Eun-jin Oh

Previous studies on the effects of speaking rate on voice onset time (VOT) of stops in English, French, Icelandic, and Thai indicate that speaking rate asymmetrically affects VOT values. That is, pre-voiced and long-lag stops vary due to the rate factor more than short-lag stops do. One suggested explanation for this asymmetry is that it is due to the necessity of maintaining phonetic contrasts among the stop categories. Since pre-voiced and long-lag stops represent the ends of the VOT scale, th

This study investigates formant transition shapes of Korean front vowels produced by native speakers of Seoul Korean. Sixteen speakers (eight male and eight female speakers) produced [pVt] syllables where the vowels were [i, e, ɛ]. F1, F2, and F3 transition shapes were estimated by presenting formant values at 11 points by dividing the vowel duration into 10different time intervals. The results indicated that the male and female speakers overall demonstrated similar formant transition shapes and

This study explores whether there is a gender difference in vowel space size and vowel changes in Korean. Nine male and nine female speakers of Seoul Korean read [CVt](C = [p, t], V = [i, e, ɛ, ɯ, ʌ, a, u, o]) in a carrier sentence. Female speakers demonstrated larger vowel spaces than male speakers as measured on the Hertz, Bark, and normalized Bark scales. Both male and female speakers displayed an overall raising of vowels compared to Yang (1996). The gender difference in F1 values was larger

Korean Journal of English Language and Linguistics 8-1, 75-92. It has been assumed that the systematic variation of VOT values due to different stop places in articulation follows an automatic mechanism. This study aims to test that assumption and see what effect variations in an individual's experience in a foreign language have in this regard. Results, based on the percentage of VOT by stop places and their grand means, indicated that experienced learners produced more native-like values while

This study investigated how Korean-English bilingual speakers and Korean late learners of English realize dynamic patterns of front monophthong vowels in American English. Twenty subjects read monosyllabic [CVC] words containing the vowels [i, ɪ, ɛ, æ] in a carrier sentence. F1, F2, and F3 frequency values were measured at 11 points for each speaker by dividing their vowel duration into ten equal segments. The results indicated that, compared to Korean late learners of English (Group NK), the Ko

The main aim of this study was to investigate how high vowel systems are organized in early bilingual speakers of Korean and English, and late learners of English. The early bilinguals, who had been exposed to both languages from an early age, attained values more native-like for both Korean and English vowels than the late learners did, but it was not the case that they produced all the vowel categories with respective native values. For example, the F2 values of the bilinguals' /u/ were differ

It is a well-known phenomenon that vowel duration in English is generally longer before a voiced stop than a voiceless one. Past research has postulated that the closure duration of the voiceless stop is generally longer than that of the voiced stop and that the duration of a preceding vowel is determined complementarily by the closure duration of the stop. To shed further light on the phenomenon, this study examined fourteen native speakers of American English who read the monosyllabic words [b

Oh, Eunjin. 2011. The Mid and Low Vowel Systems of Korean-English Bilingual Speakers. Korean Journal of Linguistics, 36-3, 635-657. This study investigates the structure of the mid and low vowel systems of bilingual speakers of Korean and English, and considers how some current theories of phonetics learning would model their bilingual vowel system. Nine native speakers of Seoul Korean, nine native speakers of American English, and seven early bilingual speakers of Korean and English participate

V-to-C Coarticulation Effects in Non-native Speakers of English and Russian: A Locus-equation AnalysisEunjin OhLocus equation scatterplots for [bilabial stop + vowel] syllables were obtained from 16 non-native speakers of English and Russian. The results indicated that both Russian speakers of English and English speakers of Russian exhibited modifications towards respective L2 norms in slopes and y-intercepts. All non-native locus equations generated exhibited linearity. Accordingly, the basic

Oh, Eunjin. 2010. The Coronal Stop Places of Early Korean-English Bilingual Speakers. Korean Journal of linguistics, 35-1, 155-181. The coronal stops of Korean and English differ subtly in places of articulation; denti-alveolar in Korean and alveolar in English. This study investigated how the coronal stop places are structured in early bilingual speakers of Korean and English. The main question was whether early bilinguals maintain one place or two independent places for the coronal stops. Nine

This study explores the dynamic formant transitions of the American English vowels [eɪ] and [oʊ] produced by native American English speakers (Group E), Korean-English bilingual speakers (Group KE), and Korean learners of English (Group K). The speakers read “bait [beɪt]” and “boat [boʊt]” within a carrier sentence. The average distance of the formant movements was similar between Groups E and KE, but overall longer for Group K than E. The measurement point showing the minimum F2 value for [oʊ]

This study aimed to examine how Korean-English bilinguals make use of VOT and F0 cues in perception and production of Korean (lenis vs. aspirated) and English (voiced vs. voiceless) stops. It was explored whether bilinguals with extensive experience living in the U.S. exhibit native-like or interactive patterns in the cue use for both languages. Participants produced monosyllabic word-initial stops within a carrier sentence in each language, and performed forced-choice identification tasks with

This study aimed to test ChatGPT’s ability to answer linguistics (phonology) exam questions by comparing its responses to those of two graduate students in linguistics. GPT-3.5 and GPT-4 versions were employed. ChatGPT performed similarly to students on true-false and multiple-choice questions but scored higher on conceptual questions. Although ChatGPT explained phonological concepts well, it performed poorly in problem-solving questions requiring inference using such concepts. In particular, Ch

The aim of this study is to test the Pre-voiceless Hyperarticulation Hypothesis of Thomas (2000) and Moreton (2004) for American English vowels [i, ɪ, eɪ, oʊ, aɪ, ɔɪ, aʊ]. Native and Korean-English bilingual speakers participated in a production experiment and read minimal pairs in the forms of “[bVd] - [bVt]” in a carrier sentence. As for the native speakers, the high front vowel [i] did not display significant peripheralization, and the lax [ɪ] tended to be centralized in the vowel space. Beca

Oh, Eunjin. 2010. Speaker Gender and the Degree of Coarticulation. Korean Journal of Linguistics, 35-3, 743-766. Gender differences have been reported in many acoustic measures. This study investigated whether degrees of coarticulation vary as a function of speaker gender. Seven male and seven female native speakers of American English participated in the experiment. The degrees of vowel-to-vowel and consonant-to-vowel coarticulation were calculated by taking differences between estimated vowel