Second-Language Acquisition and First-Language Attrition of Speech: The Production of Arabic and English Short Vowels

This study investigates if two groups of experienced late bilinguals (Arabic-English, English-Arabic) produce the Arabic vowels /ɪ, u, a/ and the English vowels /ɪ, ʊ, æ/ with nativelike formant values (F1, F2) compared with Arabic and English monolinguals, respectively. We aimed to characterize the relationship between second-language (L2) acquisition and first-language (L1) attrition of vowels, that is, does nativelike acquisition of an L2 vowel correspond to attrition of a phonetically similar L1 vowel, and vice versa? Moreover, we explored if nativelikeness of bilingual vowel productions is influenced by the predictor variable sound discrimination aptitude. Results show that bilinguals who produce nativelike L2 vowels are also able to maintain native L1 productions, suggesting that an increased L2 proficiency does not inevitably entail a decline in L1 proficiency.