Janet S. Oh

Overhearing a Language During Childhood

Despite its significance for understanding of language acquisition, the role of childhood language experience has been examined only in linguistic deprivation studies focusing on what cannot be learned readily beyond childhood. This study focused instead on long-term effects of what can be learned best during childhood. Our findings revealed that adults learning a language speak with a more nativelike accent if they overheard the language regularly during childhood than if they did not. These findings have important implications for understanding of language-learning mechanisms and heritage-language acquisition.

Early childhood language memory in the speech perception of international adoptees

It is as yet unclear whether the benefits of early linguistic experiences can be maintained without at least some minimal continued exposure to the language. This study compared 12 adults adopted from Korea to the US as young children (all but one prior to age one year) to 13 participants who had no prior exposure to Korean to examine whether relearning can aid in accessing early childhood language memory. All 25 participants were recruited and tested during the second week of first-semester college Korean language classes. They completed a language background questionnaire and interview, a childhood slang task and a Korean phoneme identification task. Results revealed an advantage for adoptee participants in identifying some Korean phonemes, suggesting that some components of early childhood language memory can remain intact despite many years of disuse, and that relearning a language can help in accessing such a memory.

Phoneme discrimination of an unrelated language: Evidence for a narrow transfer but not a broad-based bilingual advantage

This study examines monolingual and multilingual individuals’ discrimination of stop consonants in a language to which they had never been exposed: Korean. If bilingualism leads to increased flexibility in phonological categorization, we may see a broad-based bilingual advantage for phoneme discrimination. Using a Korean phoneme discrimination task, we compared 56 adults in four groups: monolingual English, bilingual Spanish, bilingual Armenian, and trilingual. Findings indicate that Spanish–English bilingual individuals scored no better than English monolinguals, and lower than Armenian–English bilingual individuals. In this case, the advantage from early childhood non-English exposure or current bilingualism was found to be specific only to languages with similar phonemic categories. This supports a narrow first/second language to third language transfer view of phoneme discrimination skills.

Examining the oral language competency of children from Korean immigrant families in English-only and dual language immersion schools

In this study, we examined the bilingual language development among Korean American first-graders in two southern California cities and explored the opportunities for language use available to them in various spaces: at school (one dual language immersion school and one traditional English-only public school), at home, and in the community. Data collected over 15 months included three oral language proficiency assessments in Korean and English; interviews with parents and children; and fieldnotes based on observations at home, at school, and during extracurricular activities. All of the children, regardless of school setting, showed increases in English proficiency; however, their Korean development varied. We found that English opportunities were widely accessible for all of the participants; however, opportunities to use Korean were starkly different between the two cities. The families who resided in communities with few Korean resources needed more financial and temporal resources to attain regular exposure to Korean, which suggests that supporting the development of a less-commonly spoken heritage language in the United States (e.g. Korean) may not be accessible to all immigrant families. Finally, we found that for children in the developmental stages of bilingualism, purposeful and deliberate instruction (particularly in vocabulary and grammar) and diverse opportunities to practice both languages are continuously needed.

Does early speaking experience in Korean help adult relearners

Research indicates that early linguistic input is crucial for acquiring native‐like phonology and morphosyntax. This study investigates whether early discontinued linguistic experience helps adult relearners master the phonology of a language. Students from first‐year Korean classes were classified into three groups: no/minimal speaking experience, childhood speaking experience (until about age 5), and native speakers. Native speakers not enrolled in Korean classes also participated. Participants produced sentences that included words utilizing the three‐way contrast in Korean stop consonants (lenis, tense, and aspirated). Measurements of stop closure duration indicate that only the two native speaker groups were differentially producing lenis and tense consonants. Measurements of VOT indicate that only the childhood and the native speaker groups were differentially producing the three consonants. Furthermore, the childhood speakers’ general pattern of closure duration and VOT for the three consonants was...