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Cerebral lateralisation of first and second languages in bilinguals assessed using functional transcranial Doppler ultrasound
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Cerebral lateralisation of first and second languages in bilinguals assessed using functional transcranial Doppler ultrasound
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In: Wellcome Open Res (2021)
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Abstract:
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.
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Keyword:
Research Article
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URL: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8361806/ https://doi.org/10.12688/wellcomeopenres.9869.2 http://www.ncbi.nlm.nih.gov/pubmed/34405116
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Deaf readers benefit from lexical feedback during orthographic processing
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Cerebral lateralisation during signed and spoken language production in children born deaf
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Evidence for shared conceptual representations for sign and speech
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Sign and Speech Share Partially Overlapping Conceptual Representations
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Sign and Speech Share Partially Overlapping Conceptual Representations
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Cerebral lateralisation during signed and spoken language production in children born deaf
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Deaf readers benefit from lexical feedback during orthographic processing
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Sign and Speech Share Partially Overlapping Conceptual Representations
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In: Brain and Mind Institute Researchers' Publications (2019)
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Early use of phonological codes in deaf readers: An ERP study
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LSE-Sign: A lexical database for Spanish Sign Language
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In: ISSN: 1554-351X ; EISSN: 1554-3528 ; Behavior Research Methods ; https://hal.archives-ouvertes.fr/hal-01432250 ; Behavior Research Methods, Psychonomic Society, Inc, 2016, 48 (1), pp.123-137. ⟨10.3758/s13428-014-0560-1⟩ (2016)
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Examining the contribution of motor movement and language dominance to increased left lateralization during sign generation in native signers
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Investigating language lateralization during phonological and semantic fluency tasks using functional transcranial Doppler sonography
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Language lateralization of hearing native signers: A functional transcranial Doppler sonography (fTCD) study of speech and sign production
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Stimulus rate increases lateralisation in linguistic and non-linguistic tasks measured by functional transcranial Doppler sonography
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Language lateralization of hearing native signers: A functional transcranial Doppler sonography (fTCD) study of speech and sign production
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Investigating language lateralization during phonological and semantic fluency tasks using functional transcranial Doppler sonography
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