\/1.3652882","article-title":"Bidirectional clear speech perception benefit for native and high-proficiency non-native talkers and listeners: intelligibility and accentedness","volume":"130","author":"Smiljanic","year":"2011","journal-title":"J. Acoust. Soc. Am."},{"key":"ref42","doi-asserted-by":"publisher","first-page":"103","DOI":"10.1016\/S0167-6393(00)00098-4","article-title":"Intelligibility of native and non-native Dutch speech","volume":"35","author":"Van Wijngaarden","year":"2001","journal-title":"Speech Comm."},{"key":"ref43","doi-asserted-by":"publisher","first-page":"36","DOI":"10.1159\/000261851","article-title":"Gradient effects of fundamental frequency on stop consonant voicing judgments","volume":"47","author":"Whalen","year":"1990","journal-title":"Phonetica"},{"key":"ref44","doi-asserted-by":"publisher","first-page":"2152","DOI":"10.1121\/1.406678","article-title":"F0 gives voicing information even with unambiguous voice onset times","volume":"93","author":"Whalen","year":"1993","journal-title":"J. Acoust. Soc. Am."}],"container-title":["Frontiers in Human Neuroscience"],"original-title":[],"link":[{"URL":"https:\/\/www.frontiersin.org\/articles\/10.3389\/fnhum.2024.1413886\/full","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2024,9,13]],"date-time":"2024-09-13T11:57:47Z","timestamp":1726228667000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.frontiersin.org\/articles\/10.3389\/fnhum.2024.1413886\/full"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2024,9,13]]},"references-count":42,"alternative-id":["10.3389\/fnhum.2024.1413886"],"URL":"https:\/\/doi.org\/10.3389\/fnhum.2024.1413886","relation":{},"ISSN":["1662-5161"],"issn-type":[{"value":"1662-5161","type":"electronic"}],"subject":[],"published":{"date-parts":[[2024,9,13]]},"article-number":"1413886"}}