Academic self-concept, a central psychological construct that powerfully explains learners' varied motivations and learning behaviors, needs to be further explored to deepen our understanding of language learner psychology. Drawing on self-reported learning histories, this study investigates the English self-concept of successful English as a…

The interactionist approach to second language acquisition has yielded a plethora of studies confirming the positive impact of interaction and corrective feedback on second language (L2) development. Nevertheless, only a few studies have attempted to investigate the development of L2 prosody using the interactionist approach. The current study…

Causal inference is a fundamental goal of many research endeavors, including scholarship in the field of language education and learning. Randomized controlled trials are considered an ideal design to test causal claims, but not all claims can be subjected to experimental treatment due to ethical and practical constraints. In this article, we…

This paper reports a bibliometric analysis of two small data sets: a set of 34 papers that make up "The Routledge handbook of vocabulary studies" (Webb, 2020) and a set of papers dealing with second language (L2) vocabulary research taken from a single journal "Frontiers in Psychology." Bibliometric maps based on author…

This study investigates the impact of positive psychology factors on English as a foreign language (EFL) learners' second language (L2) speaking proficiency. Specifically, it examines the predictive roles of foreign language speaking enjoyment, the ideal L2 speaking self, and L2 speaking grit on L2 speaking proficiency. Data were collected from…

Recent studies have shown that the frequency effect, although long used as a guide to word difficulty, fails to explain all variance in learner word knowledge. As such, a "more than frequency" conclusion has been offered to explain how lexical sophistication accounts for word difficulty. This study presents a multiple regression model of…

The contributions of positive psychology (PP) to the study of second and foreign language (L2) emotions have received considerable scholarly attention in recent years. In response to the criticism that it adopted a limited viewpoint, PP has broadened its perspective. Existential positive psychology (EPP) is a branch of PP that can address prior…

This study examined the relationship between complexity, accuracy and fluency (CAF), using longitudinal data. Conducted from the perspective of complex dynamic systems theory (CDST), this research adopted four CAF general measures to track the development of five Chinese undergraduates' English speech over a 15-week period. LOWESS graphs supported…

The belief that abilities can be cultivated, commonly referred to as a growth mindset, plays an important role in learners' motivation and persistence in their educational journey, including learning a new language. Recent research suggests that having a growth mindset alone is insufficient for educational success. Rather, the "seed" of…

Drawing on theories of interpersonal emotion transfer (Parkinson, 2020) and the control-value theory of achievement emotions (Pekrun, 2006), the present research employed a mixed-methods approach to examine how emotions are transmitted among peers in foreign language (FL) classrooms. We collected quantitative data from 308 freshmen using…

Nowadays, research in second language acquisition (SLA) is becoming increasingly interdisciplinary while many technical frontiers and research hotspots have emerged. Many studies focus on interdisciplinary topics, but few in-depth studies have been conducted on interdisciplinarity. This study examined the interdisciplinarity of SLA and the…

Executive functions (EF) have long been recognized as critical factors in accounting for individual differences in literacy development. However, their role in second language (L2) learning, particularly in non-alphabetic languages such as Chinese, has not been fully explored. This study endeavored to examine the role of EF in word reading among…

In this single-case study with a quasi-experimental design, we set out to examine the role of two input-based features of the language learning app Duolingo on learners' development of implicit and explicit second language (L2) knowledge. We investigated the effect of Duolingo's Stories feature and Podcast feature on two Spanish-L2 learners'…

An expanding literature has explored the impact of second language (L2) self-concept on language achievement and motivation. This review adopts a psychological lens to examine L2 self-concept, beginning with an outline of prominent theoretical frameworks: situated expectancy-value theory; Shavelson et al.'s (1976) hierarchical, multidimensional…

In this article, we highlight the important achievements of the editors and contributors in this special issue. We argue that this collection of studies on individual differences (IDs) advances the field in terms of theoretical diversification, methodological improvement, and pedagogical innovation. We also contend that a renewed interest in ID…