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Higher Mental Functions of the Brain: Language01:10

Higher Mental Functions of the Brain: Language

Language is a system of communication that allows the expression of thoughts, ideas, and feelings. The brain processes language in both hemispheres.
Language formation and comprehension take place in the dominant hemisphere. The dominant hemisphere is responsible for understanding the meaning of spoken, written, or sign language, as well as the ability to communicate. For most people, the left hemisphere is the dominant one. The right hemisphere, then, gives tone and emotional context to the...

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Neuromodulation of prefrontal cortex promotes deep processing during language comprehension: a tDCS/EEG study.

Megan A Boudewyn1, Cameron S Carter2

  • 1Department of Psychology, University of California, 1156 High Street, Santa Cruz, CA, 95064, USA. mboudewyn@ucsc.edu.

Cognitive, Affective & Behavioral Neuroscience
|August 13, 2025
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Summary

Transcranial direct current stimulation (tDCS) of the prefrontal cortex (PFC) enhances language comprehension revision. Heightened PFC stimulation improved detection of thematic role conflicts, suggesting neurocognitive state influences linguistic processing.

Keywords:
EEGLanguage comprehensionN400P600Prefrontal cortexTDCS

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Area of Science:

  • Cognitive Neuroscience
  • Psycholinguistics
  • Neuromodulation

Background:

  • Language comprehension involves complex processes, including revision and updating of meaning representations.
  • The prefrontal cortex (PFC) is hypothesized to play a role in these higher-order linguistic functions.
  • Noninvasive brain stimulation techniques offer a way to investigate the causal role of specific brain regions.

Purpose of the Study:

  • To investigate the contribution of the prefrontal cortex (PFC) to revision and updating during language comprehension.
  • To examine how transcranial direct current stimulation (tDCS) of the PFC affects neural responses during sentence processing.
  • To determine if modulating PFC activity influences the detection and resolution of semantic conflicts in language.

Main Methods:

  • Utilized transcranial direct current stimulation (tDCS) targeting the PFC, with Sham and Active Control conditions.
  • Recorded electroencephalography (EEG) to measure event-related potential (ERP) responses.
  • Participants read sentences with plausible and implausible thematic roles to elicit comprehension conflicts.

Main Results:

  • Sham tDCS resulted in N400 effects, indicating semantic anomaly detection.
  • PFC-targeted tDCS elicited robust P600 effects, signifying conflict detection and revision.
  • Active Control tDCS showed intermediate effects, suggesting some PFC involvement.

Conclusions:

  • Heightened PFC stimulation via tDCS enhances the ability to detect and revise semantic conflicts during language comprehension.
  • Neurocognitive state, modulated by PFC activity, influences within-individual language processing.
  • Findings support theories implicating the PFC in complex revision and updating mechanisms essential for understanding.
  • This study demonstrates a direct link between PFC function and the dynamic processes of language comprehension.