One of the fundamental questions in the field of language acquisition is a learnability problem, which considers how learners acquire certain aspects of language which are not directly provided in the input or whose referents are not readily observable. This dissertation investigates Japanese children's acquisition of various linguistic phenomena,…

Co-speech gesture in monolinguals has been linked to several cognitive processes: prompting memory stores, conveying spatial concepts, searching for lexical equivalents, and supporting rhythm and cohesion. The production of co-speech gesture also occurs in spoken language bilinguals. Studies have demonstrated that bilinguals fluent in American…

We are currently experiencing unprecedented waves of forced migration (UNHCR, 2022a), leading to an increase in anti-refugee rhetorics which in turn fuel policies that have life or death consequences for refugees (Gotlib, 2017). In this context, refugee voices are urgently needed in scholarly, public, and political realms, yet these perspectives…

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…

This dissertation investigates the interaction of developing extralinguistic cognitive systems with early language learning and processing through the case study of verb argument structure. The interaction of these systems with the linguistic system underpins fundamental theories of language learning and use: language does not exist in isolation.…

Many Hispanic adult immigrants to the United States acquire sufficient English skills to enable them to function in daily life but are left feeling that their skills are inadequate for college work. The problem addressed by the study is that the factors that are predictive of successful acquisition of college-level English skills had not been…

A considerable amount of research has emerged in recent years concerning second language (L2) learner sensitivity to various information types. From this, Clahsen and Felser proposed the Shallow Structure Hypothesis (SSH) to account for increased learner sensitivity to certain kinds of non-structural (e.g., contextual, discoursal, semantic, and…

Segmentation is a cornerstone of language processing across levels of linguistic analysis, and yet, standard models of linguistic memory leave the role of higher-order segments in online comprehension understudied. This dissertation advances the Context-Sensitive Encoding (CSE) hypothesis: that implicit prosodic boundaries (Bader, 1998; J. Fodor,…

This study investigates the effects of four online vocabulary tasks on second language (L2) vocabulary acquisition among learners of different proficiency levels. While tasks are widely used to support L2 vocabulary learning, the efficacy of a task depends on the interplay between task and learner factors. Thus, choosing an appropriate task…

Cognitive flexibility (switching) and control (inhibition) are among widely accepted cognitive advantages of bilingualism. Switch Cost (SC), i.e., the time difference to complete a switch versus non-switch task, is a construct for measuring the switching ability. The need to control the interference and switching between one's languages leads to…

Researchers have investigated the promise of unimodal and bimodal input in enhancing vocabulary learning from meaning-focused activities. Compared to unimodal input, the simultaneous presentation of written and aural input in bimodal input has been argued to direct L2 learners' attention to words and enhance the form-meaning links for new…

Registers are culturally recognized varieties of language that are associated with situations of use (Biber, Egbert, & Keller, 2020). Variation in frequencies of linguistic forms across registers is thought to be functional for the situations they are associated with; that is, certain language features are more common in one register than…

This study examines the impact of gamification elements, in particular leaderboards, badges, and eBucks, on the cognitive engagement (CE), intrinsic motivation (IM), and self-efficacy (SE) of English Language Learners (ELLs) at a high school in the Southeastern United States. The investigation, conducted during optional weekly readings, utilizes a…

This dissertation investigates the interplay between the implicit knowledge that learners have of a nonnative language and their processing of that language, examining two types of relative clauses (RCs) in English: gapped RCs (e.g., "the man that they hired") and resumptive RCs (e.g., *"the man that they hired him").…

Early childhood language experiences influence how a child's mind and brain process language and acquire literacy. For children growing up bilingual, their two languages interact in their minds, and these cross-linguistic influences can lead to unique neurocognitive mechanisms for language and reading compared to monolinguals. In this…