This article presents a theoretical review of and methodological guidelines for the study of two key notions in second language acquisition research, complexity and difficulty. The term "complexity" has gained considerable currency over the past decades and has taken on a wide range of meanings. We argue for a more restricted…

The fluency task, which involves lexical retrieval from a categorical or thematic prompt, has been a crucial paradigm in studies about lexicon in bilingualism and additional languages. Particularly, there has been a very productive cognitive turn towards analytical models based on the exploration of the cognitive processes underlying the mental…

Eye tracking has taken hold in second language acquisition (SLA) and bilingualism as a valuable technique for researching cognitive processes, yet a comprehensive picture of reporting practices is still lacking. Our systematic review addressed this gap. We synthesized 145 empirical eye-tracking studies, coding for 58 reporting features and…

In this article we address two key questions in the application of dynamical systems theory (DST) to second language acquisition (SLA) that have not been resolved in recent debates about this issue. The first question relates to reductionism. Is an antireductionist position a necessary element of DST? We show that the radical antireductionist…

Recall deals with the encoding, storage, and retrieval of information. Bilinguals have greater flexibility for recall as the person will have multiple language choices to come out with the target word. In other words, a bilingual will have more lexical choices to retrieve the target word. The current study investigates cross-language recall…

Background: Student engagement has been conceptualised and operationalised in various learning environments. However, there is currently a lack of established scales to measure student engagement in synchronous online learning. One possible reason is the existence of the conceptual and structural ambiguity regarding student engagement. Objective:…

As educational technology advances, the role of artificial intelligence (AI) in enhancing language education becomes increasingly prominent. However, there is a scarcity of empirical research assessing how AI integration influences student engagement and contributes to the language learning performance. This mixed-methods study seeks to fill the…

Lexical coverage, i.e. the extent to which words in a text are known, is considered an important predictor of reading comprehension, with studies suggesting 98% lexical coverage leads to adequate comprehension. However, no studies to date have examined how the various lexical coverage percentages suggested in the literature are reflected by the…

This study investigates whether syntactic unification occurs during online L2 sentence comprehension using time-frequency analysis. We measured the oscillatory power changes in native English speakers and L1-Cantonese L2-English speakers while they were reading well-formed English sentences, syntactically intact nonsense sentences, and random word…

Our study examined the language learning strategies of successful and less successful Iranian EFL learners. The sample comprised 1608 junior and senior EFL students who completed the "Strategy Inventory for Language Learning" (SILL), and 30 randomly selected participants in semi-structured interviews. The results from descriptive…

This study examined the development of automaticity in processing L2 collocations, and the roles of L1 collocational knowledge and practice conditions in the development process. Korean learners of English were assigned to one of two practice conditions (practice in identical or varied contexts). The learning gains for word combinations with and…

Previous research showed that short-term second language training modulates children's brain responses to language processing. However, little is known about whether short-term training from language-immersion apps would have the same effect on young children's neural processing of a newly learnt language. We examined the auditory event-related…

Critical thinking (CT) is widely recognised as a core competency in 21st-century higher education, particularly within English as a Foreign Language (EFL) learning contexts. This study examines the extent to which motivation and engagement contribute to the development of CT skills among Chinese EFL university students. A sample of 626…

L2 learner engagement is an emerging but critical construct in the field of psychology of language learning and teaching. However, research on L2 learner engagement has suffered from the inconsistent operationalization of the multidimensional structure of the construct and the conceptual overlap among its different components, making research…

The affective turn in the second language (L2) acquisition literature has witnessed a shift from the periphery to a clear focus on emotions. Nevertheless, this shift tends to examine emotion separately from cognition. Vygotsky's "perezhivanie" provides a theoretical lens to explore the inextricable interconnectedness of emotion and…