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  • Kazuya Saito (a1)

The current project examined whether and to what degree age of acquisition (AOA), defined as the first intensive exposure to a second language (L2) environment, can be predictive of the end state of postpubertal L2 oral proficiency attainment. Data were collected from 88 experienced Japanese learners of English and two groups of 20 baseline speakers (inexperienced Japanese speakers and native English speakers). The global quality of their spontaneous speech production was first judged by 10 native English-speaking raters based on accentedness (linguistic nativelikeness) and comprehensibility (ease of understanding) and was then submitted to segmental, prosodic, temporal, lexical, and grammatical analyses. According to the results, AOA was negatively correlated with the accentedness and comprehensibility components of L2 speech production, owing to relatively strong age effects on segmental and prosodic attainment. Yet significant age effects were not observed in the case of fluency and lexicogrammar attainment. The results suggest that AOA plays a key role in determining the extent to which learners can attain advanced-level L2 oral abilities via improving the phonological domain of language (e.g., correct consonant and vowel pronunciation and adequate and varied prosody) and that the temporal and lexicogrammatical domains of language (e.g., optimal speech rate and proper vocabulary and grammar usage) may be enhanced with increased L2 experience, regardless of age.

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*Correspondence concerning this article should be addressed to Kazuya Saito, Birkbeck, University of London, Department of Applied Linguistics and Communication, 30 Russell Square, London WC1B 5DT, UK. E-mail:
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Abrahamsson, N. (2012). Age of onset and nativelike L2 ultimate attainment of morphosyntactic and phonetic intuition. Studies in Second Language Acquisition, 34, 187214.
Abrahamsson, N., & Hyltenstam, K. (2008). The robustness of aptitude effects in near-native second language acquisition. Studies in Second Language Acquisition, 30, 481509.
Abrahamsson, N., & Hyltenstam, K. (2009). Age of onset and nativelikeness in a second language: Listener perception versus linguistic scrutiny. Language Learning, 59, 249306.
Anderson, J. R. (1993). Rules of the mind. Hillsdale, NJ: Erlbaum.
Baker, W., Trofimovich, P., Flege, J. E., Mack, M., & Halter, R. (2008). Child-adult differences in second-language phonological learning: The role of cross-language similarity. Language and Speech, 51, 316341.
Best, C., & Tyler, M. (2007). Nonnative and second-language speech perception. In Bohn, O. & Munro, M. (Eds.), Language experience in second language speech learning: In honour of James Emil Flege (pp. 1334). Amsterdam, the Netherlands: Benjamins.
Bialystok, E. (1997). The structure of age: In search of barriers to second language acquisition. Second Language Research, 13, 116137.
Bialystok, E., Craik, F. I., Klein, R., & Viswanathan, M. (2004). Bilingualism, aging, and cognitive control: Evidence from the Simon task. Psychology and Aging, 19, 290303.
Bialystok, E., & Miller, B. (1999). The problem of age in second-language acquisition: Influences from language, structure, and task. Bilingualism: Language and Cognition, 2, 127145.
Birdsong, D. (2005). Interpreting age effects in second language acquisition. In Kroll, J. F. & De Groot, A. M. B. (Eds.), Handbook of bilingualism: Psycholinguistic approaches (pp. 109127). New York, NY: Oxford University Press.
Birdsong, D. (2006). Age and second language acquisition and processing: A selective overview. Language Learning, 56, 949.
Birdsong, D., & Molis, M. (2001). On the evidence for maturational constraints in second language acquisition. Journal of Memory and Language, 44, 235249.
Boersma, P., & Weenink, D. (2012). Praat: Doing phonetics by computer (Version 5.3.14) [Computer software]. Retrieved from
Bosker, H. R., Pinget, A.-F., Quené, H., Sanders, T., & De Jong, N. H. (2013). What makes speech sound fluent? The contributions of pauses, speed and repairs. Language Testing, 30, 159175.
Crossley, S. A., Salsbury, T., & McNamara, D. S. (2014). Assessing lexical proficiency using analytic ratings: A case for collocation accuracy. Applied Linguistics. Advance online publication. doi:10.1093/applin/amt056
Crowther, D., Trofimovich, P., Isaacs, T., & Saito, K. (2015). Does task affect second language comprehensibility? Modern Language Journal, 99, 8095.
De Jong, N. H., Steinel, M. P., Florijn, A. F., Schoonen, R., & Hulstijn, J. H. (2012). Facets of speaking proficiency. Studies in Second Language Acquisition, 34, 534.
DeKeyser, R. M. (2000). The robustness of critical period effects in second language acquisition. Studies in Second Language Acquisition, 22, 499533.
DeKeyser, R., Alfi-Shabta, I., & Ravid, D. (2010). Cross-linguistic evidence for the nature of age effects in second language acquisition. Applied Psycholinguistics, 31, 413438.
DeKeyser, R., & Larson-Hall, J. (2005). What does the critical period really mean? In Kroll, J. F. & De Groot, A. M. B. (Eds.), Handbook of bilingualism: Psycholinguistic approaches (pp. 88108). New York, NY: Oxford University Press.
Derwing, T., & Munro, M. (1997). Accent, intelligibility, and comprehensibility. Studies in Second Language Acquisition, 12, 116.
Derwing, T. M., & Munro, M. J. (2009). Putting accent in its place: Rethinking obstacles to communication. Language Teaching, 42, 476490.
Derwing, T. M., & Munro, M. J. (2013). The development of L2 oral language skills in two L1 groups: A seven-year study. Language Learning, 63, 163185.
Derwing, T. M., Rossiter, M. J., Munro, M. J., & Thomson, R. I. (2004). L2 fluency: Judgments on different tasks. Language Learning, 54, 655679.
Dörnyei, Z., & Kubanyiova, M. (2014). Motivating learners, motivating teachers: Building vision in the language classroom. Cambridge, UK: Cambridge University Press.
Ellis, R. (2005). Measuring implicit and explicit knowledge of a second language: A psychometric study. Studies in Second Language Acquisition, 27, 141172.
Flege, J. (2003). Assessing constraints on second-language segmental production and perception. In Meyer, A. & Schiller, N. (Eds.), Phonetics and phonology in language comprehension and production: Differences and similarities (pp. 319355). Berlin, Germany: Mouton de Gruyter.
Flege, J. E. (2009). Give input a chance! In Piske, T. & Young-Scholten, M. (Eds.), Input matters in SLA (pp. 175190). Clevedon, UK: Multilingual Matters.
Flege, J., Birdsong, D., Bialystok, E., Mack, M., Sung, H., & Tsukada, K. (2006). Degree of foreign accent in English sentences produced by Korean children and adults. Journal of Phonetics, 34, 153175.
Flege, J., Bohn, O.-S., & Jang, S. (1997). The effect of experience on nonnative subjects’ production and perception of English vowels. Journal of Phonetics, 25, 437470.
Flege, J., & Fletcher, K. (1992). Talker and listener effects on the perception of degree of foreign accent. Journal of the Acoustical Society of America, 91, 370389.
Flege, J., & Liu, S. (2001). The effect of experience on adults’ acquisition of a second language. Studies in Second Language Acquisition, 23, 527552.
Flege, J., Munro, M, & Fox, A. (1994). Auditory and categorical effects on cross-language vowel perception. Journal of the Acoustical Society of America, 95, 36233641.
Flege, J., Munro, M, & MacKay, I. R. A. (1995). Factors affecting degree of perceived foreign accent in a second language. Journal of the Acoustical Society of America, 97, 31253134.
Flege, J., Yeni-Komshian, G., & Liu, S. (1999). Age constraints on second language acquisition. Journal of Memory & Language, 41, 78104.
Gatbonton, E., Trofimovich, P., & Segalowitz, N. (2011). Ethnic group affiliation and patterns of development of a phonological variable. Modern Language Journal, 95, 188204.
Graesser, A. C., McNamara, D. S., Louwerse, M. M., & Cai, Z. (2004). Coh-Metrix: Analysis of text on cohesion and language. Behavioral Research Methods, Instruments, and Computers, 36, 193202.
Granena, G., & Long, M. H. (2013). Age of onset, length of residence, language aptitude, and ultimate L2 attainment in three linguistic domains. Second Language Research, 29, 311343.
Hakuta, K., Bialystok, E., & Wiley, E. (2003). Critical evidence: A test of the critical-period hypothesis for second-language acquisition. Psychological Science, 14, 3138.
Hellman, A. B. (2011). Vocabulary size and depth of word knowledge in adult-onset second language acquisition. International Journal of Applied Linguistics, 21, 162182.
Hopp, H., & Schmid, M. (2013). Perceived foreign accent in first language attrition and second language acquisition: The impact of age of acquisition and bilingualism. Applied Psycholinguistics, 34, 361394.
Hulstijn, J. H., Schoonen, R., De Jong, N. H., Steinel, M. P., & Florijn, A. (2012). Linguistic competences of learners of Dutch as a second language at the B1 and B2 levels of speaking proficiency of the Common European Framework of Reference for Languages (CEFR). Language Testing, 29, 203221.
Isaacs, T., & Thomson, R. I. (2013). Rater experience, rating scale length, and judgments of L2 pronunciation: Revisiting research conventions. Language Assessment Quarterly, 10, 135159.
Isaacs, T., & Trofimovich, P. (2012). Deconstructing comprehensibility: Identifying the linguistic influences on listeners’ L2 comprehensibility ratings. Studies in Second Language Acquisition, 34, 475505.
Jia, G., & Aaronson, D. (2003). A longitudinal study of Chinese children and adolescents learning English in the United States. Applied Psycholinguistics, 24, 131161.
Jiang, N. (2007). Selective integration of linguistic knowledge in adult second language acquisition. Language Learning, 57, 133.
Johnson, J., & Newport, E (1989). Critical period effects in second language learning: The influence of maturational state on the acquisition of ESL. Cognitive Psychology, 21, 6099.
Koizumi, R., & In’nami, Y. (2012). Effects of text length on lexical diversity measures: Using short texts with less than 200 tokens. System, 40, 554564.
Larson-Hall, J. (2006). What does more time buy you? Another look at the effects of long-term residence on production accuracy of English /r/ and /l/ by Japanese speakers. Language and Speech, 49, 521548.
Larson-Hall, J. (2010). A guide to doing statistics in second language research using SPSS. New York, NY: Routledge.
Lu, X. (2012). The relationship of lexical richness to the quality of ESL learners’ oral narratives. Modern Language Review, 96, 190208.
Major, R. (2008). Transfer in second language phonology: A review. In Hansen Edwards, J. & Zampini, M. (Eds.), Phonology and second language acquisition (pp. 6394). Amsterdam, the Netherlands: Benjamins.
MATLAB (Version 8.1) [Computer software]. Natick, MA: The MathWorks Inc.
Meara, P. (2005). LLAMA Language Aptitude Tests. Swansea, UK: Lognostics.
Muñoz, C. (2008). Symmetries and asymmetries of age effects in naturalistic and instructed L2 learning. Applied Linguistics, 24, 578596.
Munro, M., & Derwing, T. (1995). Foreign accent, comprehensibility, and intelligibility in the speech of second language learners. Language Learning, 45, 7397.
Munro, M., & Derwing, T. (2014, March). How different can you get? Ten-year learning trajectories for two L2 groups. Paper presented at the annual conference of the American Association for Applied Linguistics, Portland, OR.
Munro, M., & Mann, V. (2005). Age of immersion as a predictor of foreign accent. Applied Psycholinguistics, 26, 311341.
Paradis, M. (2009). Declarative and procedural determinants of second languages. Amsterdam, the Netherlands: Benjamins.
Patkowski, M. (1980). The sensitive period for the acquisition of syntax in a second language. Language Learning, 30, 449472.
Patkowski, M. (1990). Age and accent in a second language: A reply to James Emil Flege. Applied Linguistics, 11, 7389.
Pavlenko, A., & Blackledge, A. (Eds.). (2004). Negotiation of identities in multilingual contexts. Clevedon, UK: Multilingual Matters.
Piske, T., MacKay, I., & Flege, J. (2001). Factors affecting degree of foreign accents in an L2: A review. Journal of Phonetics, 29, 191215.
Pulvermüller, F., & Schumann, J. H. (1994). Neurobiological mechanisms of language acquisition. Language Learning, 44, 681734.
Saito, K. (2013). Age effects on late bilingualism: The production development of /r/ by high-proficiency Japanese learners of English. Journal of Memory and Language, 69, 546562.
Saito, K. (2014). Experienced teachers’ perspectives on priorities for improved intelligible pronunciation: The case of Japanese learners of English. International Journal of Applied Linguistics, 24, 250277.
Saito, K. (2015). Experience effects on the development of late second language learners’ oral proficiency. Language Learning. Advance online publication. doi: 10.1111/lang.12120
Saito, K., Trofimovich, P., & Isaacs, T. (2015). Second language speech production: Investigating linguistic correlates of comprehensibility and accentedness for learners at different ability levels. Applied Psycholinguistics. Advance online publication. doi:10.1017/S0142716414000502
Saito, K., Trofimovich, P., & Isaacs, T. (in press). Using listener judgements to investigate linguistic influences on L2 comprehensibility and accentedness: A validation and generalization study. Applied Linguistics.
Saito, K., Webb, S., Trofimovich, P., & Isaacs, T. (in press). Lexical profiles of comprehensible second language speech: The role of appropriateness, fluency, variation, sophistication, abstractness, and sense relations. Studies in Second Language Acquisition.
Scovel, T. (2000). A critical review of the critical period research. Annual Review of Applied Linguistics, 20, 213223.
Spada, N., & Tomita, Y. (2010). Interactions between type of instruction and type of language feature: A meta-analysis. Language Learning, 60, 263308.
Statistics Canada. (2008). 2006 Census of Canada topic based tabulations, ethnic origin and visible minorities tables: Ethnic origin, for population, for Canada, provinces and territories, 2006 census [Data set]. Retrieved from
Stevens, G. (2006). The age-length-onset problem in research on second language acquisition among immigrants. Language Learning, 56, 671692.
Trofimovich, P., & Baker, W. (2006). Learning second-language suprasegmentals: Effect of L2 experience on prosody and fluency characteristics of L2 speech. Studies in Second Language Acquisition, 28, 130.
Yao, Z., Saito, K., Trofimovich, P., & Isaacs, T. (2013). Z-Lab [Computer software]. Retrieved from
Yeni-Komshian, G. H., Flege, J. E., & Liu, S. (2000). Pronunciation proficiency in the first and second languages of Korean-English bilinguals. Bilingualism Language and Cognition, 3, 131149.
Yuan, F., & Ellis, R. (2003). The effects of pre-task planning and on-line planning on fluency, complexity and accuracy in L2 monologic oral production. Applied Linguistics, 24, 127.
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