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HD-tDCS over motor cortex facilitates figurative and literal action sentence processing
Karim Johari1, Nicholas Riccardi2, Svetlana Malyutina3
1Human Brain Mapping Laboratory, Department of Neurosurgery, University of Iowa, Iowa City, IA, USA; Department of Psychology, University of South Carolina, Columbia, SC, USA.
Neuropsychologia
|July 12, 2021
Summary
The brain's motor cortex aids understanding action sentences, even when language is figurative. This research confirms motor system involvement in processing both literal and metaphorical action language.
Area of Science:
- Neuroscience
- Cognitive Science
- Psycholinguistics
Background:
- The role of sensory-motor systems in semantic comprehension, particularly for figurative language, is debated.
- Understanding whether the brain's action and perception systems are engaged during language processing is crucial.
Purpose of the Study:
- To investigate the involvement of the left-hemisphere motor cortex in comprehending action sentences.
- To determine if figurative language (metaphors, idioms) processing relies on motor cortex activation.
Main Methods:
- Utilized high-definition transcranial direct current stimulation (HD-tDCS) on healthy adults.
- Compared comprehension of literal, metaphoric, and idiomatic action sentences against visual verb sentences.
- Measured response times to assess processing facilitation or interference.
Main Results:
- Action sentence comprehension was facilitated compared to visual sentences.
- HD-tDCS on the motor cortex showed significant interaction effects for all action sentence types (literal, metaphoric, idiomatic).
- These findings indicate motor cortex engagement across different uses of action verbs.
Conclusions:
- The left motor cortex is functionally involved in comprehending action sentences.
- This motor cortex involvement extends to figurative language, including metaphors and idioms.
- Evidence supports functional connections between the brain's conceptual and action systems.
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