High Proficiency Bilinguals Research Articles

Do we mean the same? Semantic native-likeness in highly proficient second language users

Research question: Native-likeness (similarity between non-native and native users of the same language) depends on second language proficiency (L2p). However, evidence comes mainly from phonological or syntactic tasks, prompting an underexplored question: can higher L2p also entail a more native-like organization of semantic memory? Methodology: We asked high and low proficiency bilinguals to describe concepts in their second (English) and first (Spanish) language. We then compared their responses with semantic structure norms from native speakers of each language, and derived measures of semantic native-likeness through a validated semantic proximity measure. Data and analysis: We examined whether semantic native-likeness scores discriminated between high and low L2p levels at the group level (via inferential statistics) and at the individual level (via machine learning analyses). Findings: We found that semantic associations in English were more native-like in high than in low L2p bilinguals. Machine learning analyses showed that this pattern was highly consistent across individual subjects. Responses in Spanish did not differ between groups. Originality: This is the first study assessing semantic native-likeness through concept-feature associations in high and low L2p bilinguals, both at the group- and the individual-level. Significance: Our findings suggest that increased L2p entails a more native-like organization of semantic memory, informing models of bilingual cognition and its links with experience-related variables.

The effects of cross-linguistic similarity on phrase-level language switching: evidence from high-proficient Chinese-English bilinguals.

Previous research on language switching has debated whether high-proficient bilinguals exhibit symmetrical costs and one underlying reason for which may be the potential influence of cross-linguistic characteristics. The previous conflicting findings suggest their impact on language switching needs to be further investigated. In this study, we recruited 36 high-proficient Chinese-English bilinguals and investigated the effect of cross-linguistic similarity on the switching of quantifier expressions under three switch conditions. The results showed that switch costs were significantly greater when the quantifier expression was similar between Chinese and English than when it was different. Larger switch costs were found in the alternate switch condition than those in the non-switch or random switch conditions. In addition, participants exhibited larger switch costs when switching to the first language than when switching to the second language. The results suggest that the similarity of quantifier expressions between the first language and the second language would create more competition and thus induce larger switch costs in phrase-level language switching, which may be derived from the inner word recognition system of the mental lexicon. This study further improves the relevant theories on the origin of switch costs by supporting the Language Non-Specific Selection Hypothesis.

Bilingual Stroop Effect in High and Low Proficient Nepali-English Bilinguals

This research article presents experimental psycholinguistic study on high and low proficient Nepali – English bilingual adults. Language comprehension was measured using lexical decision tasks and language production was measured using verbal fluency task. Executive control was measured using bilingual Stroop task in mouse tracking paradigm. The results show high proficient bilinguals show the bilingual advantage in language comprehension, language production and executive control tasks.

The non-native phonetic perception mechanism utilized by bilinguals with different L2 proficiency levels

Aims: The present study investigated whether bilinguals differing in L2 proficiency are different in their non-native phonetic perception mechanism. Methodology: An event-related potential (ERP) experiment was conducted, in which high and low L2 proficiency bilinguals were asked to focus their attention on a muted film while listening pre-attentively to phoneme contrasts arranged in the Oddball paradigm. Non-native and native phonetic conditions were investigated in two separate blocks. Data and analysis: The mean amplitudes of the ERP epochs time-locked to the onset of phonemes were analyzed within four consecutive time windows: 50–150 ms, 150–250 ms, 250–350 ms, and 350–600 ms. Repeated measures analyses were performed on the following factors: phonetic condition (non-native vs. native) × deviancy (standard vs. deviant) × brain region (frontal vs. parietal) × proficiency (high vs. low). Phonetic condition, deviancy, and brain region were within-subjects factors, whereas proficiency was a between-subjects factor. Findings: In the non-native phonetic condition, a deviancy effect in the form of mismatch negativity (MMN) and late discriminative negativity (LDN) ERP components was observed in bilinguals with high L2 proficiency, whereas the P3b and late positive component (LPC) were found in those with low L2 proficiency. In the native phonetic condition, the two proficiency groups were the same in the deviancy effect as manifested by their similar brain responses in the form of the MMN component. Originality: This was the first study to take native phonetic condition into consideration while investigating the relationship between L2 proficiency and non-native phonetic discrimination. Significance/implications: The current findings suggest that high L2 proficiency might be related to faster involuntary phonetic discrimination and efficient high-level phonetic evaluation, whereas low L2 proficiency bilinguals may need to rely on additional memory processing. Findings of this study provide more evidence for the perceptual plasticity in pre-attentive non-native phonetic processing as a function of L2 proficiency.

Interference suppression in bilingualism: Stimulus-Stimulus vs. Stimulus-Response conflict

AbstractStudies examining the potential effects of bilingualism on interference suppression show inconsistent results. Our study approaches this topic by distinguishing two potential subcomponents within interference suppression (i.e., Stimulus-Stimulus and Stimulus-Response conflict). We investigated the two subcomponents through their operationalisation in different tasks and examined the role of language proficiency in modulating it. A sample of 111 young adult participants performed four non-linguistic cognitive tasks measuring both visual and auditory domains of cognitive control. Bilinguals outperformed monolinguals in tasks involving Stimulus-Stimulus conflict, but showed comparable performance in tasks involving Stimulus-Response conflict. Specific effects of language proficiency on cognitive control were observed: group differences in auditory inhibition and visual orienting were only observed between high-proficient bilinguals and monolinguals. Taken together, types of conflicts involved in interference tasks and language proficiency could differentially affect performance in monolinguals and bilinguals.

Cerebral lateralisation of first and second languages in bilinguals assessed using functional transcranial Doppler ultrasound

Background: Lateralised language processing is a well-established finding in monolinguals. In bilinguals, studies using fMRI have typically found substantial regional overlap between the two languages, though results may be influenced by factors such as proficiency, age of acquisition and exposure to the second language. Few studies have focused specifically on individual differences in brain lateralisation, and those that have suggested reduced lateralisation may characterise representation of the second language (L2) in some bilingual individuals. Methods: In Study 1, we used functional transcranial Doppler sonography (FTCD) to measure cerebral lateralisation in both languages in high proficiency bilinguals who varied in age of acquisition (AoA) of L2. They had German (N = 14) or French (N = 10) as their first language (L1) and English as their second language. FTCD was used to measure task-dependent blood flow velocity changes in the left and right middle cerebral arteries during phonological word generation cued by single letters. Language history measures and handedness were assessed through self-report. Study 2 followed a similar format with 25 Japanese (L1) /English (L2) bilinguals, with proficiency in their second language ranging from basic to advanced, using phonological and semantic word generation tasks with overt speech production. Results: In Study 1, participants were significantly left lateralised for both L1 and L2, with a high correlation (r = .70) in the size of laterality indices for L1 and L2. In Study 2, again there was good agreement between LIs for the two languages (r = .77 for both word generation tasks). There was no evidence in either study of an effect of age of acquisition, though the sample sizes were too small to detect any but large effects. Conclusion: In proficient bilinguals, there is strong concordance for cerebral lateralisation of first and second language as assessed by a verbal fluency task.

Cerebral lateralisation of first and second languages in bilinguals assessed using functional transcranial Doppler ultrasound

Background: Lateralised language processing is a well-established finding in monolinguals. In bilinguals, studies using fMRI have typically found substantial regional overlap between the two languages, though results may be influenced by factors such as proficiency, age of acquisition and exposure to the second language. Few studies have focused specifically on individual differences in brain lateralisation, and those that have suggested reduced lateralisation may characterise representation of the second language (L2) in some bilingual individuals.Methods: In Study 1, we used functional transcranial Doppler sonography (FTCD) to measure cerebral lateralisation in both languages in high proficiency bilinguals who varied in age of acquisition (AoA) of L2. They had German (N = 14) or French (N = 10) as their first language (L1) and English as their second language. FTCD was used to measure task-dependent blood flow velocity changes in the left and right middle cerebral arteries during phonological word generation cued by single letters. Language history measures and handedness were assessed through self-report. Study 2 followed a similar format with 25 Japanese (L1) /English (L2) bilinguals, with proficiency in their second language ranging from basic to advanced, using phonological and semantic word generation tasks with overt speech production.Results: In Study 1, participants were significantly left lateralised for both L1 and L2, with a high correlation (r = .70) in the size of laterality indices for L1 and L2. In Study 2, again there was good agreement between LIs for the two languages (r = .77 for both word generation tasks). There was no evidence in either study of an effect of age of acquisition, though the sample sizes were too small to detect any but large effects. Conclusion: In proficient bilinguals, there is strong concordance for cerebral lateralisation of first and second language as assessed by a verbal fluency task.

Investigating the Speed of Lexical Activation in the Bilinguals' L1 and L2 through Forward and Backward Translation Task

The relationship between lexical activation in L1 and L2 was investigated using a backward and forward translation task. Bilingual Arabic-English speakers first translated forward from L1 to L2, then backward from L2 to L1. Two groups of participants were established (high and low proficient bilinguals). The translation task included words that were being translated in both L1 and L2. The goal of the study was to see how strong the relation between L1 and L2 translation is. The findings of the study revealed that bilingual memory relations are asymmetric: translation from L1 to L2 is conceptually mediated, but the translation from L2 to L1 is lexically mediated.

Language proficiency moderates the effect of L2 semantically related distractors in L2 spoken word production

Bilinguals differ substantially in their second language (L2) proficiency, but it remains unclear whether language proficiency modulates the effect of L2 semantically related distractors in L2 spoken word production. In the present study, two groups of high proficiency and low proficiency Chinese-English bilinguals named target pictures in their L2 accompanied by visually superimposed L2 distractor words while electroencephalogram signals were recorded. Distractor names were semantically related or unrelated to target names. Variables of L2 proficiency (high proficiency or low proficiency) and semantic relatedness (related or unrelated) were manipulated in the experiment. Behavioral results demonstrated an interaction between L2 proficiency and semantic relatedness, with a semantic interference effect appearing only in high proficiency bilinguals. Waveform analysis indicated that semantic relatedness only exerted significant effects on event-related potentials in high proficiency bilinguals around 300–500 ms post picture presentation. Source localization analysis revealed that semantically related distractors induced higher brain activations in the left middle and superior temporal regions among high proficiency bilinguals, while higher brain activations were found in the right prefrontal cortex among low proficiency bilinguals. Taken together, these findings substantiate the role of language proficiency in determining whether L2 semantically related distractors are sufficiently activated to exceed the competition threshold and interfere with L2 picture naming.

Language proficiency, sociolinguistic factors and inhibitory control among bilinguals

Bilingualism interacts with cognitive control mechanisms, particularly inhibitory control. It is believed that language proficiency as a measure of the degree of bilingualism may influence inhibitory control. However, this interaction is modulated by sociolinguistic factors associated with bilingual experience. We examined the relationship between language proficiency and inhibitory control and the influence of sociolinguistic factors by comparing high and low proficient Hindi–English bilinguals, and by using a correlational design. A standard go/no-go task with varying proportions of go and no-go trials was used. Study-1 showed that age of acquisition, language use in formal/informal setting, and bilingual switching influenced the interaction between L2 proficiency and inhibitory control. In general, high proficient bilinguals were better at regulating inhibitory control when the demand on inhibition was high compared to that of low proficient bilinguals. Study-2 showed that contextual switching and setting-based use of L2 predicted inhibitory control in a high monitoring condition while use of L1 predicted inhibitory control irrespective of inhibitory demands. However, contextual switching strengthened the interaction between L2 proficiency and inhibitory control whereas use of L1 moderated the relationship between L1 proficiency and inhibitory control. We did not find a significant effect of non-language variables such as fluid intelligence, socioeconomic status, and participation in skilled activities on the relationship between language proficiency and inhibitory control. We emphasize on the role of both L1 and L2 proficiency and the use of a correlational design to investigate the relationship between bilingualism and inhibitory control.

How does the language acquisition period affect simultaneous interpreters’ language processing?

Abstract This study aims to identify the similarities and differences in cognitive-psychological semantic (Translation Equivalent) mapping employed by early, and late balanced bilinguals at the adult level. The subjects of lexical-semantic recognition tasks were limited to fourth-semester learners at graduate school of interpreting and translation to analyze the effect that the L2 acquisition period (or Age of Acquisition, AOA) and immersive education may have on cross-language processing among highly-proficient bilinguals. The experimental words were composed of non-cognate abstract words with two levels, and in four language directions (L1 > L1, L1 > L2, L2 > L1, L2 > L2) to compare monolingual, and bilingual priming effects. Early, and Late Balanced Bilingual groups (i.e., EBB and LBB) were comparable in many ways. However, mid balanced bilinguals who had exposure of more than six years after the critical period showed distinctive features. With a low lexical difficulty in the L1 to L2 direction, Mid Balanced Bilingual group (MBB) showed a similar tendency with EBB, while it was analogous to LBB when the lexical difficulty was high, and the language direction was from L2 to L1. Such results can be interpreted as evidence against the critical period hypothesis, indicating that language dominance may change due to the L2 acquisition period and immersive education. In contrast to their subjective perception, the mother tongue of all subject groups turned out to be Korean since all subjects, without exception, were faster in deciding words from English to Korean. The parental factor was limited to be all Koreans in order to control biological differences, from which the parental factor is reversely inferred most influential for early balanced bilinguals’ language dominance.

High proficient bilinguals bring in higher executive control when encountering diverse interlocutors

We examined if bilinguals are sensitive to contextual factors with regard to the presence of interlocutors and if this reflects in how they modulate their executive control. First, we introduced Telugu–English bilinguals to monolingual, bilingual and neutral interlocutors in the form of cartoon characters through an interactive session. Following this, they performed the attention network task (ANT) with the image of interlocutors appearing on every trial before the flankers. High proficient bilinguals (in L2) were overall faster on the ANT (indicating higher executive control) when different interlocutors appeared randomly in a mixed block compared to the low proficient bilinguals. However, this effect was not found when the appearance of the interlocutors along-side the ANT task was blocked. These data demonstrate that high proficient bilinguals brought in higher executive control when the context required higher monitoring (different interlocutors appearing randomly) compared to the low proficient bilinguals. We interpret the findings with regard to the adaptive control hypothesis.

The impact of language proficiency on the time course and neural basis of L2 semantic access in bilinguals

Aims: The present study aimed to explore the impact of L2 proficiency on the time course and neural basis of L2 semantic access. Methodology: Two groups of participants with either high or low L2 proficiency performed a picture–word semantic matching task (i.e. consistent vs. inconsistent), with their event-related potentials (ERP) responses being recorded. Two stimulus types, L2 words and L1 words, were investigated in two separate blocks. Here the L1 words were tested as a control condition. Data and Analysis: The ERP epochs time-locked to the onset of the word were analyzed within 300–600 ms both at the surface (i.e. mean amplitude and peak latency) and the source (i.e. source localization) level. Findings/Conclusions: In the L2, a reliable N400 effect (i.e. semantic incongruity effect) was found for both high and low L2 proficiency bilinguals. However, the difference waves showed that the N400 peak latency was much shorter and the mean amplitude within 300–600 ms was much larger in bilinguals with higher L2 proficiency. Source localization analysis found left insula cortex (Brodmann area 13, Low > High) to be responsible for this proficiency effect (i.e. a decrease in the activation of left insula at a higher proficiency level). In the L1, a reliable N400 effect was found for both participant groups, and the two groups were matched in the N400 peak latency and amplitude, and its neural source. Originality: This study provides further evidence for the neural substrates underlying the modulation of L2 proficiency in semantic access by using a more sensitive task (i.e. picture–word matching task), and the current results revealed the engagement of left insula for the first time. Significance/Implications: The current findings suggest that L2 proficiency affects the time course and neural basis of L2 semantic access, probably through a modulation of the strength of “L2 word-to-concept” connections.

Age and Proficiency in the Bilingual Brain Revisited: Activation Patterns Across Different L2-Learner Types

Second language (L2) proficiency and age of acquisition (AoA) are important when examining L2 neural representation. However, they are potential confounds of each other and their relative importance remains unclear. How L2 was learnt (informally vs. formally at school) is another complication that potentially contributes further to this lack of clarity. Careful control of these variables is crucial for teasing apart their effects, yet almost all previous neuroimaging studies have studied one or the other in isolation. 35 participants of varying proficiency and AoA were scanned using fMRI while performing an English (L2) past tense task; all were formal L2 learners. Early high proficiency bilinguals (EAHP) were contrasted with late high proficiency (LAHP) in three conditions: (i) regular inflection; (ii) irregular inflection and (iii) regularity x AoA. In line with previous findings, LAHP (vs. EAHP) bilinguals showed more extensive activation across multiple regions for both regular and irregular inflection. The left inferior frontal gyrus (IFG; BA47) was one region that showed significant activation in condition (iii). EAHPs engaged this region selectively for regular but not irregular inflection while LAHPs activated it during both types of inflection. Late high and late low proficiency (LALP) bilinguals were also contrasted in three conditions: (i) regular inflection; (ii) irregular inflection and (iii) regularity x proficiency. In all regions showing significant differences, LAHPs showed greater activation relative to LALPs (regular and irregular conditions). In the regularity x proficiency condition the left IFG was also a significantly activated region. Previous studies suggest this region is positively associated with high proficiency but this has not always been replicated. LAHPs showed increased activation in BA45 but not BA44, suggesting L2 is a controlled rather than automatic process in this group despite being highly proficient. Our study suggests AoA and proficiency both influence bilingual brain activation independently, an important replication given only two other neuroimaging studies have experimentally manipulated both variables within the same study. We also provide evidence for how different AoA influences left IFG engagement during L2 processing, and for the hypothesis that BA45 is associated with high proficiency when degree of automaticity is lower.

Language proficiency in bilinguals enhances action preparedness and control

We examined if bilinguals with superior L2 proficiency perform better on tasks that call for motor preparedness and anticipatory monitoring. While many have studied conflict resolution in isolation, few have explored how control related to action preparation and conflict interaction in the case of bilinguals. We compared high and low proficient Hindi–English bilinguals on a saccadic Stroop task where participants had to program saccades towards visual targets while execution time was manipulated. The results showed that high proficient bilinguals incurred lesser cost when incongruent and congruent trials of the Stroop task were mixed. High proficient bilinguals also committed fewer errors. However, there was no group difference with regard to overall speed of response. This result indicates superior conflict adaptation when monitoring demands are high which suggests that higher practice of bilingualism may influence the action control system including the monitoring system. We discuss the data with regard to bilingualism and its eventual impact on the perceptual and cognitive systems.

Effects of language proficiency on cognitive control: Evidence from resting-state functional connectivity

Cognitive studies suggest that bilingualism plays an additional role in the development of cognitive control, specifically in that bilingualism has been found to promote cognitive abilities in switching and inhibition. In recent years functional neuroimaging studies suggest that long-term experience of speaking two languages results in changes of neural activity in the cognitive control network. Here we explore the impacts of second language proficiency on intrinsic functional connectivity of the executive function network using resting-state functional MRI. Seed regions centering on different components of cognitive control were selected for the resting-state functional connectivity (rsFC) analysis based on previous studies. We performed a functional connectivity analysis of high- versus low-proficiency bilinguals and found that language proficiency affected distinct components of the cognitive control system. Specifically, for switching, the rsFC of high-proficiency bilinguals was weaker than that of the low-proficiency peers in the left anterior cingulated cortex and for inhibition, in the right middle frontal gyrus. For working memory, however, the rsFC showed no difference as a result of proficiency. Finally, the strength of rsFC showed a significant negative correlation with behavioral performance in both bilingual groups. These findings were interpreted within the current debates on bilingualism and cognitive control.

Comparative Study of Degree of Bilingualism in Lexical Retrieval and Language Learning Strategies

This study compares lexical retrieval amongst monolinguals and intermediate bilinguals and advanced bilinguals. It also investigates the possible effects of their language learning strategies on their respective lexical retrieval advantage. The study used a mixed methods design and the groups consisted of 20 Persian near-monolinguals, 20 Persian-English intermediate level bilinguals, and 20 Persian-English high-proficiency bilinguals. Auditory and visual lexical Memory Span Tasks were utilized to evaluate the lexical retrieval of all the language groups. The way that bilinguals used their L2 on a daily basis was examined using semi-structured interviews. It was suggested that the knowledge of two languages will not necessarily result in lexical retrieval advantages in bilinguals when compared to monolinguals. However, it was found that the specific language learning strategies used by the bilinguals could potentially influence their lexical retrieval advantages. Furthermore, when comparing lexical retrieval in different language proficiency groups, the method by which bilinguals manage their two languages as well as the environment they are located in should be taken into consideration.

Lexical selection, cross-language interaction, and switch costs in habitually codeswitching bilinguals

Bilinguals dynamically activate lexical items in one or both languages depending on a number of factors. We explored the interaction effects of semantic constraints, language context, and L2-proficiency on cross-language interaction and switch costs in bilinguals who habitually codeswitch between Algerian Arabic (AA) and French. We recorded response times to French cognates and non-cognates embedded in auditory AA or French sentences. High proficiency bilinguals could restrict selection to the target language regardless of the language context. In lower proficiency bilinguals, however, selection was specific to the target language in non-switching contexts but was nonspecific in switching contexts where cross-language interaction yielded inhibitory and facilitatory cognate effects. Results of this study therefore suggest that lexical selection in codeswitching bilinguals is dynamic and is dependent on proficiency, semantic constraints and language context. This within-subject study using auditory stimuli contributes towards a more ecological methodology in investigating sentence processing in codeswitching bilinguals.

Lexical access in English-Spanish bilinguals

Abstract Does early onset age of language learning in an informal setting always have a long-term advantage? We compared lexical access in adult heritage speakers of Spanish and late learners of Spanish in two word-production tasks, while also considering the speakers’ oral proficiency in their non-dominant language. In all speakers, word recall in the picture-naming task was less accurate and slower than in the translation task. Heritage speakers and late learners of high Spanish proficiency level were different only in the translation task, where learners were faster than heritage speakers, which may be explained by their experience with translation of visual input. These findings suggest that for a non-dominant language, an early onset of learning does not provide an advantage, at least when high-proficiency bilinguals, high-frequency words, and behavioral measures are concerned. Oral proficiency matters most, as it correlates with frequency of language use.

The Pre-attentive L2 Orthographic Perception Mechanism Utilized by Bilinguals with Different Proficiency Levels.

Language proficiency is predicted to modulate orthographic-semantic association in second language (L2) vocabulary acquisition, in accordance with the assumptions of the Developmental Bilingual Interactive-Activation model (BIA-d) (Grainger et al., 2010). The current study explored this modulation during pre-attentive L2 orthographic perception. ERPs were recorded from Chinese–English bilinguals with different L2 proficiency during their pre-attentive response to deviant and standard stimuli arranged in the oddball paradigm. Two stimulus types were investigated separately: L2 orthography and L1 orthography. In the L2 orthography condition, a MMN-N400 complex (i.e., deviancy effect) was found in the high L2 proficiency bilinguals, but only a marginally significant reduced negativity in an early time window was found in the low L2 proficiency bilinguals. In the L1 orthography condition, the high and low L2 proficiency bilinguals showed similar deviancy effect in the form of MMN-P3a-LPC complex. The current findings suggest that proficiency modulates pre-attentive L2 orthographic perception, such that the high L2 proficiency bilinguals activate the associated semantic representation instantly upon orthographic decoding, while the orthographic-semantic connection is not activated for the low L2 proficiency bilinguals. This is probably due to their difference in the strength of orthographic-semantic association. These findings contribute to the understanding of orthographic processing by bilinguals at the pre-attentive level and provide supporting evidence for the BIA-d model.