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Abstract
The present study quantified the amount of accent in English vowels produced by native adult Turkish speakers. Vowels that are present in both Turkish and English (close vowels) were compared with those that are present only in English (distant vowels). The first two formant frequencies (F1 and F2) were obtained from the 11 English monophthong vowels (/i, i, e, ε, æ, Λ, u, 
, o, 
, 
/) produced by 20 Turkish-accented English (TE) (10 males and 10 females) bilinguals and 20 native American English (AE) speakers. Euclidean distance (ED) was used to measure the separation between the corresponding TE and AE vowels. Perceptual experiment was also carried out to assess the amount of accent in the English produced by Turkish speakers as perceived by native monolingual English speakers. F1 and F2 values revealed that TE speakers generally were able to produce close and distant vowels comparably, with considerable amount of deviation from AE speakers. ED values for close and distant vowels were not significantly different. The amount of perceived accent indicated the precision of vowel production and was found to directly correlate with the acoustic findings.