Related Experiment Videos
Convergent cortical representation of semantic processing in bilinguals
J Illes1, W S Francis, J E Desmond
1Department of Radiology, Stanford University, California 94305-5105, USA.
Brain and Language
|December 22, 1999
Summary
Bilinguals utilize a shared frontal lobe system for processing semantic information in both English and Spanish. This neuroimaging study reveals common neural pathways for semantic analysis across languages in fluent bilingual individuals.
Area of Science:
- Neuroscience
- Cognitive Science
- Psycholinguistics
Background:
- Bilingualism presents a unique model for understanding language processing and neural representation.
- Research suggests that semantic memory, the system for storing word meanings, may be organized differently in bilinguals compared to monolinguals.
Purpose of the Study:
- To investigate whether semantic processes in two languages (English and Spanish) are supported by a common neural system in late-acquired bilinguals.
- To examine the brain regions involved in semantic and nonsemantic decisions for words in both languages.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was employed to measure brain activity.
- Bilingual participants performed semantic and nonsemantic word decisions in both English and Spanish.
Main Results:
- Semantic decisions, compared to nonsemantic decisions, elicited greater activation in left and right frontal regions, particularly the left frontal cortex.
- Brain activation patterns for semantic processing were similar across both English and Spanish.
- No significant differences in activation were observed when directly comparing semantic decisions between the two languages.
Conclusions:
- The findings demonstrate a shared neural system within the frontal lobe for semantic analysis of multiple languages.
- These results support the hypothesis that bilingual individuals access a common semantic system for their languages, irrespective of acquisition order.