Linguistic influences on comprehensibility and accentedness in second language Korean speech

A considerable body of research has investigated the influence of linguistic variables on comprehensibility and accentedness in L2 speech. However, studies on this topic have overwhelmingly focused on L2 English, with little known about other L2s. This study investigated linguistic influences on accentedness and comprehensibility in L2 Korean. Participants included 198 L2 Korean speakers of varying proficiency levels and L1 and 82 L1 Korean listeners from South Korea. The speakers completed a monologic speaking task and their speech samples were coded for phonological, lexical, grammatical, and fluency variables. Listener ratings indicated speakers were perceived as more comprehensible than they were nativelike, but the correlation between the two was extremely strong (r = 0.90). Regression models using linguistic variables to predict comprehensibility and accentedness yielded R² values of 0.71 and 0.65, respectively. Most linguistic variables had similar influences on comprehensibility and accentedness, with some notable exceptions: intonational phrasing errors and lexical diversity predicted comprehensibility, but not accentedness.