Nonnative (L2) English learners are often assumed to exhibit greater speech production variability than native
(L1) speakers; however, support for this assumption is primarily limited to secondary observations rather than having been the
specific focus of empirical investigations. The present study examined intra-speaker variability associated with L2 English
learners’ tense and lax vowel productions to determine whether they showed comparable or greater intra-speaker variability than
native English speakers. First and second formants of three tense/lax vowel pairs were measured, and Coefficient of Variation was
calculated for 10 native speakers of American English and 30 nonnative speakers. The L2 speakers’ vowel formants were found to be
native-like approximately half of the time. Whether their formants were native-like or not, however, they seldom showed greater
intra-speaker variability than the L1 speakers.
(2004) A comparison of vowel normalization procedures for language variation research. Journal of the Acoustical Society of America, 1161, 3099–3107.
Baese-Berk, M., & Morrill, T. H.
(2015) Speaking rate consistency in native and non-native speakers of English. Journal of the Acoustical Society of America, 1381, 223–228.
Baker, R. E., Baese-Berk, M., Bonnasse-Gahot, L., Kim, M., Van Engen, K. J., & Bradlow, A. R.
(2011) Word durations in non-native English. Journal of Phonetics, 391, 1–17.
Best, C. T.
(1995) A direct realist perspective on cross-language speech perception. In W. Strange (Ed.), Speech perception and linguistic experience: Issues in cross-language research (pp. 167–200). Timonium, MD: York Press.
Boersma, P., & Weenink, D.
(2012) Praat: doing phonetics by computer [Computer program, version 5.3.23], retrieved from [URL]
Bohn, O.-S., & Flege, J. E.
(1992) The production of new and similar vowels by adult German Learners of English. Studies in Second Language Acquisition, 141, 131–158.
Bond, Z. S., & Moore, T. J.
(1994) A note on the acoustic-phonetic characteristics of inadvertently clear speech. Speech Communication, 141, 325–337.
Bongaerts, T.
(1999) Ultimate attainment in L2 pronunciation: The case of very advanced late L2 learners. In D. Birdsong (Ed.), Second language acquisition and the critical period hypothesis (pp. 133–158). Mahwah, NJ: Lawrence Erlbaum Associates.
Bosch, L., & Ramon-Casas, M.
(2011) Variability in vowel production by bilingual speakers: Can input properties hinder the early stabilization of contrastive categories?Journal of Phonetics, 391, 514–526.
Bradlow, A. R.
(1995) A comparative acoustic study of English and Spanish vowels. Journal of the Acoustical Society of America, 971, 1916–1924.
Bradlow, A. R., & Bent, T.
(2002) The clear speech effect for non-native listeners. Journal of the Acoustical Society of America, 1121, 272–284.
Cebrian, J.
(2006) Experience and the use of non-native duration in L2 vowel categorization. Journal of Phonetics, 341, 372–387.
Chang, D., & Weng, C.
(2013) Late ESL learners’ difficulties of distinction between lax and tense vowels. In J. Levis and K. LeVelle (Eds.). Proceedings of the 4th Pronunciation in Second Language Learning and Teaching Conference (pp. 129–139). Ames, IA: Iowa State University.
Cook, V.
(2015) Where is the native speaker now?TESOL Quarterly, 501, 186–189.
Ferguson, S. H.
(2004) Talker differences in clear and conversational speech: Vowel intelligibility for normal-hearing listeners. Journal of the Acoustical Society of America, 1161, 2365–2373.
Flege, J. E.
(1995) Second language speech learning: Theory, findings, and problems. In W. Strange (Ed.), Speech perception and linguistic experience: Issues in cross-language research (pp. 233–277). Timonium, MD: York Press.
Flege, J. E., & Hillenbrand, J.
(1984) Limits on accuracy in foreign language speech production. Journal of the Acoustical Society of America, 761, 708–721.
Flege, J. E., MacKay, I. R. A., & Meador, D.
(1999) Native Italian speakers’ perception and production of English vowels. Journal of the Acoustical Society of America, 1061, 2973–2987.
Flege, J. E., Munro, M. J., & MacKay, I. R. A.
(1995) Factors affecting strength of perceived foreign accent in a second language. Journal of the Acoustical Society of America, 971, 3125–3134.
Flege, J. E., Schirru, C., & MacKay, I. R. A.
(2003) Interaction between the native and second language phonetic subsystems. Speech Communication, 401, 467–491.
Goldinger, S. D., & Azuma, T.
(2003) Puzzle-solving science: The quixotic quest for units in speech perception. Journal of Phonetics, 311, 305–320.
Hattori, K., & Iverson, P.
(2009) English /r/ – /l/ category assimilation by Japanese adults: Individual differences and the link to identification accuracy. Journal of the Acoustical Society of America, 1251, 469–479.
Hillenbrand, J., Getty, L. A., Clark, M. J., & Wheeler, K.
(1995) Acoustic characteristics of American English vowels. Journal of the Acoustical Society of America, 971, 3099–3111.
(2006) Perception and production of English vowels by Mandarin speakers: age-related differences vary with amount of L2 exposure. Journal of the Acoustical Society of America, 1191, 1118–1130.
Kartushina, N., & Frauenfelder, U. H.
(2014) On the effects of L2 perception and of individual differences in L1 production on L2 pronunciation. Frontiers in Psychology, 51, 1246.
Koenig, L. L., Lucero, J. C., & Perlman, E.
(2008) Speech production variability in fricatives of children and adults: Results of functional data analysis. Journal of the Acoustical Society of America, 1241, 3158–3170.
Kondaurova, M. V., & Francis, A. L.
(2008) The relationship between native allophonic experience with vowel duration and perception of the English tense/lax vowel contrast by Spanish and Russian listeners. Journal of the Acoustical Society of America, 1241, 3959–3971.
Larsen-Freeman, D.
(2006) The emergence of complexity, fluency, and accuracy in the oral and written production of five Chinese learners of English. Applied Linguistics, 271, 590–619.
Lotto, A., Sato, M., & Diehl, R. L.
(2004) Mapping the task for the second language learner: The case of the Japanese acquisition of /r/ and /l/. In J. Slifka, S. Manuel, and M. Matthies (Eds.), From sound to sense: 50+ years of discoveries in speech communication (pp. 181–186). Cambridge MA: MIT Press.
Moyer, A.
(1999) Ultimate attainment in L2 phonology. Studies in Second Language Acquisition, 211, 81–108.
Piske, T., MacKay, I. R. A., & Flege, J. E.
(2001) Factors affecting degree of foreign accent in an L2: A review. Journal of Phonetics, 291, 191–215.
Peterson, G. E., & Barney, H. L.
(1952) Control methods used in a study of the vowels. Journal of the Acoustical Society of America, 241, 175–184.
Rallo Fabra, L., & Romero, J.
(2012) Native Catalan learners’ perception and production of English vowels. Journal of Phonetics, 401, 491–508.
Romeo, R., Hazan, V., & Pettinato, M.
(2013) Developmental and gender-related trends of intra-talker variability in consonant production. Journal of the Acoustical Society of America, 1341, 3781–3792.
Schertz, J., Cho, T., Lotto, A., & Warner, N.
(2015) Individual differences in phonetic cue use in production and perception of a nonnative sound contrast. Journal of Phonetics, 521, 183–204.
Seddoh, S. A. K., Robin, D. A., Hageman, C., Sim, H.-S., Moon, J. B., & Folkins, J. W.
(1996) Temporal control in apraxia of speech: an acoustic investigation of token-to-token variability. Clinical Aphasiology, 241, 65–81.
Sharkey, S. G., & Folkins, J. W.
(1985) Variability of lip and jaw movements in children and adults: Implications for the development of speech motor control. Journal of Speech and Hearing Research, 281, 8–15.
Slevc, L. R., & Miyake, A.
(2006) Individual differences in second-language proficiency: Does musical ability matter?Psychological Science, 171, 675–681.
Smith, A.
(2006) Speech motor development: Integrating muscles, movements, and linguistic units. Journal of Communication Disorders, 391, 331–349.
Smith, B. L.
(2000) Variations in temporal patterns of speech production among speakers of English. Journal of the Acoustical Society of America, 1081, 2438–2442.
Smith, B. L., Hayes-Harb, R., Bruss, M., & Harker, A.
(2009) Production and perception of voicing and devoicing in similar German and English word pairs by native speakers of German. Journal of Phonetics, 371, 257–275.
Strange, W., Weber, A., Levy, E. S., Shafiro, V., & Hisagi, M.
(2007) Acoustic variability within and across German, French, and American English vowels: Phonetic context effects. Journal of the Acoustical Society of America, 1221, 3728–3737.
Syrdal, A. K. and Gopal, H. S.
(1986) A perceptual model of vowel recognition based on the auditory representation of American English vowels. Journal of the Acoustical Society of America, 791, 1086–1100.
Thomas, E. R. and Kendall, T.
(2007) NORM: The vowel normalization and plotting suite. [Online Resource: [URL]]
Tingley, B. M., & Allen, G. D.
(1975) Development of speech timing control in children. Child Development, 461, 186–194.
Verspoor, M., Lowie, W. & Van Dijk, M.
(2008) Variability in second language development from a dynamic systems perspective. The Modern Language Journal, 921, 214–231.
Wade, T., Jongman, A., & Sereno, J.
(2007) Effects of acoustic variability in the perceptual learning of nonnative-accented speech sounds. Phonetica, 641, 122–144.
Warner, N., & Tucker, B. V.
(2011) Phonetic variability of stops and flaps in spontaneous and careful speech. Journal of the Acoustical Society of America, 1301, 1606–1617.
Witteman, M. J., Weber, A., & McQueen, J. M.
(2014) Tolerance for inconsistency in foreign-accented speech. Psychonomic Bulletin & Review, 21(2), 512–519.
Cited by
Cited by 4 other publications
Feng, Xiaoli, Yingming Gao, Jinsong Zhang & Yanchun Cao
2022. 2022 13th International Symposium on Chinese Spoken Language Processing (ISCSLP), ► pp. 414 ff.
Tan, Maryann, Xin Xie & T. Florian Jaeger
2021. Using Rational Models to Interpret the Results of Experiments on Accent Adaptation. Frontiers in Psychology 12
Valenzuela, Maria Gabriela & Peter French
2023. Production of English Vowel Contrasts in Spanish L1 Learners: A Longitudinal Study. Loquens 10:1-2 ► pp. e102 ff.
Xie, Xin & T. Florian Jaeger
2020. Comparing non-native and native speech: Are L2 productions more variable?. The Journal of the Acoustical Society of America 147:5 ► pp. 3322 ff.
This list is based on CrossRef data as of 3 june 2024. Please note that it may not be complete. Sources presented here have been supplied by the respective publishers.
Any errors therein should be reported to them.