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Electrophysiological measures of language processing in bilinguals
Alice Mado Proverbio1, Barbara Cok, Alberto Zani
1Department of Psychology, University of Milano-Bicocca, Italy. mado.proverbio@unimib.it
Journal of Cognitive Neuroscience
|November 7, 2002
Summary
This study reveals how the bilingual brain processes multiple languages, showing distinct hemispheric activations for different languages and error types. These findings highlight brain plasticity in polyglots, independent of acquisition age or fluency.
Area of Science:
- Neuroscience
- Psycholinguistics
- Cognitive Science
Background:
- Understanding how the human brain represents and processes multiple languages is crucial for cognitive science.
- Bilingualism offers a unique model to study brain plasticity and language representation.
Purpose of the Study:
- To investigate the neural representation of multiple languages in the brain using event-related brain potentials (ERPs).
- To compare language processing in monolinguals and highly fluent, early-acquired bilinguals.
Main Methods:
- Recorded ERPs from Italian monolinguals and Italian/Slovenian bilinguals during a silent reading task.
- Participants judged the semantic and syntactic correctness of sentences.
- Stimuli included correctly formed sentences and sentences with semantic or syntactic errors.
Main Results:
- Bilinguals showed left-sided occipitotemporal activation for Slovenian (native language) and bilateral activation for Italian (second language).
- Monolinguals exhibited right-hemisphere dominance for semantic errors and left-hemisphere for syntactic errors.
- Bilinguals displayed left-hemisphere dominance for semantic incongruence and differential hemispheric responses for syntactic errors based on language.
Conclusions:
- Bilingual language comprehension involves inter- and intrahemispheric brain activation asymmetries.
- Early acquisition and high fluency in bilinguals suggest brain activation patterns are shaped by functional organization and plasticity, not solely age or proficiency.
- Findings support the role of brain plasticity in adapting neural networks for polyglotism.