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This study examined the relationship of linguistic complexity, captured using a set of lexical richness, syntactic complexity, and discoursal complexity indices, to second language (L2) learners' perception of text difficulty, captured using L2 raters' comparative judgment on text comprehensibility and reading speed. Testing materials were 180 texts abridged from college English coursebooks, and raters were 90 advanced Chinese learners of L2 English. Forty-five raters read paired texts and determined which text was harder to understand in each pair, and another 45 raters read paired texts and determined which text they read faster in each pair. Two stepwise linear regression models containing lexical, syntactic, and discoursal features explained 48.1% and 54.6% of the variance in L2 learners' estimates of text comprehensibility and reading speed, respectively, outperforming four commonly used language readability models. These findings contribute useful insights into the relationship between linguistic complexity and L2 learners' perception of text difficulty.

The impact of text length on the estimation of lexical diversity has captured the attention of the scientific community for more than a century. Numerous indices have been proposed, and many studies have been conducted to evaluate them, but the problem remains. This methodological review provides a critical analysis not only of the most commonly used indices in language learning studies, but also of the length problem itself, as well as of the methodology for evaluating the proposed solutions. Analysis of three data sets of texts produced by English language learners revealed that indices that reduce all texts to the same length using a probabilistic or an algorithmic approach solve the length-dependency problem; however, all these indices failed to address the second problem, which is their sensitivity to the parameter that determines the length to which the texts are reduced. The paper concludes with recommendations for optimizing lexical diversity analysis.

This study is the first to explore microdevelopment in sociolinguistic evaluative judgments of standard German and Austro-Bavarian dialect by adult second language learners of German by using dense time serial measurements. Intensive longitudinal data (10 observations per participant) were collected from four learners at approximately weekly intervals over 3 months. We employed generalized additive models with superimposed periods of significant change to identify rapid developmental phases in individual developmental trajectories. By triangulating these models with qualitative introspective and retrodictive interview data, we identified environmental and psychological stimuli for change. Learners evinced increasing and decreasing periods of significant change, independent of length of residence. Dynamic constellations of identity- and agency-related variables alongside more intensive social interaction with target-variety speakers contributed to significant changes. We discuss findings from a complexity perspective and advocate for microlongitudinal studies in variationist second language acquisition to better capture stimuli for change in learners' emerging multivarietal repertoires.

Previous studies report that exposure to the Maori language on a regular basis allows New Zealand adults who cannot speak Maori to build a proto-lexicon of Maori -- an implicit memory of word forms without detailed knowledge of meaning. How might this knowledge feed into explicit language learning? Is it possible to "awaken" the proto-lexicon in the context of overt language learning? We investigate whether implicit linguistic knowledge represented in a proto-lexicon gives any advantages for intentional language learning in a tertiary educational environment. We conducted a three-task experiment which: (a) assessed participants' Maori proto-lexicon; (b) assessed their phonotactic knowledge; and (c) tested them on Maori vocabulary that they had been exposed to during the course at two time points. The results show that students with larger Maori proto-lexicons learn more words in a classroom setting. This study shows that proto-lexicon acquired from ambient exposure can lead to significant benefits in language learning.

We investigated the role of cue weighting, second language (L2) proficiency, and L2 daily exposure in L2 learning of suprasegmentals different from the first language (L1), using eye-tracking. Spanish monolinguals, English-Spanish learners, and Mandarin--Spanish learners saw a paroxytone and an oxytone verb (e.g., "FIRma-firMÓ" "s/he signs-signed"), listened to a sentence containing one of the verbs, and chose the one that they heard. The three languages have contrastive lexical stress, but suprasegmentals have a greater functional load in Mandarin than in English. Monolinguals predicted suffixes accurately with both stress conditions and favored oxytones, but learners predicted suffixes accurately only with oxytones, the condition activating fewer lexical competitors. Monolinguals predicted suffixes accurately sooner but at a slower rate than did learners. L2 proficiency, but not L1 or L2 exposure, facilitated L2 predictions. In conclusion, learners of a contrastive-stress L1 rely on L2 suprasegmentals to the same extent as monolinguals, regardless of their L1. Lower L2 proficiency and higher cognitive load (more lexical competitors) reduce learners' reliance on suprasegmentals.

We tested whether second language (L2) learners rely more on explicit memory during structural priming at lower than at higher proficiency levels (Hartsuiker & Bernolet, 2017). We compared within-L2 priming with lexical overlap in 100 low and 100 high proficiency French L2 speakers under low versus high working memory load conditions induced with a letter series recall task presented between primes and targets. The high load condition would prevent explicit recall of primes during target production. Both groups primed more under low than high load. The effect of load was similar across groups, but exploratory analyses with proficiency as a continuous variable suggested that, with increasing proficiency, participants primed less under high load. We discuss how these findings support the idea that learners exploit explicit memory more during priming in early versus later stages of acquisition. Overall, this study showed that explicit memory influences syntactic processing across the L2 learning trajectory.

This study examined structural priming during online second language (L2) comprehension. In two self-paced reading experiments, 64 intermediate to advanced Chinese learners of English as a foreign language read coordinated noun phrases where the conjuncts had either the same structure or different structures. Experiment 1 showed that the second conjunct was read faster when it had the same structure as the first. This effect occurred for the structurally marked adjective phrases (e.g., "a simple to grasp problem") but only showed a numerical trend for the less marked relative clauses (e.g., "a problem that was simple to grasp"). Experiment 2 compared unmarked adjective phrases and relative clauses (e.g., "a simple problem" vs. "a problem that was simple") and found significant priming for both. Together, the two experiments showed that L2 comprehension priming could occur without repetition of the lexical head. Moreover, this priming was susceptible to inverse frequency effects, with the less frequent structure exhibiting greater priming.

A central question in multilingualism research is how multiple languages interact. Most studies have focused on first (L1) and second language (L2) effects on a third language (L3), but a small number of studies dedicated to the opposite transfer direction have suggested stronger L3 influence on L2 than on L1 in postpuberty learners. In our study, we provide further support for stronger L3-to-L2 than L3-to-L1 influence and show that it extends to (a) phonetics and the lexicon and (b) childhood learners. Fifty Spanish-Basque-English trilingual adults who had acquired Spanish from birth and Basque between 2 to 4 years of age through immersion participated in a speeded trilingual switching task measuring production of voice onset time and lexical intrusions. Participants experienced more phonetic and lexical crosslinguistic influence from L3 English during L2-Basque production than during L1-Spanish production. These findings show that even highly proficient early bilinguals experience differential influence from a classroom-taught L3 to L1 and to L2.

The present study administered six test instruments to 13- to 14-year-old learners of English in Austria and Sweden (N = 213), countries offering settings with more explicit and implicit learning environments, respectively. Confirmatory Factor Analyses for Austria yielded a factor comprising timed grammaticality judgment tests, an oral narrative test, and elicited imitation, labelled in this study Automatized and/or Implicit Knowledge, and a factor including an untimed grammaticality judgment test and a metalinguistic knowledge test, named in this study Explicit Knowledge. In the Swedish context, goodness-of-fit indices provided some evidence that a single-factor model shows a better fit, although a comparison of this model with two-factor models did not reach statistical significance. The findings point to the potential importance of considering the specificities of a learning environment in interpreting learner achievement on measures of the implicit versus explicit knowledge spectrum.

A large number of children are exposed to more than one language. One well-established method of assessing early vocabulary development in monolingual children is parent report; however, its use in bilingual/multilingual contexts is less established and brings unique challenges. In this methodological scoping review, we reviewed studies of early vocabulary development using parent report with bilingual/multilingual children (January 1980-March 2022). A total of 576 articles were screened, yielding 101 studies for analysis. The number of studies on bilingual/multilingual vocabulary has grown in the last two decades; yet representation of the world's languages remains sparse. The majority of studies assessed bilingual/multilingual children's vocabulary in each language and used instruments adapted for linguistic and cultural characteristics. However, the field could benefit from standardized reporting practices regarding definitions of bi/multilingualism, selection of reporters, and tool development and is in critical need of studies that develop, validate, and norm parent report instruments specifically for the bilingual/multilingual case.

This study examined putative benefits of testing and production for learning new languages. Undergraduates (N = 156) were exposed to Turkish spoken dialogues under varying learning conditions (retrieval practice, comprehension, verbal repetition) in a computer-assisted language learning session. Participants completed pre- and posttests of number- and case-marking comprehension, a vocabulary test, and an explicit awareness questionnaire. Controlling for nonverbal ability and pretest scores, the retrieval-practice group performed highest overall. For number/case marking, the comprehension and retrieval-practice groups outperformed the verbal-repetition group, suggesting benefits of either recognition- or recall-based testing. For vocabulary, the verbal-repetition and retrieval-practice groups outperformed the comprehension group, indicating benefits of overt production. Case marking was easier to learn than number marking, suggesting advantages for learning word-final inflections. Explicit awareness correlated with comprehension accuracy, yet some participants demonstrated above-chance comprehension without showing awareness. Findings indicate the value of incorporating both practice tests and overt production in language pedagogy.

Chinese learners of English often experience difficulty with English tense presumably because their native language is tenseless. We showed that this difficulty relates to their incomplete conceptual representations for tense rather than their poor grammatical rule knowledge. Participants made acceptability judgments on sentences describing two-event sequences that were either temporally plausible or misaligned according to verb tense (time clash). Both upper-intermediate Chinese learners of English and native English speakers were able to detect time clashes between events, showing that Chinese participants could apply tense rules explicitly. However, a predicted modulation of the N400 event-related brain potential elicited by time clashes in English-speaking participants was entirely absent in Chinese participants. In contrast, the same Chinese participants could semantically process time information when it was lexically conveyed in both languages. Thus, despite their mastery of English grammar, high-functioning Chinese learners of English failed to process the meaning of tense-conveyed temporal information in real time.

This article presents the ENglish Reading Online (ENRO) project that offers data on English reading and listening comprehension from 7,338 university-level advanced learners and native speakers of English representing 19 countries. The database also includes estimates of reading rate and seven component skills of English, including vocabulary, spelling, and grammar, as well as rich demographic and language background data. We first demonstrate high reliability for ENRO tests and their convergent validity with existing meta-analyses. We then provide a bird's-eye view of first (L1) and second (L2) language comparisons and examine the relative role of various predictors of reading and listening comprehension and reading speed. Across analyses, we found substantially more overlap than differences between L1 and L2 speakers, suggesting that English reading proficiency is best considered across a continuum of skill, ability, and experiences spanning L1 and L2 speakers alike. We end by providing pointers for how researchers can mine ENRO data for future studies.

Since its first adoption as a computational model for language learning, evidence has accumulated that Rescorla-Wagner error-correction learning (Rescorla & Wagner, 1972) captures several aspects of language processing. Whereas previous studies have provided general support for the Rescorla-Wagner rule by using it to explain the behavior of participants across a range of tasks, we focus on testing predictions generated by the model in a controlled natural language learning task and model the data at the level of the individual learner. By adjusting the parameters of the model to fit the trial-by-trial behavioral choices of participants, rather than fitting a one-for-all model using a single set of default parameters, we show that the model accurately captures participants' choices, time latencies, and levels of response agreement. We also show that gender and working memory capacity affect the extent to which the Rescorla-Wagner model captures language learning.

Second language (L2) speakers often experience difficulties in learning words with L2-specific phonemes due to the unfaithful lexical encoding predicted by the fuzzy lexical representations hypothesis. Currently, there is limited understanding of how allophonic variation in the first language (L1) influences L2 phonological and lexical encoding. We report how the Mandarin Chinese L1 phonemic inventory and allophonic variation subject to phonotactic constraints predict phonological encoding problems for novel L2 English words with the /v/-/w/ contrast. L1 English and L1 Chinese participants speaking two varieties of Mandarin Chinese differing as to the presence of [[voiced labiodental approximant]]-[w] allophonic variation for the /w/ phoneme participated in a vocabulary learning task. The novel L2 words with the /v/-/w/ contrast were systematically less robustly encoded than the control words on the day of training and 24 hours later. The degree of fuzziness in lexical representations was jointly predicted by L1 allophonic variation subject to phonotactic constraints and L2 phonological categorization.

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 of their first 4 months of study abroad. Then, we linked the participants' gains in comprehensibility (ease of understanding) and accentedness (linguistic nativelikeness) to their individual difference and experience profiles. The participants' gains in comprehensibility were associated mainly with the amount of their interaction with fluent English speakers during immersion and secondarily with certain cognitive (grammatical inferencing) and sociopsychological (extraversion) individual differences. Furthermore, the amount of interactive L2 use mediated the effect of sociopsychological individual differences (extraversion and potentially ideal L2 self). In contrast, gains in accentedness tended to be less subject to experience effects but could be affected by certain pronunciation-related cognitive individual differences (phonemic coding).

In this study, we examined the effect of previewing unfamiliar vocabulary on the real-time reading behavior of first language (L1) and second language (L2) readers. University students with English as their L1 or L2 read passages with embedded pseudowords. In a within-participant manipulation, definitions of the pseudowords were either previewed before reading or reviewed after reading. Previewing significantly affected reading behavior on early and late eye-movement measures, and the patterns of change on the first three contextual encounters with the pseudowords differed for L1 and L2 readers. On the multiple-choice cloze posttest, encountering novel words in reading followed by definitions resulted in somewhat more accurate responses for L1 but not L2 participants. The learning condition did not affect the results of the meaning recall posttest. These findings contribute to a more nuanced understanding of the relationship between vocabulary support approaches and the reading behavior of L1 and L2 readers when they encounter unfamiliar words in texts.

This study investigated how much practice is necessary for learners to attain durable second language (L2) grammar knowledge. Using digital flashcards, 119 participants practiced translating 12 sentences into an artificial language, followed by feedback, until they had typed all sentences correctly. Participants repeated this activity in one, two, three, or four relearning sessions on consecutive days. After a 14-day delay, all groups scored highly on a receptive test. However, scores on a productive test were substantially higher for groups with three or four relearning sessions. Accuracy tended to peak on the 3rd day of training. An analysis by individual training performance revealed that participants attained durable productive knowledge if they completed two sessions without errors, regardless of how many sessions they had performed in total. The findings provide a timeframe for processes described in skill retention theory (Kim et al., 2013) and suggest a performance benchmark to indicate when learners have gained procedural L2 grammar knowledge.

Previous studies have shown that prior linguistic knowledge affects semantic implicit learning when stimuli are presented in the first language. We report an experiment that investigated whether such crosslinguistic influence from the first language would still emerge in the second language for semantic implicit learning of novel articles and fire/water semantic category mappings, a semantic distinction that is explicitly marked by semantic radicals in Chinese but not in English and a type of form-meaning connections that has not been investigated. We found that 30 Cantonese-English bilinguals and 30 native English speakers learned the target form-meaning connections and that the knowledge that they developed may have been implicit, as shown through post-experiment verbal reports. Moreover, the bilingual group was significantly faster than the English group in distinguishing fire/water English nouns. These findings extend the range of semantic-based regularities that can be learned at the implicit level and suggest that the markings of fire/water distinctions in Chinese affect second language task performance.

Second language (L2) listening comprehension is a function of many variables. We focused on metacognitive awareness, which we measured using the Metacognitive Awareness Listening Questionnaire (MALQ; Vandergrift et al., 2006), and meta-analyzed (a) the factor structure of the MALQ and (b) the relationship between metacognitive awareness and L2 listening comprehension. We used meta-analytic structural equation modeling to synthesize 29 studies that provided Pearson's product-moment correlation matrices from 4,574 learners. Results showed (a) that the MALQ measured metacognitive awareness as a single factor with five subcomponents (their interrelationship and relative contribution to metacognitive awareness varied) and (b) that metacognitive awareness explained listening comprehension (b* = .306). The results were moderated by publication type, the response format of listening comprehension tests, and participant type. The findings can help researchers to better conceptualize the construct of metacognitive awareness in relation to listening comprehension as well as to score metacognitive awareness.

Research has suggested that long spacing (i.e., temporal intervals) within a training session facilitates second language vocabulary learning. Studies, however, have been limited to treatment that involved sessions for only initial learning but not subsequent relearning. Furthermore, most studies have investigated only the benefits of spacing without considering its potential costs (i.e., increased duration of the treatment). In our study, we examined the benefits and costs of within-session spacing for both initial learning and relearning. In this study, 170 Japanese-speaking university students learned 20 English-Japanese word pairs using one of the following four combinations of initial and relearning spacing: long-long, long-short, short-long, and short-short spacing. The results showed that introducing long spacing for both initial learning and relearning (long-long) led to better long-term retention and higher efficiency scores (i.e., number of words learned per trial) despite the increased duration of the treatment. These findings suggest that the benefits of long spacing outweigh its costs.

This paper introduces the Lang-Track-App, a smartphone application and backend system to aid second language acquisition researchers in implementing the experience sampling method (ESM). Surveying research participants with the Lang-Track-App multiple times per day can yield exceptionally rich data that can be analyzed in multiple ways. This article explains the different Lang-Track-App components and describes workflows for both researchers and participants. To demonstrate the step-by-step implementation, we present a recent study of language use in study abroad as a test case in which we used the Lang-Track-App to collect ESM data about frequency and qualitative aspects of language use. A selection of findings from this study highlights the richness of ESM data and how they can be analyzed at various levels. Researchers wishing to use the Lang-Track-App to implement the ESM in their own research can access the full open-source code and documentation via GitHub (https://github.com/HumlabLu).

We investigated indexical variation as a variable that promotes second language (L2) vocabulary learning across language modalities. In three experiments, we presented Catalan Sign Language signs (Experiments 1a and 1b), pseudowords (Experiment 2), and English words (Experiment 3) to participants in three conditions that varied in the number of people who introduced these stimuli (one, three, or six people). We evaluated learning outcomes in two recall tasks: a picture-to-L2 naming task and a L2-to-L1 translation task. For the sign modality, indexical variation benefitted the immediate recall of signs in the translation task (Experiment 1a) and delayed recall after two weeks in the picture naming task (Experiment 1b). For the oral modality, we observed no effect when participants learned pseudowords (Experiment 2), but variability benefited recall in the translation task when participants learned English words (Experiment 3). We discuss these contrastive results, considering the influence of indexical variation in adult L2 sign and oral vocabulary learning.

Second language implicit learning research has shown that a variety of linguistic features can be acquired without awareness. However, this research overwhelmingly uses comprehension tests to measure implicit learning. It remains unclear whether newly acquired implicit knowledge can also be recruited for production. To address this question, we developed a novel paradigm based on elicited recall and false memory that was used to both train participants and test their implicit knowledge in production, including generating new instances of the rule. Participants learned a semiartificial language containing a rule based on one in a natural language (the alternation between Czech spatial prepositions v and na). Participants who remained unaware of the rule, as assessed by verbal report, nevertheless were able to use it in a production test involving novel items, while believing that they were performing a cued recall test. Even without extensive training, newly acquired implicit knowledge can immediately be evident in production.

Second language (L2) learners make gender errors with possessive pronouns. In production, these errors are modulated by the gender match between the possessor and possessee noun. We examined whether this so-called match effect extends to L2 comprehension by attempting to replicate a recent study on gender predictions in first language (L1) German speakers (Stone, Veríssimo, et al., 2021). By comparing Spanish and English learners of L2 German whose languages have different possessive constraints, we were able to examine whether the match effect was modulated by the participants' L1. A first experiment suggested that predictions and match effects were absent in setups with complex visual displays. A second experiment with simpler displays successfully elicited predictions and match effects, but their size was comparable in Spanish and English speakers, inconsistent with crosslinguistic influence. We interpret our results as evidence that processing difficulties with possessives result from memory interference that impacts both L1 and L2 comprehenders.

Over the last two decades, the question of to which linguistic cues learners pay attention when they decode a new language has been subject to controversy in the field of third language (L3) acquisition. In this article, we present an artificial language learning experiment that investigated how lexical and syntactic similarities between an artificial L3 and preexisting grammars impact crosslinguistic influence at the very beginning of the acquisition process. We exposed four groups of 30 Norwegian-English bilinguals each to one of four L3s and gave them training in that L3. The participants gave forced-choice acceptability judgments on pairs of nonsubject-initial declarative clauses that differed in word order, one grammatical in English, the other grammatical in Norwegian. The participants had not been exposed to nonsubject-initial declaratives during the exposure and training phases to avoid confounds with learning. The results showed that both lexical and syntactic similarities affect crosslinguistic influence. We discuss this result considering contemporary accounts of L3 acquisition.

Recent research has shown that knowledge of second language (L2) collocations is important to learners for improving their language processing and production but also that acquiring L2-specific collocations is a very burdensome task for learners. Thus, bootstrapping knowledge of L2 collocations through generalization is highly desirable, but this area has received surprisingly limited attention. This study examined L2 learners' ability to generalize knowledge of recently learned verb-noun collocations during processing and whether this type of learning occurred via intralexical associations in the L2 (similarity) or was facilitated by known collocations in learners' first language (L1). Mixed-effects regression targeting measures of learners' brain event-related potentials revealed cross-language influence during real-time processing that preceded learners' acceptability judgments. Both within- and cross-language similarity influenced learners' behavioral judgments. These findings revealed cross-language integration in L1-L2 incongruent collocations from the earliest moments of processing.

Usage-based approaches to additional-language acquisition have identified numerous determinants of language learning, two of which were the focus of our study: frequency and cue contingency. Specifically, we examined how an immersion experience may impact sensitivity to these two determinants as reflected in the production of 4,808 pairs of nouns (N) and adjectives (ADJ) by 50 anglophone learners of Spanish and French. We analyzed the use of N/ADJ combinations using mixed linear regressions for frequency and two measures of delta P, a unidirectional measure of lexical association strength reflecting cue contingency. In all three models, we explored the impact of time and four additional variables: task, initial proficiency, target language, and phraseological unit. Our analysis revealed stasis over time. Additionally, our analysis revealed phraseological unit, task, and target language each to be significant in at least one model; initial proficiency did not contribute to significantly predicting phraseological use.

In this study, we assessed metacognition in nonnative language speech perception and production. Spanish novice learners of French identified and produced the French vowel contrast /ø/--/oe/ and, on each trial, rated their confidence in their responses. Participants' confidence in perception predicted their identification accuracy, suggesting that novice learners' metacognitive skills in nonnative speech perception are efficient at the onset of language learning. However, participants' confidence in production did not align with a fine-grained precision measure of their own production (indexed by Mahalanobis distance to the native French target-vowel space) nor with a categorical measure of production (in terms of being within/outside the native speakers' zone), indicating that metacognition in nonnative sound production is not yet efficient in novice learners. Overall, confidence ratings were similar and highly correlated between the perception and production tasks, but there was no association between the two domains in task performance or metacognitive ability. We discuss the ramifications of these findings for language learning theories and language teaching strategies as well as for the ongoing debate about the perception-production relationship.

In this study, we investigated the accuracy of first language (L1) and second language (L2) speakers' intuitive judgments of phrasal frequency and collocation strength, and examined the linguistic influences that give rise to these judgments. L1 and L2 speakers of English judged 180 adjective-noun collocations as (a) high frequency, medium frequency, or low frequency and (b) high association, medium association, or low association. Results showed that neither L1 nor L2 speakers demonstrated accurate intuitive judgments of phrasal frequency and association strength. Both groups of participants employed linguistic information at phrase and single-word levels when giving intuitive statistical estimates. We found judgments of phrasal frequency and association strength to be intertwined for both L1 and L2 speakers. Taken together, these findings shed new insight on understanding language users' statistical knowledge of multiword sequences.

We examined whether input modality and individual differences in attention and motivation influence second language (L2) learning via syntactic priming. In an online study, we compared the primed production of English passives by 235 L2 and native English speakers in reading-to-writing versus listening-to-writing conditions. We measured immediate priming (producing passives immediately after exposure to passives) and short- and long-term learning (producing more passives in immediate and 1-week delayed posttests relative to pretests). Both groups showed immediate priming and short- and long-term learning, although L2 speakers produced more passives with immediate priming and showed greater long-term learning. Learning was unaffected by modality, but immediate priming was greatest in the listening-to-writing condition across groups. Individual differences in attention and motivation did not influence priming or learning. Thus, syntactic priming fosters long-term L2 learning regardless of input modality, but participants may be sensitive to the frequency of passives in spoken versus written language during immediate priming.

This study reports on a self-paced reading experiment exploring whether the figurativeness of collocations affects L2 processing of collocations. The participants were 40 English native speakers and 44 Chinese-speaking English foreign language learners (including doctoral, postgraduate, and undergraduate students). To ensure that the effect emerged from the figurativeness of collocations rather than other item-related confounds, this study added a literal-literal comparison (e.g., choose a career vs. choose a house) as a control to the experimental figurative-literal comparison (e.g., build a career vs. build a house). Results showed that L2 speakers processed figurative collocations more slowly than literal collocation controls but native speakers did not. Importantly, this processing cost for figurative collocations in L2 speakers varied by L2 proficiency but not phrase familiarity. We discuss the results in terms of the dual-route model of formulaic and novel language processing and also incorporate them into the literal salience model of bilingual figurative processing.

We use a novel paradigm to examine the effect of language exposure and variable input on the acquisition of words in primary school--aged children. Children growing up with different languages and foreign or regional accents in their input might benefit from their experience with variability when learning new words from peers with unfamiliar accents. We ask to what extent language and accent experience helps monolingual and bilingual children learn new words in the context of accent variability. Children (aged 7-11 years) played a computerized card game with virtual peers that resembles natural advanced lexical acquisition, during which new words are learned from child speakers and are produced actively in peer-group interactions. Successful word learning was predicted by the amount of input in regional and foreign accents but not by exposure to other languages (i.e., bilingualism). We discuss how accent experience affects word learning under variable input conditions.

The current study investigated the effects of repetition on the learning of second language (L2) spoken word forms. Japanese university students learning L2 English were randomly assigned to one of three treatment conditions (one, three, and six exposures) and learned 40 words while hearing them and viewing their corresponding pictures. A picture-naming test was administered before, immediately after, and approximately one week after the treatment. The elicited speech samples were evaluated for two aspects of spoken vocabulary knowledge: pronunciation (accentedness and comprehensibility) and form-meaning connection (spoken form recall). Results showed that (a) the number of exposures positively affected measures of form-meaning connection and pronunciation immediately after the treatment, and (b) cognateness moderated how strongly repetition impacted the pronunciation of L2 words. Moderate learning gains occurred for comprehensibility after six exposures to new words. However, with six exposures, only small effects of repetition were observed for accentedness.

This study explores the effects of receptive derivational affix knowledge, derivative frequency, part of speech, and vocabulary breadth on production of derivatives. Twenty-one speakers of English as a first language and 107 learners of English as a second language were asked to produce derivatives for 90 prompt words on a decontextualized derivative form-recall test. Results indicated that (a) increased receptive derivational affix knowledge and derivative frequency were linked to greater accuracy in production of derivatives, (b) adverb derivatives were more frequently produced compared to other parts of speech, and (c) learners' vocabulary breadth was associated with greater accuracy in producing derivatives. Results also indicated a larger facilitative effect of derivative frequency for second language learners in comparison to first language speakers, but this effect diminished as vocabulary breadth increased. These findings suggest that learners may initially acquire derivatives on a case-by-case basis but, as their knowledge of derivational affixes and vocabulary breadth increases, they may acquire derivatives more systematically.

Researchers often make claims regarding the importance of predictor variables in multiple regression analysis by comparing standardized regression coefficients (standardized beta coefficients). This practice has been criticized as a misuse of multiple regression analysis. As a remedy, I highlight the use of dominance analysis and random forests, a machine learning technique, in this method showcase article for accurately determining predictor importance in multiple regression analysis. To demonstrate the utility of dominance analysis and random forests, I reproduced the results of an empirical study and applied these analytical procedures. The results reconfirmed that multiple regression analysis should always be accompanied by dominance analysis and random forests to identify the unique contribution of individual predictors while considering correlations among predictors. I also introduce a web application for facilitating the use of dominance analysis and random forests among second language researchers.

The past decades have seen an explosion of research using electrophysiological or neuroimaging techniques for studying the neurocognitive underpinnings of second language (L2) processing. Although this field has a shorter history than does research on language learning more generally, important insights into the neurocognitive basis of L2 processing have driven it to the center stage of language science. In this target article for "Language Learning's" 75th Jubilee volume, I illustrate the field's impressive achievements by selectively reviewing electrophysiological and neuroimaging research on L2 processing and bilingual brain organization. I also review changing perspectives in the field (including individual difference and experience-based perspectives, neural network approaches, neuroplasticity, and L2-learning related neural changes) and identified challenges, promises, and future directions (revisit native-speaker benchmark, increase linguistic diversity, enhance ecological validity, intensify research on child L2 learners' brain, adopt lifelong approach to L2 learning) that can lead to a better understanding of the neural underpinnings of L2 learning and processing.

Open research practices are relevant to all stages of research, from conceptualization through dissemination. Here, we discuss key facets of open research, highlighting its rationales, infrastructures, behaviors, and challenges. Part I conceptualizes open research and its rationales. Part II identifies challenges such as the speed and cost of open research, the usability of open data and materials, the difficulties of conducting replication research, and the economics and sustainability of open access and open research generally. In discussing these challenges, we have sought to provide examples of good practice, describe and evaluate emerging innovations, and envision change. Part III considers ongoing coevolutions of culture, infrastructure, and behaviors and acknowledges the limitations of our review and of open research practices. We argue that open research is indeed a large part of our future, and most--if not all--challenges are surmountable, but doing so requires significant changes for many aspects of the research process.

The last two decades have seen a significant amount of interest in bilingual language learning and processing. A number of computational models have also been developed to account for bilingualism, with varying degrees of success. In this article, we first briefly introduce the significance of computational approaches to bilingual language learning, along with a discussion of the major contributions of current models, their implications, and their limitations. We show that the current models have contributed to progress in understanding the bilingual mind, but significant gaps exist. We advocate a new research agenda integrating progress across different disciplines, such as computational neuroscience, natural language processing, and first language acquisition, to construct a pluralist computational account that combines high-level cognitive theories and neurobiological foundations for bilingual language learning. We outline the contributions and promises of this interdisciplinary approach in which we view bilingual language learning as a dynamic, interactive, and developmental process.

Which theoretical and empirical insights can inform language-in-education research that advances equitable and high-quality learning at school? In this three-part article, I first draw from various sources to foreground the urgent need to counteract linguicism and epistemic injustices and to commit to more just and rigorous scientific practices in research and education. Based on findings from my own research, I then argue that more just and rigorous practices need to attend to midadolescents' individual differences in language learning. In response, I present insights from recent innovative evidence-based pedagogical frameworks and tools that reveal promising paths forward. I close by calling for research with a dual focus on equity and rigor that supports moving away from "pedagogies of silence," which silence marginalized students' voices, damaging their identities and obstructing their learning, towards "pedagogies of voices," which affirm all learners' voices while amplifying their language repertoires and their critical learning.

We conducted a multisite replication of Yang and Lyster's (2010) study investigating the effects of recasts and prompts on learning English regular and irregular past tense. Our study was conducted with intact high school and vocational school classes in Italy and Bosnia. Our participants were young adolescents (14-15 and 16-17 years old), a population that has been largely ignored in second language acquisition (SLA) research. We followed the design of the original study, but we also included a few modifications regarding the elicitation materials. The findings from our study did not fully align with Yang and Lyster's results. We found no effect of group and no evidence of the superiority of either prompts or recasts in either written or oral data in either Bosnia or Italy. However, we found a steady increase in scores over time from pretest to posttests in oral data in all groups at both sites.

This study presents a corpus-based investigation of self-repairs in hearing adult L2 (M2L2, second modality and second language) learners of Swedish Sign Language ("Svenskt teckenspråk," STS). This study analyses M2L2 learners' STS conversations with a deaf signer and examines the learners' self-repair practices and whether there are differences among learners of different proficiency levels. This provides a description of characteristics of self-repair made by M2L2 learners as well as the frequency and distribution of self-repair categories. The results show that the frequency of self-repair decreases with increased proficiency, at least after the initial stage. Furthermore, the self-initiated repair categories of the beginners are often phonological repairs, while intermediate learners tend to carry out self-repairs at the lexical and syntactic level. The results also reveal a specific type of STS repair linked to fingerspelling repairs. We discuss the effects of second modality learning as well as the relationship between monitoring and language proficiency.

We investigated whether sign-naïve learners can infer and learn the meaning of signs after minimal exposure to continuous, naturalistic input in the form of a weather forecast in Swedish Sign Language. Participants were L1-English adults. Two experimental groups watched the forecast once (n = 40) or twice (n = 42); a control group did not (n = 42). Participants were then asked to assign meaning to 22 target signs. We explored predictors of meaning assignment with respect to item occurrence frequency and three facets of visual motivation: iconicity, transparency, and gesture similarity. Meaning assignment was enhanced by exposure and item frequency, thereby providing evidence for implicit language learning in a new modality, even under challenging naturalistic conditions. Accuracy was also contingent upon iconicity and transparency, but not upon gesture similarity. Meaning assignment at first exposure is thus visually motivated, although the overall low accuracy rates and further qualitative analyses suggest that visually motivated meaning assignment is not always successful.

Foreign language classrooms have historically used classroom lecture-based approaches for instruction. However, the flipped pedagogical approach was recently introduced into foreign language and other classrooms. Studies of the flipped classroom approach in spoken L2 classrooms have generally found a positive impact on student learning outcomes, perceptions and satisfaction compared with the traditional classroom approach. Cripps et al. (2021) found no difference in student learning outcomes and satisfaction between L2 American Sign Language traditional and flipped classrooms each taught by two different instructors. This study is a partial replication of Cripps et al. (2021) with both classes taught by the same instructor, using the traditional classroom data from the original study and comparing it to new data from the same instructor teaching in the flipped approach. Results show no major differences, suggesting that the flipped classroom approach is as viable as the traditional classroom approach regardless of the instructor.

This multisite study replicates Webb, Newton, and Chang's (2013) study on the effect of repetition on incidental learning of multiword units (MWUs). Even though more researchers have started to investigate MWUs, most data have been collected from university students. Furthermore, the large effect of MWU repetition on learning reported by Webb et al. has not yet been corroborated. Data in our study were collected from two university samples (EFL students in Poland and Flanders) and one nonuniversity sample (Flemish EFL learners in secondary schools). Unlike Webb et al., we adopted a counterbalanced within-participants design. Participants read and listened to a modified graded reader in which target MWUs occurred 1, 5, 10, or 15 times. In line with the initial study, we found a positive effect of repetition. However, the learning gains were smaller, and the number of repetitions needed was different. The findings were consistent across the university and nonuniversity samples. The study concludes with a discussion of these findings in relation to both pedagogical implications and the benefits of multisite replication research.

This article responds to calls for greater inclusivity in second language acquisition research and, more specifically, to calls to explore further the impact of first language literacy on second language oracy (e.g., Tarone et al., 2009). We conducted a partial replication of Foster and Skehan's (1996) influential study of task complexity, planning time, and performance over measures of complexity, accuracy, and fluency. The initial study and others had provided robust evidence to suggest that planning time had a positive impact on task performance, particularly for more cognitively demanding tasks. We conducted our replication with adult second language learners with low first language literacy, most of whom were former refugees. Contrary to previous studies, the findings indicate little to no evidence that planning time led to improved linguistic performance. It is not immediately clear why this should be so, and our findings highlight the need for further research with this underrepresented group.

Additional language (L2/Ln) research largely focuses on learners whose first languages are spoken and who are learning additional spoken languages. In the past few decades, sign languages have become increasingly popular for hearing students in schools. These students must not only learn the vocabulary and grammar of sign languages but also manage a different modality (that is, the channels of production and reception of language) than their first language. This raises questions about the role of both language and modality in the L2/Ln learning of sign languages for non-signers. In other cases, deaf and hearing signers of a sign language learn a different sign language, raising questions about L2/Ln learning in the signed modality. This "Special Issue" consists of empirical contributions and a conceptual review article that examine how language and modality shape the learning of sign languages as additional languages. Theoretical issues concerning learning a sign language as another language are discussed.

The comprehension of signed language requires linguistic and visual-spatial processing, such as perspective-taking for correctly interpreting the layout of a spatial scene. However, little is known about how adult second-language (L2) learners process visual-spatial constructions in a signed language that they are studying, including which angles of viewing are most challenging to process and whether there are relationships between perspective-taking and the comprehension of non-spatial (i.e., non-scene based) constructions. We examine the performance of 95 intermediate signers of American Sign Language (ASL) on linguistic and non-linguistic perspective-taking tests. Half the participants completed a test of narrative comprehension that included visual-spatial scenes, and half took a test of signed phonological and morphophonological discrimination. Performance on linguistic perspective-taking correlated moderately with performance on the narrative, but not with the discrimination test. These findings support the claim that perspective-taking skills are yoked to some--but not all--aspects of signed language learning.

This study reports on strategies to indicate plural referents in hearing learners of Sign Language of the Netherlands. This is the first explorative study that focuses on L2 expressions of plurality in a sign language. Using data from two datasets, I examined when learners start to express plural and which strategies they apply, and I noted typical learner characteristics. The first study examined spontaneous conversations of three learners, during the first 18 months of their learning. The second study analyzed elicited data from 11 learners during their first year of learning. The data reveal that learners are able to express plural referents in early stages, using strategies that are familiar to them (quantifiers) as well as strategies that do not occur in their mother tongue (reduplication of the noun, use of spatial devices). The early emergence might be explained by the salient nature of the devices and the resemblance with gestural portrayals.

This study addresses the role of awareness in learning and the variables that may facilitate adult second language (L2) implicit learning. We replicated Williams's (2005) study with a similar group of academic learners enrolled at university as well as a group of non-college-educated adults in order to explore the generalizability of the findings to an underrepresented population in research on L2 acquisition. Our results revealed that academic learners implicitly acquired items encountered during training (trained items), but this learning disappeared when academic and nonacademic groups were combined. We also observed modest correlations between intelligence and implicit learning of trained items; however, this association disappeared when other variables were considered. Overall, our study highlights the limited potential of implicit form--meaning associations for L2 adults in more general populations and emphasizes the challenges associated with convenience sampling in L2 research (Andringa & Godfroid, 2020). Additionally, it underscores the independence of individual differences in reading exposure, years of education, and nonverbal intelligence for implicit learning of trained items.