It is often claimed that child English L2 learners take up to seven years to attain English skills commensurate with those of monolingual peers; however, existing research is insufficient to know if this claim is valid for oral language abilities in particular. This study examined the lexical and morphological abilities of English L2 learners and their monolingual peers (ages 12–15; N = 227) in Canadian middle schools to determine the timeline for convergence with monolinguals, and what factors predict individual differences among L2 learners. Having seven or more years of schooling was insufficient for all L2 learners to converge with monolinguals on all measures; moreover, growth in English abilities slowed after seven years. Regression analyses revealed that use of English with friends, parental education, and cognitive skills predicted individual variation in the L2 learners’ English abilities and, thus, contributed to their potential for convergence with monolinguals.

Eighty Japanese learners of English as a foreign language encountered 40 target words in one of four experimental conditions (three encounters, six encounters, three encounters with talker variability, and six encounters with talker variability). A picture-naming test was conducted three times (pretest, immediate posttest, and delayed posttest) and elicited speech samples were scored in terms of form-meaning connection (spoken form recall) and word stress accuracy (stress placement accuracy and vowel duration ratio). Results suggested that frequency of exposure consistently promoted the recall of spoken forms, whereas talker variability was more closely related to the enhancement of word stress accuracy. These findings shed light on how input quantity (frequency) and quality (variability) affect different stages of lexical development and provide implications for vocabulary teaching.

Access to definitions facilitates the learning of word meanings when novel words are encountered in reading. However, the memorial costs and benefits of inferring word meanings from context, compared to seeing definitions of unfamiliar words before reading, are not yet well understood. We conducted two experiments with adult L1 (English) and L2 (Chinese) readers to investigate whether the development of declarative and nondeclarative word knowledge benefits more when definitions are supplied before reading (errorless treatment) or after reading (trial-and-error treatment). Study participants encountered 90 target vocabulary items three times in short informative texts under errorless or trial-and-error conditions and entered their meaning inferences immediately after reading each text. Posttreatment, we evaluated participants’ declarative knowledge of the target items using a meaning generation (recall) task and nondeclarative knowledge using a self-paced reading task. The trial-and-error treatment followed by definitions resulted in a superior declarative and nondeclarative knowledge, compared to the errorless treatment, for L1 and L2 readers. Inference errors affected the development of declarative but not nondeclarative knowledge, and the trajectory of the development of nondeclarative knowledge was different for L1 and L2 readers. We interpret these findings in terms of the declarative and nondeclarative memory processes underpinning contextual word learning.

Personality has been identified as a possible antecedent to emotions experienced in the foreign language (FL) classroom. However, contrasting results and differing personality models have resulted in ambiguous findings. This study set out to delve deeper into the role of personality as a predictor of FL emotions through a series of increasingly restrictive statistical models on a sample of n = 246 FL learners. The relationships between personality—operationalized as global and lower order factors in the five factor model—and the FL emotions of Foreign Language Enjoyment, Anxiety, and Boredom were examined. The global factors of Neuroticism, Extraversion, and Conscientiousness, and the lower order factors of Trust, Dutifulness, and Cheerfulness were significant predictors of FL emotions. However, the complexity of personality as a predictor variable is demonstrated in the intricacy of the results and as such the inclusion of personality in explanatory models of FL emotions ought to be approached with caution.

This article reexamines Bley-Vroman’s original (1990) and evolved (this issue) fundamental difference hypothesis that argues that differences in path and endstate of first language acquisition and adult foreign language learning result from differences in the acquisition procedure (i.e., language faculty and cognitive strategies, respectively). The evolved assessment of the theoretical and empirical developments of the past 20 years is taken into account with respect to Universal Grammar and parameters in generative theory and with respect to cognition and acquisition in data processing. This article supports the spirit of Bley-Vroman’s proposals in light of the discussion of three topics: pathway of acquisition, endstate age of acquisition effects, and language processing by monolinguals and bilinguals. I argue that the difference between child and adult language acquisition is, above all, quantitative not qualitative, a gradient continuum rather than a precipitous break.

We present findings of an investigation into the acquisition of the English /s/–/ʃ/ contrast by native speakers of Korean and Japanese. Both of these languages have the phones [s] and [ʃ], and both languages exhibit a pattern—or motivate a rule—whereby /s/ is realized as [ʃ] before the vowel [i] and the glide [j]—that is, high front vocoids. The crucial difference, and the focus of this study, is that in Korean [s] and [ʃ] are allophones of /s/, whereas in Japanese the two sounds arguably instantiate different phonemes. We present production data showing that the differences in the functioning of [s] and [ʃ] in the second language learner’s native language have different consequences for the acquisition patterns and the error types produced in the learning of this contrast.

This study is a comparative examination of reading behavior of first-language (L1) Canadian and second-language (L2) Finnish and German readers of English. We measured eye-movement patterns during reading the same set of English sentences and administered tests of English vocabulary, spelling, and exposure to print. The core of our study is a novel method of statistical prediction used to generate hypothetical Finnish and German participants with maximum observed L1 scores in all component skills. We found that with L1-like component skills, hypothetical German readers can show the same reading speed as the L1 group. We hypothesize this advantage comes from the small linguistic distance to English. Conversely, hypothetical Finnish readers remain disadvantaged even with maximum component skills, likely due to a larger linguistic distance. We discuss theoretical and applied implications of our method for L2 acquisition research.

Despite the prevalence of quantitative approaches in applied linguistics (AL) and second language acquisition (SLA) research (Gass, 2009), evidence indicates a need for improvement in analyzing and reporting SLA data (e.g., Larson-Hall & Plonsky, 2015). However, to improve quantitative research, researchers must possess the statistical knowledge necessary to conduct quality research. This study assesses AL and SLA researchers’ knowledge of key statistical concepts on a statistical knowledge test. One hundred and ninety-eight AL and SLA researchers from North America and Europe responded to 26 discipline-specific questions designed to measure participants’ ability to (a) understand basic statistical concepts and procedures, (b) interpret statistical analyses, and (c) critically evaluate statistical information. Results indicate that participants generally understood basic descriptive statistics, but performance on items requiring more advanced statistical knowledge was lower. Quantitative research orientation, number of statistics courses taken, and frequent use of statistics textbooks had positive influences on researchers’ statistical knowledge.

The multidimensional conceptualization of vocabulary knowledge has been extraordinarily influential in lexical research. Yet, the few studies that have empirically explored the structure of word knowledge conflict regarding its multidimensionality. The present study examines the nature of L2 vocabulary knowledge by exploring how the hypothesized word-knowledge dimensions fit together across different L2 learner groups. A total of 314 EFL learners from two dissimilar L1 backgrounds (Chinese n = 170; Spanish n = 144) were assessed using eight vocabulary measures testing recognition and recall knowledge of form-meaning, collocations, multiple meanings, and derivatives. Confirmatory factor analysis (CFA) revealed that vocabulary knowledge behaves as a unidimensional construct for each learner group individually. Simultaneous multigroup CFA confirmed that this unidimensional model holds invariant across the two groups regardless of their distinct L1s. These findings provide empirical evidence for the unidimensionality of vocabulary knowledge in a second language, indicating the need to refine the conceptualization of the construct.

This study investigates children's changing sensitivity to processing cues for identifying agent (word order, case marking, and animacy) as a function of proficiency in a second language. English-speaking learners of Japanese need to appropriately adjust cue strengths in moving from a rigid SVO language to one in which SOV word order is a good general processing strategy, but case marking must ultimately be relied on if it conflicts with this order. English-speaking children in grades K–7 in an immersion school were asked to identify the agent for a set of audiotaped sentences in English and Japanese. The children in this study learned to use SOV word order, lexical semantics, and canonical case marking, but they do not provide evidence of appropriately exploiting noncanonical case marking. We suggest that these results might be accounted for by the context in which input is processed in immersion school classrooms.

DeKeyser (2000) reports a study in which he examines three hypotheses concerning the existence of a critical period for second language acquisition. He concludes that his data support all three predictions and that the notion of a critical period is the best account of the data. However, there are problems in both his interpretation of the data and the issues raised in his discussion that undermine that conclusion. The present paper examines the evidence for the three hypotheses proposed by DeKeyser and argues that the data do not provide the necessary support for the interpretation that a critical period has influenced the results.

Precise auditory perception at a subcortical level (neural representation and encoding of sound) has been suggested as a form of implicit L2 aptitude in naturalistic settings. Emerging evidence suggests that such implicit aptitude explains some variance in L2 speech perception and production among adult learners with different first language backgrounds and immersion experience. By examining 46 Chinese learners of English, the current study longitudinally investigated the extent to which explicit and implicit auditory processing ability could predict L2 segmental and prosody acquisition over a 5-month early immersion. According to the results, participants’ L2 gains were associated with more explicit and integrative auditory processing ability (remembering and reproducing music sequences), while the role of implicit, preconscious perception appeared to be negligible at the initial stage of postpubertal L2 speech learning.

Despite extensive theoretical and empirical research, we do not have estimations of the magnitude of sensitivity to grammatical information during L2 online processing. This is largely due to reliance on null hypothesis significance testing (Plonsky, 2015). The current meta-analysis draws on data from one elicitation technique, self-paced reading, across 57 studies (N = 3,052), to estimate sensitivity to L2 morphosyntax and how far L1 background moderates this. Overall, we found a reliable sensitivity to L2 morphosyntax at advanced proficiencies (d = .20, 95% CIs .15, .25), with some evidence that this was reliably lower than for native speakers (NSs). These patterns were not generally moderated by linguistic feature or sentence region. However, effects for anomaly detection were larger among NSs than L2 learners and the effects among L2 learners appeared to show a trend toward L1 influence. Finding smaller effects than in other subdomains, we provide an initial framework of reference for L2 reading time effect sizes.

Although the problem of word class has been explored in numerous first language studies, relatively little is known about this process in SLA. The present study measures second language (L2) learners’ knowledge of word class distinctions (e.g., noun vs. adjective) in a variety of syntactic contexts. English-speaking learners of Spanish from third-semester and third-year courses (N = 240) completed a receptive task that presented contrasting forms belonging to the same word family (e.g., feliz “happy” and felicidad “happiness”). The results indicate that learners from both groups are often unable to distinguish among word classes. In particular, learners have significant difficulty in discriminating between adjectives and nouns. Although ambiguous surface morphology contributes to word class confusions, the results suggest that L2 learners do not always recognize derivational suffixes that clearly mark word class. These difficulties are interpreted as stemming from weak syntactic morphological knowledge as well as incomplete knowledge of L2 distributional regularities.

In this article, we aim to contribute to the debate about the use of subordination as a measure of language proficiency. We compare two theories of SLA—specifically, processability theory (PT; Pienemann, 1998) and dynamic systems theory (DST; de Bot, Lowie, & Verspoor, 2007)—and, more particularly, how they address the development of subordinate clauses. Whereas DST uses measures from the complexity, accuracy, and fluency research tradition (see Housen & Kuiken, 2009), PT uses the emergence criterion to describe language development. We focus on the development of subordinate clauses and compare how subordination as such is acquired and how the processing procedures related to a specific subordinate clause word order are acquired in the interlanguage of second language German and Swedish learners. The learners’ language use shows that the use of subordination (as measured by a subordination ratio) fluctuates extensively. From the beginning of data collection, all learners use subordinate clauses, but their use of subordinate clauses does not increase linearly over time, which is expected by DST. When focusing on processability and the emergence of subordinate clause word order, however, a clear linear developmental sequence can be observed, revealing a clear difference between the nonacquisition and the acquisition of the subordinate clause word order rules. Our learner data additionally reveal a different behavior regarding lexical and auxiliary or modal verbs.

Individual differences (IDs) largely contribute to success in adult second language attainment (e.g., Dörnyei, 2006). Heritage language (HL) studies have also explored the role of IDs, namely psychosocial variables, and biographical factors with an adult HL learner population. However, the specific contribution of these variables to HL learners' performance on linguistic tests that differ in degree of explicitness and modality remains unknown. Therefore, the current study tested 103 adult HL learners of Spanish who completed a spoken elicited imitation task (EIT) and a written untimed grammaticality judgment task (UGJT) that elicited their knowledge of vulnerable morphosyntactic structures in HL bilingual acquisition. To investigate the contribution of individual learner factors on their performance, participants completed a few questionnaires. Mixed-effects regression models revealed that sequential bilingual status, willingness to communicate, generation and motivation contributed significantly, but yet differentially to participants' performance on grammatical and ungrammatical items of the EIT and UGJT.

This paper presents an experimental study of the rarely explored question of how input through instruction interacts with L2 acquisition at the level of modular linguistic knowledge. The investigation focuses on L2 knowledge of the English polarity item any, whose properties are only partially covered by typical language-teaching materials. We investigate Najdi-Saudi Arabic-speaking learners’ knowledge of the distribution of any in contexts that are taught, contexts that are not taught but may be observable in the input, and contexts that are neither taught nor observable. We further test whether conscious awareness of instructed rules about any correlates with performance. Our findings suggest a role for instruction and for internal, UG-constrained acquisition, and that these two paths interact. We explore our findings in terms of Sharwood Smith and Truscott’s (2014a, 2014b) framework of modular online growth and use of language, in which cognitive development is driven by processing.