Phonological processing in Chinese-English bilingual biscriptals: an fMRI study

Area of Science:

• Neuroscience
• Cognitive Science
• Psycholinguistics

Background:

• Previous research on language processing in bilinguals has shown varied activation patterns, particularly between alphabetic languages.
• Existing neuroimaging studies on Mandarin-English bilinguals often suggest common neural substrates for both languages, despite their contrasting forms.
• The specific neural correlates of phonological processing in English-Chinese biscriptal readers remain underexplored.

Purpose of the Study:

• To investigate the phonological processes involved in reading for individuals bilingual in English and Mandarin Chinese (biscriptals).
• To compare the neural activation patterns for English and Mandarin reading within the same bilingual individuals.
• To examine whether distinct or common neural substrates support the processing of these two languages with contrasting scripts.

Main Methods:

• A homophone matching task was employed to probe phonological processing.
• Parallel behavioral (n=28) and functional Magnetic Resonance Imaging (fMRI) (n=6) experiments were conducted.
• fMRI data were analyzed to identify distinct brain regions activated during Mandarin and English reading.

Main Results:

• Distinct patterns of brain activation were observed for Mandarin and English reading.
• Mandarin processing involved activation in the left and right frontal lobes, left temporal lobe, and right occipital lobe.
• English processing showed bilateral activation in the frontal and parietal lobes.

Conclusions:

• The findings challenge the notion of entirely common neural substrates for processing English and Mandarin in bilinguals.
• Novel distinct activation regions for each language suggest specialized neural networks for processing contrasting scripts.
• These results have significant implications for understanding language representation and neural plasticity in bilingual individuals.