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Functional anatomy of syntactic and semantic processing in language comprehension
Kang-Kwong Luke1, Ho-Ling Liu, Yo-Yo Wai
1Department of Linguistics, University of Hong Kong, Hong Kong.
Human Brain Mapping
|July 12, 2002
Summary
Functional magnetic resonance imaging (fMRI) reveals that syntactic and semantic language processing in Chinese involves overlapping brain regions. Bilinguals processing English also utilized these Chinese-specific neural systems.
Area of Science:
- Neuroscience
- Psycholinguistics
- Cognitive Science
Background:
- Previous research indicates distinct brain regions for syntactic and semantic processing in monolingual English speakers.
- The neural basis of language processing in bilingual individuals, particularly for languages with different structures like Chinese, requires further investigation.
Purpose of the Study:
- To map syntactic and semantic processing onto the brain using functional magnetic resonance imaging (fMRI) in Chinese-English bilinguals.
- To investigate potential differences in neural activation patterns between Chinese and English language processing.
- To explore the degree of independence between syntactic and semantic processing in the Chinese language.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was employed to observe brain activity.
- Participants performed syntactic plausibility, semantic plausibility, and font size judgment (baseline) tasks.
- Stimuli included Chinese and English phrases presented to bilingual subjects.
Main Results:
- A distributed neural network in the left frontal and temporal cortices was identified for Chinese phrase processing, with some right hemisphere activation but overall left-lateralization.
- Unlike English, syntactic and semantic analyses of Chinese phrases involved overlapping cortical sites.
- Specific areas showed differential activation: left middle frontal cortex for syntax and left inferior prefrontal cortex/mid-superior temporal gyri for semantics.
- Bilinguals processing English phrases utilized the same neural systems engaged during Chinese reading.
Conclusions:
- Syntactic processing appears less independent in Chinese, likely due to the intertwined nature of syntax and semantics in the language.
- Bilingual individuals may recruit language-specific neural networks for their native language when processing a second language.
- These findings highlight the influence of linguistic structure on neural organization for language processing.
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