This study investigated whether the role of working memory capacity varies over the course of second language (L2) morphosyntactic development. Eighty-seven beginning, intermediate, and advanced university L2 Spanish learners completed two nonverbal tasks measuring executive function (EF) and phonological working memory (PWM) in their native language (English) and two tasks measuring knowledge of ten grammatical structures in Spanish at three points during and after a semester of instruction. Robust relationships between both working memory components, especially PWM, and L2 performance, emerged only for lower level learners, particularly at the start of instruction and 3.5 months later. Findings demonstrate that the facilitative effects of cognitive ability appear to lessen with increasing L2 proficiency and empirically support a developmental perspective of L2 learning.

Proficiency is a key variable in late second language (L2) learning, but one that is undermeasured in current research. This study investigates whether L2 oral proficiency can be quickly and reliably assessed via the Spanish “elicited imitation task” (EIT; Ortega, Iwashita, Rabie, & Norris, 1999). Thirty-seven L2 learners of Spanish with varied L2 experience (from low to very advanced) were tested. The EIT’s external validity was assessed via correlation with the simulated oral proficiency interview. Further analyses examined the EIT’s internal reliability, discriminatory power, and usefulness in identifying subgroups (clusters) of learners within the sample. Results strongly support the utility of the Spanish EIT for measurement of oral proficiency in SLA research. Moreover, the availability of parallel EITs in other languages promises to facilitate comparisons across studies. Thus, more precise measurement and analysis of proficiency in SLA research is called for via standardized measurements including the EIT.

This study examined contributions of lexical factors to native-speaking raters’ assessments of comprehensibility (ease of understanding) of second language (L2) speech. Extemporaneous oral narratives elicited from 40 French speakers of L2 English were transcribed and evaluated for comprehensibility by 10 raters. Subsequently, the samples were analyzed for 12 lexical variables targeting diverse domains of lexical usage (appropriateness, fluency, variation, sophistication, abstractness, and sense relations). For beginner-to-intermediate speakers, comprehensibility was related to basic uses of L2 vocabulary (fluent and accurate use of concrete words). For intermediate-to-advanced speakers, comprehensibility was linked to sophisticated uses of L2 lexis (morphologically accurate use of complex, less familiar, polysemous words). These findings, which highlight complex associations between lexical variables and L2 comprehensibility, suggest that improving comprehensibility requires attention to multiple lexical domains of L2 performance.

This study explored the usefulness of dual-task methodology, self-ratings, and expert judgments in assessing task-generated cognitive demands as a way to provide validity evidence for manipulations of task complexity. The participants were 96 students and 61 English as a second language (ESL) teachers. The students, 48 English native speakers and 48 ESL speakers, carried out simple and complex versions of three oral tasks—a picture narrative, a map task, and a decision-making task. Half of the students completed the tasks under a dual-task condition. The remaining half performed the tasks under a single-task condition without a secondary task. Participants in the single condition were asked to rate their perceived mental effort and task difficulty. The ESL teachers provided expert judgments of anticipated mental effort and task difficulty along with explanations for their ratings via an online questionnaire. As predicted, the more complex task versions were found and judged to pose greater cognitive effort on most measures.

The high-variability training paradigm (multiple words, phonetic contexts, and talkers) has been successful for perceptual learning of tone contrasts. Here, it is extended to training native English listeners on Tokyo Japanese pitch-accent contrasts. Participants had no previous experience with lexically contrastive pitch patterns. They learned to identify three pitch patterns in disyllabic Japanese words: 1st-syllable accented, 2nd-syllable accented, and unaccented. Immediate feedback was provided to the training group but not to the control group. The results showed an effect of training on pitch-pattern identification accuracy that was also generalized to new words spoken in new contexts. In contrast, the control group improved only on the 1st-syllable accented pattern. Error analysis suggested that the unaccented pattern is the most difficult to identify. The results are discussed in terms of native language bias and individual bias affecting second language learning in the prosodic domain.

This study investigates whether gestures can be used during recasts to enhance the saliency of a target structure (locative prepositions) and to lead to better production of the target structure. Forty-eight low-intermediate English as a second language (ESL) students partook in communicative activities during which they received either no feedback (control), verbal recasts only (R), or recasts plus gesture (RG), and a subset of participants completed a stimulated recall session. Then the pretest, immediate, and delayed posttest scores of grammar and oral production tests were used to analyze the linguistic development. The results showed that no one commented on recasts or locative prepositions during the stimulated recall session and that there were no significant changes in grammar test scores in all conditions; however, the R and RG conditions performed significantly better in the production test than the control in the immediate posttest. Furthermore, the RG condition maintained the development in the delayed posttest, whereas the R condition did not.

A meta-analysis was conducted to examine the construct validity of language aptitude by synthesizing the existing research that has been accumulated over the past five decades. The study aimed to provide a thorough understanding of the construct by aggregating the data reported in the primary research on its correlations with other individual difference variables and with second language (L2) achievement. A total of 66 studies were retrieved that contributed effect sizes based on 109 unique samples and 13,035 foreign language learners. The results revealed that (1) aptitude was independent of other cognitive and affective factors: it was distinct from motivation, had a negative correlation with anxiety, and overlapped with, but was distinguishable from, intelligence; (2) executive working memory was more strongly associated with aptitude and aptitude components than phonological short-term memory; (3) aptitude measured using full-length tests was a strong predictor of general L2 proficiency, but it had low predictive validity for vocabulary learning and L2 writing; and (4) different aptitude components demonstrated differential predictive validity for different aspects of learning. The findings are useful for tackling a number of conundrums surrounding language aptitude and shed light on how to reconceptualize the construct and reorient the research.