{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,16]],"date-time":"2026-01-16T19:26:47Z","timestamp":1768591607607,"version":"3.49.0"},"reference-count":65,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2025,6,20]],"date-time":"2025-06-20T00:00:00Z","timestamp":1750377600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"UCLA COR Faculty Research Grant","award":["UID\/00214"],"award-info":[{"award-number":["UID\/00214"]}]},{"name":"Centro de Lingu\u00edstica da Universidade de Lisboa","award":["UID\/00214"],"award-info":[{"award-number":["UID\/00214"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Languages"],"abstract":"<jats:p>In four experiments, we investigated when and how English-learning infants perceive intonation contours that signal prosodic units. Using visual habituation, we probed infants\u2019 ability to discriminate disyllabic sequences with a fall versus a rise in pitch on the final syllable, a salient cue used to distinguish statements from questions. First, we showed that at 8 months, English-learning infants can distinguish statement falls from question rises, as has been reported previously for their European Portuguese-learning peers who have extensive experience with minimal pairs that differ just in pitch rises and falls. Next, we conducted three experiments involving 4-month-olds to determine the developmental roots of how English-learning infants begin to tune into these intonation contours. In Experiment 2, we showed that unlike 8-month-olds, monolingual English-learning 4-month-olds are unable to distinguish statement and question intonation when they are presented with segmentally varied disyllabic sequences. Monolingual English-learning 4-month-olds only partially succeeded even when tested without segmental variability and a sensitive testing procedure (Experiment 3). When tested with stimuli that had been resynthesized to remove correlated duration cues as well, 4-month-olds demonstrated only partial success (Experiment 4). We discuss our results in the context of extant developmental research on how infants tune into linguistically relevant pitch cues in their first year of life.<\/jats:p>","DOI":"10.3390\/languages10070148","type":"journal-article","created":{"date-parts":[[2025,6,20]],"date-time":"2025-06-20T03:05:27Z","timestamp":1750388727000},"page":"148","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["English-Learning Infants\u2019 Developing Sensitivity to Intonation Contours"],"prefix":"10.3390","volume":"10","author":[{"given":"Megha","family":"Sundara","sequence":"first","affiliation":[{"name":"Department of Linguistics, University of California, Los Angeles, CA 90095, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6102-0772","authenticated-orcid":false,"given":"S\u00f3nia","family":"Frota","sequence":"additional","affiliation":[{"name":"Center of Linguistics, Universidade de Lisboa, 1600-214 Lisbon, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2025,6,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Abboub, N., Boll-Avetisyan, N., Bhatara, A., H\u00f6hle, B., and Nazzi, T. (2016). An exploration of rhythmic grouping of speech sequences by French- and German-learning infants. Frontiers in Human Neuroscience, 10.","DOI":"10.3389\/fnhum.2016.00292"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"255","DOI":"10.1016\/j.jml.2012.11.001","article-title":"Random effects structure for confirmatory hypothesis testing: Keep it maximal","volume":"68","author":"Barr","year":"2013","journal-title":"Journal of Memory and Language"},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Beckman, M. E. (1986). Stress and non-stress accent, Foris.","DOI":"10.1515\/9783110874020"},{"key":"ref_4","unstructured":"Best, C. T., Levitt, A., and McRoberts, G. W. (, January August). Examination of language-specific influences in infants\u2019 discrimination of prosodic categories. The XIIth International Congress of Phonetic Sciences, Aix-en-Provence, France."},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Bijeljac-Babic, R., Serres, J., H\u00f6hle, B., and Nazzi, T. (2012). Effect of bilingualism on lexical stress pattern discrimination in French-learning infants. PLoS ONE, 7.","DOI":"10.1371\/journal.pone.0030843"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"123","DOI":"10.1177\/0023830910388018","article-title":"Acoustic markers of prominence influence infants\u2019 and adults\u2019 segmentation of speech sequences","volume":"54","author":"Bion","year":"2011","journal-title":"Language and Speech"},{"key":"ref_7","first-page":"341","article-title":"Praat, a system for doing phonetics by computer","volume":"5","author":"Boersma","year":"2001","journal-title":"Glot International"},{"key":"ref_8","doi-asserted-by":"crossref","unstructured":"Bolinger, D. (1989). Intonation and its uses: Melody in grammar and discourse, Stanford University Press.","DOI":"10.1515\/9781503623125"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"31","DOI":"10.1080\/15248372.2013.833923","article-title":"Prosody in infant-directed speech is similar across western and traditional cultures","volume":"16","author":"Broesch","year":"2015","journal-title":"Journal of Cognition and Development"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1080\/15475441.2015.1020376","article-title":"Infants\u2019 perception of broad and narrow focus","volume":"12","author":"Butler","year":"2016","journal-title":"Language Learning and Development"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"426","DOI":"10.1002\/icd.1944","article-title":"Discrimination of lexical tones in the first year of life","volume":"25","author":"Chen","year":"2016","journal-title":"Infant and Child Development"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"795","DOI":"10.1111\/infa.12257","article-title":"Intonation plays a role in language discrimination by infants","volume":"23","author":"Chong","year":"2018","journal-title":"Infancy"},{"key":"ref_13","unstructured":"Cohen, L. B., Atkinson, D. J., and Chaput, H. H. (2004). Habit X: A new program for obtaining and organizing data in infant perception and cognition studies (Version 1.0), University of Texas."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"101","DOI":"10.1121\/1.399955","article-title":"Articulation rate and the duration of syllables and stress groups in connected speech","volume":"88","author":"Crystal","year":"1990","journal-title":"The Journal of the Acoustical Society of America"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"521","DOI":"10.1037\/dev0000083","article-title":"Statistical treatment of looking-time data","volume":"52","author":"Csibra","year":"2016","journal-title":"Developmental Psychology"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"92","DOI":"10.3758\/s13414-012-0371-3","article-title":"Do humans and nonhuman animals share the grouping principles of the iambic-trochaic law?","volume":"75","author":"Nespor","year":"2013","journal-title":"Attention, Perception & Psychophysics"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"279","DOI":"10.1016\/0163-6383(87)90017-8","article-title":"Acoustic determinants of infant preference for motherese speech","volume":"10","author":"Fernald","year":"1987","journal-title":"Infant Behavior and Development"},{"key":"ref_18","doi-asserted-by":"crossref","unstructured":"Jun, S.-A. (2014). The intonational phonology of European Portuguese. Prosodic typology II: The phonology of intonation and phrasing, Oxford University Press.","DOI":"10.1093\/acprof:oso\/9780199567300.001.0001"},{"key":"ref_19","unstructured":"Frota, S., Butler, J., Lu, S., and Vig\u00e1rio, M. (3, January May). Infants\u2019 perception of native and non-native pitch contrasts. The Speech Prosody Conference, Boston, MA, USA."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"194","DOI":"10.1111\/infa.12037","article-title":"Infants\u2019 perception of intonation: Is it a statement or a question?","volume":"19","author":"Frota","year":"2014","journal-title":"Infancy"},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Frota, S., and Prieto, P. (2015). Intonation in romance, Oxford University Press.","DOI":"10.1093\/acprof:oso\/9780199685332.001.0001"},{"key":"ref_22","unstructured":"Geffen, S. (2014). When and how infants discriminate between declaratives and interrogatives, University of Southern California."},{"key":"ref_23","unstructured":"Geffen, S., and Mintz, T. (2015). Seven-month-olds discrimination of statements and questions. Proceedings of the 36th Boston university conference on language development, Cascadilla Press."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"968","DOI":"10.1017\/S0305000916000349","article-title":"Prosodic differences between declaratives and interrogatives in infant-directed speech","volume":"44","author":"Geffen","year":"2017","journal-title":"Journal of Child Language"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"610","DOI":"10.1111\/j.1532-7078.2011.00110.x","article-title":"Rhythmic grouping biases constrain infant statistical learning","volume":"17","author":"Hay","year":"2012","journal-title":"Infancy"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"504","DOI":"10.3758\/BF03214363","article-title":"Cross-language word segmentation by 9-month-olds","volume":"7","author":"Houston","year":"2000","journal-title":"Psychonomic Bulletin & Review"},{"key":"ref_27","first-page":"262","article-title":"The development of language specific prosodic preferences during the first half year of life: Evidence from German and French","volume":"2","author":"Herold","year":"2009","journal-title":"Infant Behavior & Development"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"440","DOI":"10.1080\/15250000802329321","article-title":"Clause segmentation by 6-month-old infants: A cross-linguistic perspective","volume":"15","author":"Johnson","year":"2008","journal-title":"Infancy"},{"key":"ref_29","doi-asserted-by":"crossref","unstructured":"Jun, S.-A. (2005). Prosodic typology: The phonology of intonation and phrasing, Oxford University Press.","DOI":"10.1093\/acprof:oso\/9780199249633.001.0001"},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Jun, S.-A. (2014). Prosodic typology II, Oxford University Press.","DOI":"10.1093\/acprof:oso\/9780199567300.001.0001"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"e13459","DOI":"10.1111\/desc.13459","article-title":"The development of tone discrimination in infancy: Evidence from a cross-linguistic, multi-lab report","volume":"27","author":"Kalashnikova","year":"2024","journal-title":"Developmental Science"},{"key":"ref_32","doi-asserted-by":"crossref","unstructured":"Ladd, R. D. (2008). Intonational phonology, Cambridge University Press.","DOI":"10.1017\/CBO9780511808814"},{"key":"ref_33","unstructured":"Lenth, R. V. (2025, February 08). Emmeans: Estimated marginal means, aka least-squares means. R package version 1.11.1-00001, Available online: https:\/\/rvlenth.github.io\/emmeans\/."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"385","DOI":"10.1016\/j.cognition.2014.06.004","article-title":"Perception of tones by infants learning a non-tone language","volume":"133","author":"Liu","year":"2014","journal-title":"Cognition"},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"102003","DOI":"10.1016\/j.infbeh.2024.102003","article-title":"Developmental trajectories of non-native tone perception differ between monolingual and bilingual infants learning a pitch accent language","volume":"77","author":"Liu","year":"2024","journal-title":"Infant Behavior & Development"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"241","DOI":"10.1207\/s15327078in1003_3","article-title":"Chinese and English infants\u2019 tone perception: Evidence for perceptual reorganization","volume":"10","author":"Mattock","year":"2006","journal-title":"Infancy"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"1367","DOI":"10.1016\/j.cognition.2007.07.002","article-title":"The developmental course of lexical tone perception in the first year of life","volume":"106","author":"Mattock","year":"2008","journal-title":"Cognition"},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"779","DOI":"10.1016\/S0163-6383(98)90044-3","article-title":"Discrimination of pitch contours by neonates","volume":"21","author":"Nazzi","year":"1998","journal-title":"Infant Behavior & Development"},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"255","DOI":"10.1080\/15248371003699977","article-title":"Using habituation of looking time to assess mental processes in infancy","volume":"11","author":"Oakes","year":"2010","journal-title":"Journal of Cognition and Development"},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"539","DOI":"10.1016\/0163-6383(90)90022-Z","article-title":"Infant responses to prototypical melodic contours in parental speech","volume":"13","author":"Bornstein","year":"1990","journal-title":"Infant Behavior and Development"},{"key":"ref_41","doi-asserted-by":"crossref","unstructured":"Cohen, P. R., Morgan, J., and Pollack, M. E. (1990). The Meaning of Intonational contours in the interpretation of discourse. Intentions in communication, MIT Press.","DOI":"10.7551\/mitpress\/3839.001.0001"},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"290","DOI":"10.1017\/S0305000917000228","article-title":"No perceptual reorganization for Limburgian tones? A cross-linguistic investigation with 6- to 12-month-old infants","volume":"45","author":"Ramachers","year":"2018","journal-title":"Journal of Child Language"},{"key":"ref_43","unstructured":"R Core Team (2021). R: A language and environment for statistical computing, R Foundation for Statistical Computing."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"3","DOI":"10.1037\/0012-1649.33.1.3","article-title":"Newborns discriminate the rhythm of multisyllabic stressed words","volume":"33","author":"Sansavini","year":"1997","journal-title":"Developmental Psychology"},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"2503","DOI":"10.1162\/jocn.2009.21377","article-title":"Development of hemispheric specialization for lexical pitch-accent in Japanese infants","volume":"22","author":"Sato","year":"2009","journal-title":"Journal of Cognitive Neuroscience"},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"24","DOI":"10.1016\/j.jml.2006.10.004","article-title":"Infants\u2019 use and weighting of prosodic cues in clause segmentation","volume":"57","author":"Seidl","year":"2007","journal-title":"Journal of Memory & Language"},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"596","DOI":"10.1111\/j.1467-7687.2008.00704.x","article-title":"Developmental weighting in the weighting of prosodic cues","volume":"11","author":"Seidl","year":"2008","journal-title":"Developmental Science"},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"790","DOI":"10.1111\/infa.12191","article-title":"Perception of similar and dissimilar lexical tones by non-tone-learning infants","volume":"22","author":"Shi","year":"2017","journal-title":"Infancy"},{"key":"ref_49","doi-asserted-by":"crossref","first-page":"59","DOI":"10.1016\/j.jecp.2018.03.012","article-title":"Developmental change in tone perception in Mandarin monolingual, English monolingual, and Mandarin-English bilingual infants: Divergences between monolingual and bilingual learners","volume":"173","author":"Singh","year":"2018","journal-title":"Journal of Experimental Child Psychology"},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"EL50","DOI":"10.1121\/1.3590169","article-title":"English-learning infants\u2019 perception of word stress patterns","volume":"130","author":"Skoruppa","year":"2011","journal-title":"Journal of Acoustic Society of America"},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"88","DOI":"10.1080\/15475441.2012.693881","article-title":"The development of word stress processing in French and Spanish infants","volume":"9","author":"Skoruppa","year":"2013","journal-title":"Language Learning and Development"},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"914","DOI":"10.1111\/j.1467-7687.2009.00835.x","article-title":"Language-specific stress perception by 9-month-old French and Spanish infants","volume":"12","author":"Skoruppa","year":"2009","journal-title":"Developmental Science"},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"107","DOI":"10.1016\/j.infbeh.2010.10.003","article-title":"It\u2019s a question? Infants attend differently to yes\/no questions and declaratives","volume":"34","author":"Soderstrom","year":"2011","journal-title":"Infant Behavior & Development"},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"224","DOI":"10.1044\/jshr.2002.224","article-title":"Discrimination of linguistic stress in early infancy","volume":"20","author":"Spring","year":"1977","journal-title":"Journal of Speech Hearing Research"},{"key":"ref_55","unstructured":"Little, H. (2015). The perception of boundary tones in infancy. Proceedings of the 18th international congress of phonetic sciences, International Congress of Phonetic Sciences."},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"57","DOI":"10.1016\/j.cognition.2018.05.009","article-title":"Young infants\u2019 discrimination of subtle phonetic contrasts","volume":"178","author":"Sundara","year":"2018","journal-title":"Cognition"},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"505","DOI":"10.1016\/j.wocn.2010.08.006","article-title":"Rhythmic distance between languages affects the development of speech perception in bilingual infants","volume":"39","author":"Sundara","year":"2011","journal-title":"Journal of Phonetics"},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"706","DOI":"10.1037\/0012-1649.39.4.706","article-title":"When cues collide: Use of statistical and stress cues to word boundaries by 7- and 9-month-old infants","volume":"39","author":"Thiessen","year":"2003","journal-title":"Developmental Psychology"},{"key":"ref_59","doi-asserted-by":"crossref","first-page":"188","DOI":"10.1111\/1467-9280.00240","article-title":"Is infant-directed speech prosody a result of the vocal expression of emotion?","volume":"11","author":"Trainor","year":"2000","journal-title":"Psychological Sciences"},{"key":"ref_60","first-page":"821","article-title":"Infants\u2019 perception of melodies: The role of melodic contour","volume":"55","author":"Trehub","year":"1984","journal-title":"Child Development"},{"key":"ref_61","doi-asserted-by":"crossref","unstructured":"Tsao, F.-M. (2017). Perceptual improvement of lexical tones in infants: Effects of tone language experience. Frontiers in Psychology, 8.","DOI":"10.3389\/fpsyg.2017.00558"},{"key":"ref_62","doi-asserted-by":"crossref","first-page":"104108","DOI":"10.1016\/j.jml.2020.104108","article-title":"Language-specific prosodic acquisition: A comparison of phrase boundary perception by French- and German-learning infants","volume":"112","author":"Larraza","year":"2020","journal-title":"Journal of Memory and Language"},{"key":"ref_63","doi-asserted-by":"crossref","unstructured":"Wellmann, C., Holzgrefe, J., Truckenbrodt, H., Wartenburger, I., and H\u00f6hle, B. (2012). How each prosodic boundary cue matters: Evidence from German infants. Frontiers in Psychology, 3.","DOI":"10.3389\/fpsyg.2012.00580"},{"key":"ref_64","doi-asserted-by":"crossref","first-page":"123","DOI":"10.1016\/j.jml.2012.09.004","article-title":"When does native language input affect phonetic perception? The precocious case of lexical tone","volume":"68","author":"Yeung","year":"2013","journal-title":"Journal of Memory and Language"},{"key":"ref_65","doi-asserted-by":"crossref","first-page":"356","DOI":"10.1016\/j.cognition.2010.01.005","article-title":"The development of perceptual grouping biases in infancy: A Japanese-English cross-linguistic study","volume":"115","author":"Yoshida","year":"2010","journal-title":"Cognition"}],"container-title":["Languages"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2226-471X\/10\/7\/148\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,9]],"date-time":"2025-10-09T17:55:23Z","timestamp":1760032523000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2226-471X\/10\/7\/148"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,6,20]]},"references-count":65,"journal-issue":{"issue":"7","published-online":{"date-parts":[[2025,7]]}},"alternative-id":["languages10070148"],"URL":"https:\/\/doi.org\/10.3390\/languages10070148","relation":{},"ISSN":["2226-471X"],"issn-type":[{"value":"2226-471X","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,6,20]]}}}