This study observes whether Yemeni Arabic-English bilinguals demonstrate any phonetic interference in their vowel production by examining the acoustic similarities and differences of both of their languages. Besides, it compares Yemeni Arabic vowels of bilinguals to monolingual production to identify any L2 influence on L1. Sixty subjects speaking native Yemeni Arabic were involved. Thirty were bilinguals who have acquired English as an L2 and the remaining 30 were monolinguals. All subjects produced a list of Arabic words with the target vowels /iː, aː, uː/ in the word-medial position. Moreover, the bilingual subjects also produced a list of English words with the target vowels /iː, ɑː, uː/ in the word-medial position. Vowel Duration, First Formant (F1), Second Formant (F2), and Third Formant (F3) of the target vowels were acoustically analysed. Findings revealed that in the F2 of /aː/, Yemeni Arabic-English bilinguals demonstrate L2 influence on L1 in the form of L1 phonetic drift towards their L2. On the contrary, findings show no significant influence of L2 English on L1 Yemeni Arabic long vowels /iː/ and /uː/. However, findings reveal a slight drift in L1 Yemeni Arabic vowels towards L2 Yemeni English vowels causing closer acoustic vowel space between both languages suggesting an assimilatory process. Furthermore, Yemeni Arabic-English bilinguals formed new categories for their L2 Yemeni English vowels for the acoustic properties: vowel duration and F1 of /iː/, F2 of /ɑː/, as well as F1 and F2 of /uː/ whereas they developed merged categories for the remaining acoustic properties.

Keywords: Acoustic; Arabic-English Bilinguals; Formant Frequency; Vowel Duration; Yemeni Arabic

Abunima, S., Jaafar, S. R. S., & Hamid, S. A. (2021). The Influence of Bilingualism on the Production of Plosive Sounds in L1 (Arabic) and L2 (English): Acoustic Analysis of the Duration of Preceding and Following Vowels. Academic Journal of Modern Philology, 14, 25–44. https://doi.org/10.34616/ajmp.2021.14

AL Abdely, A. A., & Thai, Y. N. (2016). Learning English Vowels by Iraqi EFL Learners: Perceived Difficulty versus Actual Performance. 3L: The Southeast Asian Journal of English Language Studies –, 22(1), 1–18. https://doi.org/10.17576/3L-2016-2201-01

Aldubai, N. A. (2015). Sub-dialectal Coronal and Non-coronal Assimilation in Yemeni Arabic. International Journal of Applied Linguistics and English Literature, 4(5), 234–248. https://doi.org/10.7575/aiac.ijalel.v.4n.5p.234

Alghamdi, M. M. (1998). A Spectrographic Analysis of Arabic Vowels: A Cross-dialect Study. Journal of King Saud University, 10(1), 3–24.

Al-Hamzi, A. M. S., Al-Shrgabi, A. hakim A. S., Al-Haidari, A. S. A., Faraj, M. M. A., & Al-Housali, T. A. A. (2021). Pronunciation Errors of English Front Vowels by Yemeni EFL Learners. PAROLE: Journal of Linguistics and Education, 11(1), 41–56. https://doi.org/10.14710/parole.v11i1.41-56

Alotaibi, Y. A., & Husain, A. (2009). Formant-Based Analysis of Spoken Arabic Vowels. Proceedings BioID_MultiComm, LNCS 5707, 162–169. https://doi.org/10.1007/978-3-642-04391-8_21

Alqarni, H. (2018). The Production of English Vowels by Native Arabic Speakers. Colorado State University.

Alshamiri, S. F., Shahidi, A. H., & Jaafar, S. R. S. (2022). First-Language Phonetic Drift of Yemeni Arabic Stops. GEMA Online Journal of Language Studies, 22(4), 127–141. https://doi.org/10.17576/gema-2022-2204-08

Antoniou, M., Best, C. T., Tyler, M. D., & Kroos, C. (2011). Inter-language interference in VOT production by L2-dominant bilinguals: Asymmetries in phonetic code-switching. Journal of Phonetics, 39(4), 558–570. https://doi.org/10.1016/j.wocn.2011.03.001

Baker, W., & Trofimovich, P. (2005). Interaction of Native- and Second-Language Vowel System(s) in Early and Late Bilinguals. Language and Speech, 48(1), 1–27. https://doi.org/10.1177/00238309050480010101

Bello, H., Yap, N. T., Chan, M. Y., & Nimehchisalem, V. (2020). An Acoustic Analysis of English Vowels Produced by Nigerian and Malaysian ESL Speakers. Journal of Language and Communication, 7(1), 1–15. https://doi.org/10.24303/lakdoi.2015.23.1.65

Boersma, P., & Weenink, D. (2019). PRAAT: Doing Phonetics by Computer (Version 6.0.46). Computer Program. (6.0.46).

Bergmann, C., Nota, A., Sprenger, S. A., & Schmid, M. S. (2016). L2 immersion causes non-native-like L1 pronunciation in German attriters. Journal of Phonetics, 58, 71–86. https://doi.org/10.1016/j.wocn.2016.07.001

Chang, C. B. (2011). Systemic Drift of L1 Vowels in Novice L2 Learners. Proceedings of the International Congress of Phonetic Sciences, August, 428–431.

Dmitrieva, O., Jongman, A., & Sereno, J. (2010). Phonological neutralization by native and non-native speakers : The case of Russian final devoicing. Journal of Phonetics, 38(3), 483–492. https://doi.org/10.1016/j.wocn.2010.06.001

Fathi, H. M., & Qassim, Z. R. (2020). An Acoustic Study of the Production of Iraqi Arabic Vowels. Journal of Al-Frahedis Arts, 12(40), 692–705. https://doi.org/10.51990/2228-012-040-008

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). York Press.

Flege, J. E. (2007). Language contact in bilinguals. In J. Cole & J. I. Hualde (Eds.), Labratory phonology 9 (pp. 353–381). Mouton.

Flege, J. E., & Bohn, O.-S. (2021). The Revised Speech Learning Model (SLM-r) Applied. In Ratree Wayland (Ed.), Second Language Speech Learning: Theoretical and Empirical Progress (Issue May, pp. 3–83). Cambridge University Press. https://doi.org/10.1017/9781108886901.003

Fox, R. A., & Jacewicz, E. (2009). Cross-dialectal variation in formant dynamics of American English vowels. The Journal of the Acoustical Society of America, 126(5), 2603–2618. https://doi.org/10.1121/1.3212921

Guion, S. G. (2003). The Vowel Systems of Quichua-Spanish. Phonetica, 60, 98–128. https://doi.org/10.1159/000071449

Hawkins, S., & Midgley, J. (2005). Formant frequencies of RP monophthongs in four age groups of speakers. Journal of the International Phonetic Association, 35(2), 183–199. https://doi.org/10.1017/S0025100305002124

Kalaldeh, R. (2018). Acoustic analysis of Modern Standard Arabic vowels by Jordanian speakers. International Journal of Arabic-English Studies, 18, 23–48.

Kartushina, N., Hervais-Adelman, A., Frauenfelder, U. H., & Golestani, N. (2016). Mutual influences between native and non-native vowels in production: Evidence from short-term visual articulatory feedback training. Journal of Phonetics, 57, 21–39. https://doi.org/10.1016/j.wocn.2016.05.001

Koo, T. K., & Li, M. Y. (2016). A Guideline of Selecting and Reporting Intraclass Correlation Coefficients for Reliability Research. Journal of Chiropractic Medicine, 15(2), 155–163. https://doi.org/10.1016/j.jcm.2016.02.012

Kotby, M. N., Saleh, M., Hegazi, M., Gamal, N., Abdel Salam, M., Nabil, A., & Fahmi, S. (2011). The arabic vowels: Features and possible clinical application in communication disorders. Folia Phoniatrica et Logopaedica, 63(4), 171–177. https://doi.org/10.1159/000316323

MacLeod, A. A. N., Stoel-Gammon, C., & Wassink, A. B. (2009). Production of high vowels in Canadian English and Canadian French: A comparison of early bilingual and monolingual speakers. Journal of Phonetics, 37(4), 374–387. https://doi.org/10.1016/j.wocn.2009.07.001

Munro, M. J. (1993). Productions of English vowels by native speakers of Arabic: acoustic measurements and accentedness ratings. Language and Speech, 36(1), 39–66. https://doi.org/10.1177/002383099303600103

Natour, Y. S., Marie, B. S., Saleem, M. A., & Tadros, Y. K. (2011). Formant frequency characteristics in normal Arabic-speaking Jordanians. Journal of Voice, 25(2), e75–e84. https://doi.org/10.1016/j.jvoice.2010.10.018

Perwitasari, A., Klamer, M., & Schiller, N. O. (2016). Formant frequencies and vowel space area in Javanese and Sundanese English language learners. 3L: Language, Linguistics, Literature, 22(3), 141–152. https://doi.org/10.17576/3L-2016-2203-10

Ramadan, K., & Thai, Y. N. (2021). Production of English Vowel by Libyan EFL learners: Insights from Unnormalized and Normalized Data. International Journal of Academic Research in Business and Social Sciences, 11(7), 1586–1603. https://doi.org/10.6007/ijarbss/v11-i7/10377

Recasens, D. (1987). An acoustic analysis of V-to-C and V-to-V coarticulatory effects in Catalan and Spanish VCV sequences. Journal of Phonetics, 15(4), 299–312. https://doi.org/10.1016/s0095-4470(19)30580-7

Shahidi, A. H., & Aman, R. (2011). An acoustical study of English plosives in word initial position produced by Malays. 3L: Language, Linguistics, Literature, 17(2), 23–33.

Tsukada, K. (2009). An acoustic comparison of vowel length contrasts in standard Arabic, Japanese and Thai. 2009 International Conference on Asian Language Processing: Recent Advances in Asian Language Processing, IALP 2009, 19(4), 76–79. https://doi.org/10.1109/IALP.2009.25

Urazbaev, K., & Sukhrobbekov, S. (2021). Comparative study of voice onset time in English word-initial stop consonants produced by Uzbek and American speakers of English. 3L: Language, Linguistics, Literature, 27(3), 183–198. https://doi.org/10.17576/3L-2021-2703-12