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Area 55b forms a cortical transition zone for sensorimotor-semantic transformation in human language
Guowei Wu1,2, Xiuyi Wang1,2, Baihan Lyu1,2
1State Key Laboratory of Cognitive Science and Mental Health, Institute of Psychology, Chinese Academy of Sciences, Beijing, China.
Research Square
|June 22, 2026
Summary
Scientists discovered a brain region, area 55b, that acts as the crucial link between language concepts and the brain's sensory and motor systems for both understanding and producing speech.
Area of Science:
- Neuroscience
- Cognitive Science
- Linguistics
Background:
- Human language involves translating abstract concepts into sensorimotor information for perception and action.
- The specific brain regions mediating this sensorimotor-semantic transformation remain largely unknown.
Purpose of the Study:
- To identify the precise cortical interface responsible for transforming amodal concepts into modality-specific sensorimotor systems.
- To investigate how this interface supports both language comprehension and production.
Main Methods:
- Individualized functional magnetic resonance imaging (fMRI) was used to map brain activity during various language tasks (listening, reading, naming, writing).
- Researchers applied five predefined criteria to evaluate the identified lexical network's function as a sensorimotor-semantic interface.
- Effective connectivity analysis was employed to examine dynamic interactions with motor systems.
Main Results:
- Left area 55b was identified as the exclusive sensorimotor-semantic interface for human language.
- Area 55b differentiated between language comprehension and production, showing enhanced semantic representations during production.
- A functional gradient within area 55b was observed, with anterior regions processing semantic information and posterior regions processing articulatory information.
Conclusions:
- Area 55b serves as a critical cortical transition zone, bridging abstract language meaning with perception and action.
- The findings provide a mechanistic explanation for how the brain integrates language with sensory and motor functions.
- This research elucidates the neural basis of sensorimotor-semantic transformations in the human brain.
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