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Decoding verbal working memory representations of Chinese characters from Broca's area.
Chang Yan1, Thomas B Christophel1, Carsten Allefeld2
1Bernstein Center for Computational Neuroscience and Berlin Center for Advanced Neuroimaging and Clinic for Neurology, Charité Universitätsmedizin, Corporate Member of Freie Universität Berlin, Humboldt Universität zu Berlin, and Berlin Institute of Health, Berlin 10115, Germany.
Neuroimage
|November 28, 2020
Summary
This study reveals that Broca's area and the left premotor cortex are crucial for retaining verbal working memory (VWM) by processing Chinese characters. These language-related regions show distinct activity patterns during memory tasks.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Psycholinguistics
Background:
- Sensory working memory representations are widespread across the neocortex.
- The neural mechanisms for retaining verbal working memory (VWM) remain incompletely understood.
- Chinese characters offer a unique model for studying VWM due to their visual complexity and monosyllabic nature, encouraging verbal encoding.
Purpose of the Study:
- To investigate the brain regions involved in the retention of verbal working memory contents.
- To examine how information about memorized Chinese characters is represented in the brain.
- To differentiate the roles of language-related areas versus early visual cortex in VWM.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was employed to monitor brain activity.
- Multi-voxel pattern analysis (MVPA) was utilized to decode information from brain activity patterns.
- Participants (N=28) were native Chinese speakers who memorized Chinese characters during the fMRI scan.
Main Results:
- Activity patterns in Broca's area and the left premotor cortex carried significant information about memorized Chinese characters.
- These language-related regions showed higher information content for cued versus uncued characters and for Chinese symbols compared to non-verbalizable visual patterns.
- Information content was greater in the left than the right hemisphere within these language-related areas.
- Early visual cortex did not show differential information content for cued versus uncued stimuli, suggesting limited involvement in VWM retention.
Conclusions:
- Verbal working memory maintenance involves a distributed network of language-related brain regions.
- Broca's area and the left premotor cortex constitute an articulatory network essential for articulatory rehearsal in VWM.
- The findings support distributed models of working memory and highlight the role of language-specific areas in verbal memory.
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