This paper examined lag effects in the learning of second language (L2) grammar. Moreover, following the Desirable Difficulty Framework for L2 practice, the present study investigated whether lag effects could be explained by other sources of difficulty. Using digital flashcards, 117 English language learners (aged 10–18) learned two grammatical structures over two different sessions at a 1-day or 7-day intersession interval (ISI). Learners’ performance was analyzed at two retention intervals (RIs) of 7 and 28 days, respectively. Linguistic difficulty was compared by examining two different structures, while learner-related difficulty was analyzed by comparing learners who differed in terms of age, proficiency, and time required to complete the training. Results showed no main effect of ISI, a main effect of RI, and a small but significant ISI × RI interaction. Linguistic difficulty and age did not interact with ISI or RI. However, longer lags led to significantly higher scores for faster learners and learners of higher proficiency, while shorter lags promoted significantly higher scores for slower learners and learners of lower proficiency. The findings provide some support for the Desirable Difficulty Framework in its potential to explain L2 lag effects.

Using eye tracking, this study examined L2 learners’ real-time processing of novel compounds across repeated exposures during reading. Sixty-one L2 speakers of Chinese read 12 stories over two days. Unbeknown to them, 12 novel compounds were embedded, each occurring six times. Growth curve analyses showed that semantic transparency, working memory capacity, and morphological awareness had no impact on fixation durations for the novel compounds. However, participants with a larger L2 vocabulary size processed novel opaque compounds significantly faster than those with a smaller L2 vocabulary size. For both transparent and opaque compounds, first fixation durations did not change across exposures, yet similar curvilinear decreasing patterns were found in gaze duration and total reading time, with the rates of decrease moderated by L2 vocabulary size and working memory capacity, respectively. Taken together, such findings provide converging evidence supporting the incidental nature of vocabulary learning through natural reading.

Recently, scholars have begun to explore the hypothesis that individual differences in domain-general auditory perception, which has been identified as an anchor of L1 acquisition, could explain some variance in postpubertal L2 learners’ segmental and suprasegmental learning in immersive settings. The current study set out to examine the generalizability of the topic to the acquisition of higher-level linguistic production skills—that is the appropriate use of diverse, rich, and abstract vocabulary. The speech of 100 Polish-English bilinguals was elicited using an interview task, submitted to corpus-/rater-based linguistic analyses, and linked to their ability to discriminate sounds based on individual acoustic dimensions (pitch, duration, and amplitude). According to the results, those who attained more advanced L2 lexical proficiency demonstrated not only more relevant experience (extensive immersion and earlier age of arrival), but also more precise auditory perception ability.

Parental level of education, instruction time, and amount of language practice that children receive have enhanced our understanding of how bilingual and multilingual children learn to comprehend text. Guided by the simple view of reading and the interdependence hypothesis, this longitudinal study conducted in Canadian French immersion programs examined the (a) within- and cross-language association between oral language skills and reading comprehension of bilingual English–French and multilingual children and (b) patterns of growth, while controlling for possible influences of parental level of education and methods of instruction on reading achievement. The sample included 150 children tested once at the beginning of Grade 4 (T1) and again at the end of Grade 4 (T2) and in Grade 6 (T3). Individual growth modeling revealed that bilingual and multilingual children showed similar development in oral language and reading skills across the timeframe. Moreover, growth in English and French reading comprehension was associated with within-language variables. English reading comprehension in Grade 4 was also associated with cross-language variables, including French listening comprehension and vocabulary knowledge. Reading development in the second and third language is enhanced in contexts where classroom instruction, as well as social, economic, and educational opportunities to learn, is equivalent for all students.

The comprehension of Spanish verbal future and past tense of children with developmental language disorder (DLD) was evaluated in an eye-tracking experiment with 96 Spanish- and Catalan-speaking participants distributed in 4 groups: 24 children with DLD (Mage 7.8 years), 24 children with the same chronological age (Mage 7.8), 24 children with the same linguistic level (Mage 6.8 years), and 24 adults (Mage 22.5 years). Empirical data revealed that children with DLD can comprehend verbal tense, at least in the present experimental conditions. Based on the empirical results and despite some minor differences between the DLD group and the chronological control group, we suggest that tense morphology comprehension in DLD might be more typical than what is generally considered. Additionally, we propose that verbal comprehension difficulties in children with DLD might be less related to the lack of understanding of specific morphological markers, and more to an accumulation of difficulty which leads to a linguistic processing slowdown.

Research on English relative clauses shows that, in most studies, subject relatives are comprehended more accurately than object relatives by both monolingual and bilingual children. The current study focuses on Czech-English bilingual children and extends this line of research in two ways. First, it includes a condition in which the noun phrases involved in the action differ in number (one is singular and the other is plural), a manipulation that was never tested on bilinguals. Second, it includes a fine-grained measure of language exposure, since the exposure has been linked to the acquisition of complex structures. Thirty-eight Czech-English bilinguals (aged 8–11 years) were tested on their comprehension of relative clauses using a picture matching paradigm. Results show that sentences with number mismatch were comprehended more accurately than match sentences and that subject relatives were comprehended more accurately than object relatives. In addition, in the subject relatives subset, higher exposure to English corresponded to poorer performance in relative clauses with number mismatch. Possible explanations for these findings are discussed.

The orthographic forms (spellings) of second language (L2) words and sounds affect the pronunciation and awareness of L2 sounds, even after lengthy naturalistic exposure. This study investigated whether instruction could reduce the effects of English orthographic forms on Italian native speakers’ pronunciation and awareness of L2 English sounds. Italians perceive, produce, and judge the same sound as a short sound if it is spelled with one letter and as a long sound if it is spelled with a digraph, due to L1 Italian grapheme-phoneme correspondence (GPC) rules whereby double consonant letters represent long consonants. Totally, 100 Italian learners of English were allocated to two conditions (final n = 88). The participants in the explicit GPC (EGPC) condition discovered English GPC rules relating to sound length through reflection, explicit teaching, and practice; the participants in the passive exposure condition practiced the same words as the EGPC participants, but with no mention of GPCs. Pre- and postintervention production (delayed word repetition) and phonological awareness (rhyme judgment) tasks revealed no positive effects of the instruction. GPC instruction appears to be ineffective in reducing orthographic effects on L2 phonology. Orthographic effects may be impervious to change, whether by naturalistic exposure or by instruction.

It has been found that bilinguals and children from minority backgrounds lag behind monolinguals or those in the majority culture, with respect to prevalence, assessment, and treatment for attention-deficit/hyperactivity disorder (ADHD). This suggests that bilingualism might be yet another factor giving rise to variability in ADHD. Using regression methods, we analyzed parent reports for 394 primary school-age children on background and language experience, ADHD-related behavior, and structural language skill in English to explore whether bilingualism is associated with levels of ADHD-related behavior. Bilingualism as a category was associated with slightly lower levels of ADHD-related behavior. Bilingualism as a continuous measure showed a trend of being associated with lower levels, but this did not quite reach significance. Structural language skill in English was the main predictor of levels of ADHD-related behavior; higher skill predicting lower levels. More investigation is required to confirm whether these effects occur across different populations, to understand which, if any, aspects of bilingualism give rise to variability, and if need be, to address these as far as possible.

This study examined the processing and acquisition of novel words and their collocates (i.e., words that frequently co-occur with other words) from reading and the effect of frequency of exposure on this process. First and second language speakers of English read a story with 1) eight exposures of adjective-pseudoword collocations, 2) four exposures of the same collocations, or 3) eight exposures of control collocations. Results of recall and recognition tests showed that participants acquired knowledge not only of the form and meaning of the pseudowords but also of their collocates. The analysis of eye movements showed a significant effect of exposure on the processing of novel collocations for both first and second language readers, with reading times decreasing as a function of exposure. Eight exposures to novel adjective-pseudoword collocations were enough to develop processing speed comparable to that of known collocations. However, when analyzing the processing of the individual components of the collocations, results showed that eight exposures to the pseudowords were not enough for second language readers to develop processing speed comparable to known words. The frequency manipulation in the present study (four vs. eight exposures) did not lead to differences in the learning or processing of collocations. Finally, reading times were not a significant predictor of vocabulary gains.