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Updated: Sep 8, 2025

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Exploring semantic grounding in the posterior parietal cortex.

Umberto Quartetti1, Chiara Finocchiaro2, Giuditta Gambino3

  • 1Department of Biomedicine Neuroscience and Advanced Diagnostics, School of Medicine, University of Palermo, Palermo, Italy.

Brain Structure & Function
|June 26, 2025
PubMed
Summary
This summary is machine-generated.

Investigating semantic processing, this study found that repetitive Transcranial Magnetic Stimulation (rTMS) over the right posterior parietal cortex (PPC) impacts spatial language comprehension, suggesting its role in semantic hubs.

Keywords:
Grounded cognitionPosterior parietal cortexSemanticsSpatial processingrTMS

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psycholinguistics

Background:

  • Semantic processing has evolved from isolated systems to dynamic neural networks.
  • Multimodal regions act as integrative "semantic hubs" for semantic processing.
  • The posterior parietal cortices (PPC) are investigated for their role in space-related semantics.

Purpose of the Study:

  • To examine the role of the posterior parietal cortices (PPC) in processing space-related semantics.
  • To investigate the causal contribution of the PPC to semantic processing using repetitive Transcranial Magnetic Stimulation (rTMS).

Main Methods:

  • A low-frequency repetitive Transcranial Magnetic Stimulation (rTMS) protocol was applied to the PPC in 11 healthy participants.
  • Two tasks were employed: word reading and dichotomous question answering involving spatial relations.
  • Stimulation targeted both left and right PPC across different semantic tasks.

Main Results:

  • No significant effects were observed during a word-reading task.
  • rTMS over the right PPC impaired response accuracy for both spatial and non-spatial sentences.
  • rTMS over the right PPC selectively increased reaction times for spatial sentences, but not non-spatial ones.
  • No significant effects were found after left PPC stimulation.

Conclusions:

  • The right PPC plays a role in the semantic processing of space-related words.
  • Findings support the involvement of specific brain regions, like the right PPC, in multimodal semantic hubs.
  • This research contributes to understanding the distributed nature of semantic networks and specialized brain functions.