The well-known sampling limitation of most longitudinal corpus data can be even more consequential in the study of morphosyntactic variation in child language. An analysis of caregiver input suggests that variable use in overlapping contexts may be hard to find by solely relying on corpus data collected under the sampling procedures that are…

This book gives an overview of the linguistic development of Korean-English bilingual children living in the US. It provides a detailed longitudinal account of English and Korean acquisition in early childhood, offering a close examination of Korean-American children's code-switching and morphology and syntax development during a time when their…

This study investigates the longitudinal development of language attitudes towards Catalan and Spanish over a five-year period in the transition from primary to secondary education of a sample of students (N = 1,143) in Catalonia and Aragon. Two research questions were investigated: (1) How do language attitudes develop over time? and (2) How do…

This study longitudinally examined the effects of cognitive and sociopsychological individual differences (aptitude, motivation, personality) and the quantity and quality of second language (L2) experience on L2 speech gains in naturalistic settings. We elicited L2 spontaneous speech from 50 Chinese learners of English at the beginning and the end…

This true longitudinal study explored the lexical development of L2 university English major students in Thailand using two learner corpora. This study analyzed the natural learners' English language writing assignments from two writing courses and tracked their lexical development over a relatively long period (three years with five batches of…

This longitudinal inductive research unpacks the process of African post-secondary students' Chinese language identity (CLI) with the purpose of exploring a model of CLI development. We traced how 12 multilingual African students developed their CLI during the first year in a Chinese university. Data coded from three rounds of interviews conducted…

Research has indicated that lexical richness is an important indicator of second language (L2) proficiency. However, most research has examined written, cross-sectional English L2 corpora and does not necessarily indicate how spoken lexical use develops over time or whether observed trends are stable across L2s. This study adds to previous…

The purpose of this qualitative research study is to portray the complex language practices of multilingual children when learning mathematics. To do so, I draw on data collected as part of a three-year research study that was designed to understand the relationship between young children's language use and mathematics learning, focusing on…

This longitudinal case study investigated the developmental trajectories of two participants enrolled in an ITA oral communication course at Purdue University. The course provides language support to the ITA population who play a crucial role in higher education programs in the U.S. (Gorsuch, 2016). Over four months (i.e., one semester), I…

This study examined the role of parents' early home language use in the English reading development of emergent bilinguals (N = 3,058) and how their relations are moderated by children's oral English language proficiency using longitudinal data from kindergarten to eighth grade (ages 6-15 years). Results from multi-group latent basis growth models…

Research on "parentese," the acoustically exaggerated, slower, and higher-pitched speech directed toward infants, has mostly focused on maternal contributions, although it has long been known that fathers also produce parentese. Given recent societal changes in family dynamics, it is necessary to revise these mother-centered models of…

The Welsh Government's Welsh language strategy, Cymraeg: A million Welsh speakers [Welsh Government. 2017a. "Cymraeg 2050: A Million Welsh Speakers." Cardiff: Welsh Government], aims to increase the numbers of Welsh speakers to one million by 2050. The creation of new Welsh speakers and immersion education form an integral part of the…

This longitudinal case study describes a male Korean English teacher's identity development during two years of compulsory military service. An "investment and imagined communities" framework undergirded the thematic analysis of emails, mobile messaging, and casual conversations. Three recursive themes emerged: English user, researcher,…

This study investigated lexical complexity in English language teaching (ELT) students' essays across genres and over the course of time. The essays included descriptive, compare and contrast, advantage and disadvantage, and argumentative genres. Employing a longitudinal, quasi-experimental and repeated measures design in a year-long writing…

One of the products of globalization in sociolinguistics is the emergence of transnational regimes in language policy, in which power is exercised across boundaries of traditional nation states. This paper engages with audit culture, a transnational policy mechanism which involves the continuous evaluation of nation states' performance through the…