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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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Profile of language abilities in a sample of adults with developmental disorders
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Profile of language abilities in a sample of adults with developmental disorders
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In: Dyslexia (2020)
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Investigation into inconsistent lateralisation of language functions as a potential risk factor for language impairment
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| 5 |
How does iReadMore therapy change the reading network of patients with central alexia?
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| 6 |
Investigation into inconsistent lateralisation of language functions as a potential risk factor for language impairment
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Auditory training changes temporal lobe connectivity in Wernicke's aphasia: a randomised trial
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Measuring language lateralisation with different language tasks : a systematic review
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| 9 |
The right hemisphere supports but does not replace left hemisphere auditory function in patients with persisting aphasia
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| 10 |
The right hemisphere supports but does not replace left hemisphere auditory function in patients with persisting aphasia
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| 11 |
The right hemisphere supports but does not replace left hemisphere auditory function in patients with persisting aphasia
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