Grammatical complexity has been established as a key indicator of language and writing development (Ortega 2003; Bulté and Housen, 2014; Crossley and McNamara 2014). The present study uses the Register-Functional approach to complexity (Biber et al. 2022) to compare the development of L1 English and L2 English writers across year of study and…

Conversely to plenty of studies describing how L1 transfer affects L2 systems, where the two grammars, L1/L2, often only come to interact later in life, less is known of dominant language transfer in heritage language grammars. Unlike in L2 speakers, the dominant language of the heritage speaker potentially affects its weaker language already from…

This study reports a meta-analysis that synthesizes the empirical research on the role of language aptitude in second language grammar acquisition. A total of 33 study reports were identified including 17 predictive studies that investigated the correlations between aptitude and ultimate L2 attainment and 16 interactional studies that examined the…

This paper investigates whether any difference exists in the degree of second language attrition between two siblings in terms of grammatical complexity, grammatical accuracy, lexical complexity, and lexical productivity based on their storytelling data collected over the period of 31 months. The subjects' L1 and L2 are Japanese and English,…