This quasi-experimental study investigated the potential benefits of two corrective feedback techniques (recasts and prompts) for learners of different proficiency levels. Sixty-four students in three intact grade 6 intensive English as a second language classes in the Montreal area were assigned to the two experimental conditions—one received corrective feedback in the form of recasts and the other in the form of prompts—and a control group. The instructional intervention, which was spread over a period of 4 weeks, targeted third-person possessive determiners his and her, a difficult aspect of English grammar for these Francophone learners of English. Participants' knowledge of the target structure was tested immediately before the experimental intervention, once immediately after it ended, and again 4 weeks later through written and oral tasks. All three groups benefited from the instructional intervention, with both experimental groups benefiting the most. Results also indicated that, overall, prompts were more effective than recasts and that the effectiveness of recasts depended on the learners' proficiency. In particular, high-proficiency learners benefited equally from both prompts and recasts, whereas low-proficiency learners benefited significantly more from prompts than recasts.This study is based on the first author's Ph.D. research (Ammar, 2003). We gratefully acknowledge the cooperation of the participating teachers and students. We thank Patsy Lightbown, Roy Lyster, Pavel Trofimovich, and the anonymous SSLA reviewers for their valuable input and feedback on earlier versions of this paper.

This is a report on a computerized experiment with a miniature linguistic system, consisting of five morphological rules and a lexicon of 98 words. Two hypotheses derived from the literature in cognitive psychology and psycholinguistics were tested: that explicit-deductive learning would be better than implicit-inductive learning for straightforward (“categorical”) rules, and that implicit-inductive learning would be better than explicit-deductive learning for fuzzy rules (“prototypicality patterns”). Implicit-inductive learning was implemented by pairing sentences with color pictures; explicit-deductive learning was implemented by means of traditional grammar rule presentation, followed by picture-sentence pairing. The findings were in the expected direction for both hypotheses, but only the first one could be confirmed through statistically significant results.

This study assesses research and reporting practices in quantitative second language (L2) research. A sample of 606 primary studies, published from 1990 to 2010 in Language Learning and Studies in Second Language Acquisition, was collected and coded for designs, statistical analyses, reporting practices, and outcomes (i.e., effect sizes). The results point to several systematic strengths as well as many flaws, such as a lack of control in experimental designs, incomplete and inconsistent reporting practices, and low statistical power. I discuss these trends, strengths, and weaknesses in comparison with methodological reviews of L2 research (e.g., Plonsky & Gass, 2011) as well as reviews from other fields (e.g., education, Skidmore & Thompson, 2010). On the basis of the findings, I also make a number of suggestions for methodological reforms in applied linguistics.

This comparative analysis of teacher-student interaction in two different instructional settings at the elementary-school level (18.3 hr in French immersion and 14.8 hr Japanese immersion) investigates the immediate effects of explicit correction, recasts, and prompts on learner uptake and repair. The results clearly show a predominant provision of recasts over prompts and explicit correction, regardless of instructional setting, but distinctively varied student uptake and repair patterns in relation to feedback type, with the largest proportion of repair resulting from prompts in French immersion and from recasts in Japanese immersion. Based on these findings and supported by an analysis of each instructional setting's overall communicative orientation, we introduce the counterbalance hypothesis, which states that instructional activities and interactional feedback that act as a counterbalance to a classroom's predominant communicative orientation are likely to prove more effective than instructional activities and interactional feedback that are congruent with its predominant communicative orientation.This research was supported by Standard Research Grants (410-98-0175 and 410-2002-0988) awarded to the first author from the Social Sciences and Humanities Research Council of Canada and by a Nihon University Individual Research Grant for 2005 awarded to the second author. A version of this study was presented at the Second Language Research Forum held at Columbia University in October 2005. We are especially grateful to the participating teachers and their students and also to Yingli Yang for her role as research assistant in aggregating the datasets. We thank Sue Gass, Alison Mackey, Iliana Panova, Leila Ranta, and two SSLA reviewers for their helpful comments on earlier versions of this paper.

Interaction has been argued to promote noticing of L2 form in a context crucial to learning—when there is a mismatch between the input and the learner's interlanguage (IL) grammar (Gass & Varonis, 1994; Long, 1996; Pica, 1994). This paper investigates the extent to which learners may notice native speakers' reformulations of their IL grammar in the context of dyadic interaction. Thirty-three adult ESL learners worked on oral communication tasks in NS-NNS pairs. During each of the five sessions of dyadic task-based interaction, learners received recasts of their nontargetlike question forms. Accurate immediate recall of recasts was taken as evidence of noticing of recasts by learners. Results indicate that learners noticed over 60–70% of recasts. However, accurate recall was constrained by the level of the learner and by the length and number of changes in the recast. The effect of these variables on noticing is discussed in terms of processing biases. It is suggested that attentional resources and processing biases of the learner may modulate the extent to which learners “notice the gap” between their nontargetlike utterances and recasts.

This study examines the generalizability of claims by Reber (1989, 1993) about the implicit learning of artificial grammars to the context of adult second language acquisition (SLA). In the field of SLA Krashen (1981, 1982, 1985, 1994) has made claims parallel to those of Reber regarding the differential effectiveness of conscious learning of rules and unconscious incidental acquisition of rules. Specifically addressed are Reber's and Krashen's claims that (a) implicit learning is more effective than explicit learning when the stimulus domain is complex, and (b) explicit learning of simple and complex stimulus domains is possible if the underlying rules are made salient. One hundred four adult learners of English as a second language were randomly assigned to implicit, incidental, rule-search, or instructed computerized training conditions. Speed and accuracy of judgments of novel tokens of easy and hard rule sentence types presented during training were used as dependent measures. Results do not support the first of Reber's and Krashen's claims but do support the second. Implicit learners do not outperform other learners on complex rules, but instructed learners outperform all others in learning simple rules. Analyses of the effect of sentence type and grammaticality on learning suggest a transfer-appropriate processing account of the relationship among consciousness, rule awareness, training, and transfer task performance.

Research has been investigating the role of reading, as one source of input, in language learners' vocabulary development. The present study was designed to examine whether intermediate learners incidentally (a) acquire and (b) retain unknown vocabulary as a result of reading. The study further assessed (c) the effect of the text variable of exposure frequency. Learners were exposed to unfamiliar words either two, four, or six times during reading. Vocabulary acquisition and retention measured productive and receptive knowledge gain. Results indicated that only two encounters with unfamiliar words during reading significantly affected learners' vocabulary growth. Moreover, two or four exposure frequencies resulted in fairly similar word gain, but six exposures produced significantly more vocabulary knowledge. Retention measures showed mixed results: On productive vocabulary knowledge only half of the subjects displayed a significant rate of retention. On receptive knowledge all but one experimental group retained vocabulary over 4 weeks.

When understanding or evaluating foreign-accented speech, listeners are affected not only by properties of the speech itself but by their own linguistic backgrounds and their experience with different speech varieties. Given the latter influence, it is not known to what degree a diverse group of listeners might share a response to second language (L2) speech. In this study, listeners from native Cantonese, Japanese, Mandarin, and English backgrounds evaluated the same set of foreign-accented English utterances from native speakers of Cantonese, Japanese, Polish, and Spanish. Regardless of native language background, the listener groups showed moderate to high correlations on intelligibility scores and comprehensibility and accentedness ratings. Although some between-group differences emerged, the groups tended to agree on which of the 48 speakers were the easiest and most difficult to understand; between-group effect sizes were generally small. As in previous studies, the listeners did not consistently exhibit an intelligibility benefit for speech produced in their own accent. These findings support the view that properties of the speech itself are a potent factor in determining how L2 speech is perceived, even when the listeners are from diverse language backgrounds.This work was supported by two grants from the Social Sciences and Humanities Research Council of Canada to the first two authors. The authors thank J. E. Flege and three anonymous SSLA reviewers for their helpful comments on an earlier version of the paper as well as the listeners and speakers for their willingness to participate in the study. The listening stimuli used here were also used in a paper published in SSLA in 1997.

It is widely agreed that much second language vocabulary learning occurs incidentally while the learner is engaged in extensive reading. After a decade of intensive research, however, the incidental learning of vocabulary is still not fully understood, and many questions remain unsettled. Key unresolved issues include the actual mechanism of incidental acquisition, the type and size of vocabulary needed for accurate guessing, the degree of exposure to a word needed for successful acquisition, the efficacy of different word-guessing strategies, the value of teaching explicit guessing strategies, the influence of different kinds of reading texts, the effects of input modification, and, more generally, the problems with incidental learning. This article briefly surveys the empirical research that has been done on these issues in recent years.

The literature on corrective feedback (CF) that second language writers receive in response to their grammatical and lexical errors is plagued by controversies and conflicting findings about the merits of feedback. Although more recent studies suggest that CF is valuable (e.g., Bitchener, 2008; Sheen, 2007), it is still not clear whether direct or indirect feedback is the most effective, or why. This study explored the efficacy of two different forms of CF. The investigation focused on the nature of the learners’ engagement with the feedback received to gain a better understanding of why some feedback is taken up and retained and some is not. The study was composed of three sessions. In session 1, learners worked in pairs to compose a text based on a graphic prompt. Feedback was provided either in the form of reformulations (direct feedback) or editing symbols (indirect feedback). In session 2 (day 5), the learners reviewed the feedback they received and rewrote their text. All pair talk was audio-recorded. In session 3 (day 28), each of the learners composed a text individually using the same prompt as in session 1. The texts produced by the pairs after feedback were analyzed for evidence of uptake of the feedback given and texts produced individually in session 3 for evidence of retention. The learners’ transcribed pair talk proved a very rich source of data that showed not only how learners processed the feedback received but also their attitudes toward the feedback and their beliefs about language conventions and use. Closer analysis of four case study pairs suggests that uptake and retention may be affected by a host of linguistic and affective factors, including the type of errors the learners make in their writing and, more importantly, learners’ attitudes, beliefs, and goals. The findings suggest that, although often ignored in research on CF, these affective factors play an important role in uptake and retention of feedback.

This study presents and analyzes the comprehension of relative clauses in child and adult speakers of Russian, comparing monolingual controls with Russian heritage speakers (HSs) who are English-dominant. Monolingual and bilingual children demonstrate full adultlike mastery of relative clauses. Adult HSs, however, are significantly different from the monolingual adult controls and from the child HS group. This divergent performance indicates that the adult heritage grammar is not a product of the fossilization of child language. Instead, it suggests that forms existing in the baseline undergo gradual attrition over the life span of a HS. This result is consistent with observations on narrative structure in child and adult HSs (Polinsky, 2008b). Evidence from word order facts suggests that relative clause reanalysis in adult HSs cannot be attributed to transfer from English.

A series of experiments shows that Spanish learners of English acquire the ship-sheep contrast in a way specific to their target dialect (Scottish or Southern British English) and that many learners exhibit a perceptual strategy found in neither Spanish nor English. To account for these facts as well as for the findings of earlier research on second language (L2) speech perception, we provide an Optimality Theoretic model of phonological categorization that comes with a formal learning algorithm for its acquisition. Within this model, the dialect-dependent and L2-specific facts provide evidence for the hypotheses of Full Transfer and Full Access.We would like to thank the audiences of the 25th Penn Linguistics Colloquium (Philadelphia, 2001), Generative Approaches to Language Acquisition 2001 (Palmela), and EuroSLA 11 (Paderborn, 2001) and of talks in Lisbon, Amsterdam, Edinburgh, Utrecht, and Munich, all in 2001 as well, for their questions and remarks, and Rachel Hayes, Michael Sharwood Smith, and five anonymous SSLA reviewers for their helpful comments on earlier versions of this paper. This research was partially sponsored by grant 355-75-003 to Boersma from the Netherlands Organization for Scientific Research (NWO).

This article presents an empirical study that investigates the role of vocabulary knowledge in listening comprehension with 115 advanced Danish learners of English as a foreign language (EFL). The dimensions of depth and breadth of vocabulary knowledge (measured by the Vocabulary Levels Test and the Word Associates Test) were found to be significantly correlated with listening comprehension (measured by a listening test from the Cambridge certificate of proficiency in English) and could predict half of the variance in the listening scores. This study thus provides empirical evidence that vocabulary knowledge is an important factor for successful listening comprehension in EFL. Furthermore, the results suggest that a lexical coverage of 98% is needed for coping with the spoken texts that constitute the listening test. This coverage figure is consistent with findings from reading research.

This paper reports on the influence of formal instruction on L2 acquisition in an instructional experiment with child learners. The main tendency of the findings is that a structure can only be learned under instruction if the learner's interlanguage has already reached a stage one step prior to the acquisition of the structure to be taught.

My hypothesis for an explanation suggests that the teachability of L2 structures is constrained by the same processing restrictions that determine the developmental sequences of natural L2 acquisition: since the processing procedures of each stage build upon the procedures of the preceding stage there is no way to leave out a stage of the developmental sequence by the means of formal teaching. Following such a processing capacity approach I reject the assumption that the constraints on teachability can be explained on the basis of linguistic input.

There are good theoretical and educational reasons to place matters of implicit and explicit learning high on the agenda for SLA research. As for theoretical motivations, perhaps the most central issue in SLA theory construction in need of explanation is the differential success in one's first language (L1) and in one's second language (L2). Although acquisition of an L1 results in full mastery of the language (provided that children are exposed to sufficient quantities of input and do not suffer from mental disabilities), learners of an L2—even after many years of L2 exposure—differ widely in level of attainment. How can we explain universal success in the case of L1 acquisition and differential success in the case of L2 acquisition? Among the many explanations that have been proposed, including brain maturation and brain adaptation processes (critical period), access to Universal Grammar, L1 interference, and sociopsychological factors (see Hyltenstam & Abrahamsson, 2003, for a review), one finds explanations that involve the notions of implicit and explicit learning. Scholars working in different disciplines, in different theoretical schools, and sometimes using different terminology have argued that L1 acquisition (or at least the acquisition of L1 grammar) relies principally on processes of what we might now call implicit learning, whereas the acquisition of an L2 often relies on both implicit and explicit learning (Bley-Vroman, 1991; DeKeyser, 2003; N. Ellis, this issue; R. Ellis, 2004; Krashen, 1981; Reber & Allen, 2000).I am grateful to Rod Ellis for his thoughtful comments on previous versions of this text.

Recasts have figured prominently in recent SLA research, with studies documenting significant advantages for learners exposed to this type of negative feedback. Although some researchers have suggested that such findings imply a beneficial role for negative evidence (i.e., information regarding the impossibility of certain utterances in the language being learned), the source of these benefits has not been explored directly, as multiple variables are conflated in recasts. Specifically, recasts not only offer implicit negative evidence, but they also provide positive evidence. Moreover, recasts are believed to make this positive evidence especially salient. In the present study, 74 learners of L2 Spanish engaged in communicative interaction with the researcher in one of the following conditions: (a) recasts (i.e., negative evidence and enhanced salience of positive evidence), (b) negative evidence, (c) enhanced salience of positive evidence, and (d) unenhanced positive evidence (control). Only the recast and enhanced-salience groups performed significantly better than the control group on posttreatment measures, which suggests that the utility of recasts is derived at least in part from enhanced salience of positive evidence and that the implicit negative evidence they seem to provide may not be a crucial factor.

This study concerns the ability of adults to achieve nativelike competence in second language when the acquisition context lacks formal instruction and, therefore, more closely resembles the environment for first language acquisition. The study presents the results of extensive testing of an adult who has apparently acquired native proficiency in Egyptian Arabic (EA) in an untutored setting. The goal is to determine to what extent her linguistic competence matches that of native speakers. Measures employed to assess her level of achievement are a speech production task, a grammaticality judgment task, a translation task, an anaphoric interpretation task, and an accent recognition task. Results are compared to those of native speakers as well as to those of a proficient learner of EA with extensive formal instruction. The results lead the authors to reexamine the critical period hypothesis while addressing the role of talent in adult language learning. The study concludes with an evaluation of our subject's language learning history to discover what factors differentiate her from less successful naturalistic adult acquirers.

This study investigates the effects of receptive and productive vocabulary learning on word knowledge. Japanese students studying English as a foreign language learned target words in three glossed sentences and in a sentence production task in two experiments. Five aspects of vocabulary knowledge—orthography, syntax, association, grammatical functions, and meaning and form—were each measured by receptive and productive tests. The study uses an innovative methodology in that each target word was tested in 10 different ways. The first experiment showed that, when the same amount of time was spent on both tasks, the reading task was superior. The second experiment showed that, when the allotted time on tasks depends on the amount of time needed for completion, with the writing task requiring more time, the writing task was more effective. If the second experiment represents authentic learning, then a stronger argument can be made to use productive vocabulary learning tasks over receptive tasks.I wish to acknowledge the generous input of the following people in the evolution of this paper: Paul Nation, Jonathan Newton, and Jim Dickie from Victoria University of Wellington, and the anonymous SSLA reviewers, for their helpful comments.

The present study is a follow-up to a classroom experiment with university ESL students that demonstrated incidental acquisition of new lexical knowledge through the reading of thematically related texts. Introspective data from similar students using the same materials are analyzed in this study to explore how vocabulary knowledge may be acquired as a by-product of reading for comprehension. The researchers sought to identify the strategies and the kinds of knowledge and information learners used when dealing with new L2 words they encountered while reading. Learners tended to ignore a large proportion of the words. For those words they attended to, inferencing was the main strategy employed. A taxonomy of the knowledge sources they used in inferring word meanings from various textual and other cues was developed, which provided a framework for describing learners' inferencing behavior. Findings are interpreted in terms of existing research and theory on incidental vocabulary acquisition within an input-processing framework. Pedagogical implications are drawn.