This study reports on a bibliometric mapping analysis of L2 pronunciation research. Analyses on 629 articles published between 1977 and 2020 in 15 prestigious SSCI-indexed applied linguistics journals identified significant research themes and trends, influential authors, documents, and publication sources. The results of the analyses of citation impact, cocitation, and research trends provide valuable insights into understanding the dynamics, evolution patterns, and the intellectual background of L2 pronunciation research, thereby guiding future research and practice.

This study examined whether university students perceive holds (i.e., a listener’s temporary cessation of dynamic movement) as a visual cue of nonunderstanding. Conversations between English second language (L2) university students were sampled to extract episodes of other-initiated repair through open clarification requests (e.g., what?, sorry?). Brief, silent video clips were presented to 60 raters across two experiments who assessed the listener’s comprehension, which was their perception about how well the listener had understood the speaker. Experiment 1 tested whether raters can differentiate between the onset and release of listener holds while Experiment 2 examined whether they are sensitive to the sequential organization of holds. Results indicated that raters clearly differentiated between hold onsets and releases and were sensitive to the temporal position of holds in the entire repair sequence. Taken together, these findings suggest that holds are a reliable signal of nonunderstanding with potential implications for L2 teaching and assessment.

This study examined how discriminability and prototypicality of nonnative phones modulate the amplitude of the Mismatch Negativity (MMN) event-related brain potential. We hypothesized that if a frequently occurring (standard) stimulus is not prototypical to a listener, a weaker predictive memory trace will be formed and a smaller MMN will be generated for a phonetic deviant, regardless of the discriminability between the standard and deviant stimuli. The MMN amplitudes of Japanese speakers hearing the English vowels /æ/ and /ɑ/ as standard stimuli and /ʌ/ as a deviant stimulus in an oddball paradigm were measured. Although the English /æ/-/ʌ/ contrast was more discriminable than the English /ɑ/-/ʌ/ contrast for Japanese speakers, when Japanese speakers heard the /æ/ standard stimulus (i.e., less prototypical as Japanese /a/) and the /ʌ/ deviant stimulus, their MMN amplitude was smaller than the one elicited when they heard /ɑ/ as a standard stimulus (i.e., more prototypical as Japanese /a/) and /ʌ/ as a deviant stimulus. The prototypicality of the standard stimuli in listeners’ phonological representations modulates the MMN amplitude more robustly than does the discriminability between standard and deviant stimuli.

The present meta-analysis aimed to improve on Involvement Load Hypothesis (ILH) by incorporating it into a broader framework that predicts incidental vocabulary learning. Studies testing the ILH were systematically collected and 42 studies meeting our inclusion criteria were analyzed. The model-selection approach was used to determine the optimal statistical model (i.e., a set of predictor variables) that best predicts learning gains. Following previous findings, we investigated whether the prediction of the ILH improved by (a) examining the influence of each level of individual ILH components (need, search, and evaluation), (b) adopting optimal operationalization of the ILH components and test format grouping, and (c) including other empirically motivated variables. Results showed that the resulting models explained a greater variance in learning gains. Based on the models, we created incidental vocabulary learning formulas. Using these formulas, one can calculate the effectiveness index of activities to predict their relative effectiveness more accurately on incidental vocabulary learning.

The present study uses event-related potentials (ERPs) to examine nonlocal agreement processing between native (L1) English speakers and Chinese–English second language (L2) learners, whose L1 lacks number agreement. We manipulated number marking with determiners (the vs. that/these) to see how determiner-specification influences both native and nonnative processing downstream for verbal number agreement. Behavioral and ERP results suggest both groups detected nonlocal agreement violations, indexed by a P600 effect. Moreover, the manipulation of determiner-number specification revealed a facilitation effect across the board in both grammaticality judgment and ERP responses for both groups: increased judgment accuracy and a larger P600 effect amplitude for sentences containing violations with demonstratives rather than bare determiners. Contrary to some claims regarding the potential for nonnative processing, the present data suggest that L1 and L2 speakers show similar ERP responses when processing agreement, even when the L1 lacks the relevant distinction.

In comparative studies focusing on context of learning, the main contexts under investigation have been study abroad (SA), at-home formal instruction (AH), and domestic immersion (IM). With the global status of English and its burgeoning popularity as a medium of instruction in countries where English only holds the status of a lingua franca, a new SA context has emerged. This study compares the L2 learning of English in this new English as a lingua franca study abroad (ELFSA) context to Anglophone SA and AH in terms of oral and written complexity, accuracy, and fluency gains. Participants’ perceptions of contextual differences concerning the amount of language contact, use, development, and their views toward English are also explored qualitatively. Apart from indicating equal development on most CAF measures after a semester, the qualitative findings highlight ELFSA as providing a low-anxiety atmosphere that helps sojourners gain ownership of English. Thus, ELFSA emerges as an appealing study abroad context for future sojourners.

Both language input and output are important to child language learners’ heritage language development. Nevertheless, existing studies mainly focus on language input, leaving the significance of language output underexplored. The current study assessed 201 kindergarteners’ Mandarin skills (i.e., receptive vocabulary, receptive grammar, and verbal fluency) in Singapore, and investigated the influence of children’s Mandarin experience, and specifically output, on these Mandarin skills. The results based on multilevel models reveal that children’s Mandarin experience plays a crucial role in the three Mandarin skills, after controlling for children’s gender, language aptitude, and English proficiency. Specifically, children’s onset age of Mandarin speaking and the number of places where they used Mandarin alone significantly predict all the Mandarin skills.

There is currently much interest in the role of prediction in language processing, both in L1 and L2. For language acquisition researchers, this has prompted debate on the role that predictive processing may play in both L1 and L2 language learning, if any. In this conceptual review, we explore the role of prediction and prediction error as a potential learning aid. We examine different proposed prediction mechanisms and the empirical evidence for them, alongside the factors constraining prediction for both L1 and L2 speakers. We then review the evidence on the role of prediction in learning languages. We report computational modeling that underpins a number of proposals on the role of prediction in L1 and L2 learning, then lay out the empirical evidence supporting the predictions made by modeling, from research into priming and adaptation. Finally, we point out the limitations of these mechanisms in both L1 and L2 speakers.

Replication is a research methodology designed to verify, consolidate, and generalize knowledge and understanding within empirical fields of study. In second language studies, however, reviews share widespread concern about the infrequency of replication. A common but speculative explanation for this situation is that replication studies are not valued because they lack originality and/or innovation. To better understand and respond to the infrequency of replication in our field, 354 researchers were surveyed about their attitudes toward replication and their practices conducting replication studies. Responses included worldwide participation from researchers with and without replication experience. Overall, replications were evaluated as relevant and valuable to the field. Claims that replication studies lack originality/innovation were not supported. However, dissemination issues were identified: half of published replication studies lacked explicit labeling and one quarter of completed replications were unpublished. Explicit labeling of replication studies and training in research methodology and dissemination can address this situation.

In this focused methodological synthesis, the sample construction procedures of 110 second language (L2) instructed vocabulary interventions were assessed in relation to effect size–driven sample-size planning, randomization, and multisite usage. These three areas were investigated because inferential testing makes better generalizations when researchers consider them during the sample construction process. Only nine reports used effect sizes to plan or justify sample sizes in any fashion, with only one engaging in an a priori power procedure referencing vocabulary-centric effect sizes from previous research. Randomized assignment was observed in 56% of the reports while no report involved randomized sampling. Approximately 15% of the samples observed were constructed from multiple sites and none of these empirically investigated the effect of site clustering. Leveraging the synthesized findings, we conclude by offering suggestions for future L2 instructed vocabulary researchers to consider a priori effect size–driven sample planning processes, randomization, and multisite usage when constructing samples.

Given the longitudinal nature of L2 grit, the use of conventional research methodologies with cross-sectional data to examine the validity of L2 grit scale seems inadequate. The present research was an attempt to extend the domain-specific phase of research on L2 grit, with the pursuit of long-term goals at its core, into a dynamic one. Thus, we adopted a longitudinal confirmatory factor analysis-curve of factors model (LCFA-CFM) approach to trace changes in L2 learners’ grit at different points of time in an EFL course. LCFA-CFM ensures measurement invariance over time, deals with second-order latent variables, takes into account measurement errors, and is capable of assessing interindividual differences. With this in mind, we, first, employed LCFA to test the factor invariance of L2 grit based on a bifactor CFA model over time and, second, used CFM to measure change of L2 grit during an L2 course. To do so, we collected data from 437 adult EFL learners in Iran in four time phases using the L2 grit scale and analyzed them using Mplus 7.4. The model fit was accepted and invariance of the latent factor of L2 grit was confirmed over time. Also, the negative covariance between initial level of L2 grit and its rate of change over time (second-order latent variables) suggested a steeper increase in the construct over time for learners with lower initial scores of the construct. That is, L2 learners who started at a higher level of L2 grit experienced less change in L2 grit over time. The LCFA-CFM ensured that the factor structure of L2 grit is invariant over time and provided insights into how L2 grit changes over an L2 course.

This study offers methodological synergy in the examination of factorial structure in second language (L2) research. It illustrates the effectiveness and flexibility of the recently developed exploratory structural equation modeling (ESEM) method, which integrates the advantages of exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) into one complete measurement model. Two sets of data were collected using the L2 Passion Scale, which measures a dualistic model of passion. Study 1 participants were 220 L2 students. A comparison was made between the CFA and the ESEM models. The results demonstrated the superiority of the ESEM method relative to CFA in terms of better goodness-of-fit indices and realistic correlated factors. These results were replicated in another sample of 272 L2 students, providing support for the predictive validity using a structural ESEM model. Guidelines are provided and Mplus syntax files (codes) are included to help analysts apply the methods. We also make the data available publicly. Overall, this research demonstrated the usefulness of ESEM for examining the construct, discriminant, and convergent validity of L2 scales over CFA.