This dissertation is a quantitative analysis of language proficiencies through the lens of the dynamic model of multilingualism, using survival analysis to evaluate time until thresholds of foreign language proficiency are reached and nonparametric tests (Wilcoxon signed rank and Kruskal-Wallis) to compare proficiencies at distinct time intervals…

Mastering the phonological aspects of a second language (L2) poses significant challenges for adult learners, often affecting their intelligibility in acquiring that language (Derwing, Munro, & Wiebe, 1998). McAllister (1997) has highlighted L2 learners' struggles in perceiving and producing novel segmental features, which is corroborated by…

This study investigates the neurocognitive underpinnings of early language learning in adults and examines the modulating effects of individual differences in prior bilingual experience and cognitive capabilities. This study used a pre/post short-term longitudinal design with a 10-day Dutch language training via Rosetta Stone. Event-Related…

In the face of colonial efforts to extinguish Indigenous language and culture, Kanien'keha:ka (Mohawk people) have been working to revitalize Kanien'keha (the Mohawk language) since the 1970s. However, Kanien'keha continues to experience greater speaker loss than gain. Through a comprehensive vitality assessment, this dissertation examines the…

The United States government is perennially in need of employees with proficiency in critical foreign languages to communicate with foreign counterparts and maintain relationships worldwide. In order to fulfill this need, the government devotes significant resources training federal employees to advanced levels of language proficiency through…

Adult learners of a new language (L2) tend not to achieve target-like knowledge and performance, so the cognitive status of L2s has long been debated. While monolingual native (L1) speakers robustly apply their grammatical knowledge to input as it unfolds, there are competing claims about whether L2 speakers also do so reflexively (Dekydtspotter,…

Dynamic visuospatial support (DVS) is an effective tool for helping people learn linguistic tones (Hannah et al., 2017, Morett et al., 2022, Zhen et al., 2019), and learn words with these tonal categories (Baills et al., 2019, Morett et al., 2015). Progress in the field of embodied cognition and learning has led to recent emphasis on the pitch…

This case study explored Spanish-speaking educators' perceptions and experiences of dual-language immersion (DLI) professional learning (PL). The study aimed to understand how PL offerings could best support and meet the needs of DLI Spanish teachers' best practices in the target language. The perceptions and experiences of seven Spanish DLI…

For many people, learning a second language as an adult is a challenging endeavor. Much interest in the study of adult second language learning has concerned the type of input that learners receive in their second language, with findings suggesting that second language learners are often exposed to a register of speech called 'foreigner talk' that…

This study explores the conceptual system of adult Korean learners of English with three different levels of exposure to a second language (L2) cultural background. Assuming that different exposure to an L2 socio-cultural backgrounds plays a significant role in modifying a learner's conceptual system that operates both an L1 as well as an L2…

Adult second-language learners are a growing population of students in many countries throughout the world as the global community continues to expand beyond not only physical borders, but cultural and language borders as well. 200 expatriates, who lived in Denmark during the time span of 2006-2016, who were required to show proficiency in their…

In the 21st century, digital technology skills are necessary to succeed in technology-rich environments such as the school, the workplace, and daily life activities such as shopping online, applying for jobs, working online, and receiving education. This qualitative case the study provided insights into digital literacy and the most influential…

This study draws on user-driven, design-based collaborative research with participants to research, create, deploy, and measure user-experiences with a mobile App-delivered English for Occupational Purposes (EOP) training prototype that supports workplace adult second language (L2) language learners in three phases. Phase I consisted of a needs…

Skill acquisition theorists conceptualize second language (L2) learning as the acquisition of a set of perceptual, cognitive, and motor skills. The dominant view in skill acquisition theory is to regard L2 skill acquisition as a three-stage process "from initial representation of knowledge through initial changes in behavior to eventual…

Research on advanced L2 adult learners and viable classroom instruction for them has become increasingly important along with increasing global connections. This study investigated the effects of different kinds of spoken input modification on listening comprehension and incidental vocabulary learning by 106 advanced Chinese speakers of Japanese…