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Transcranial Direct Current Stimulation Effects on Semantic Processing in Healthy Individuals.

Marilyne Joyal1, Shirley Fecteau1

  • 1Centre interdisciplinaire de recherche en réadaptation et en intégration sociale, 525, Boul. Wilfrid-Hamel, Bureau H-1312, Québec (QC), Canada, G1M 2S8; Centre de recherche de l'Institut universitaire en santé mentale de Québec, 2601, de la Canardière, Québec (QC), Canada, G1J 2G3; Faculté de médecine, Université Laval, 1050, avenue de la Médecine, Québec (QC), Canada, G1V 0A6.

Brain Stimulation
|June 12, 2016
PubMed
Summary

Transcranial direct current stimulation (tDCS) can influence semantic processing, which involves using conceptual knowledge. This review of 27 studies suggests that tDCS impacts brain regions like the frontal, temporal, and parietal cortices.

Keywords:
LanguageSemantic processingTranscranial direct current stimulation (tDCS)

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Area of Science:

  • Neuroscience
  • Cognitive Science

Background:

  • Semantic processing relies on conceptual knowledge and involves a distributed neural network including frontal, temporal, and parietal cortices.
  • Transcranial direct current stimulation (tDCS) is increasingly used to investigate the neural underpinnings of semantic processing.

Purpose of the Study:

  • To review studies examining the effects of tDCS on semantic processing in healthy individuals.
  • To correlate tDCS findings with neuroimaging results, predicting impacts on specific brain regions (inferior frontal gyrus, middle temporal gyrus, posterior parietal cortex).

Main Methods:

  • Systematic literature search on PubMed, selecting 27 relevant articles.
  • Analysis of selected studies based on participant demographics, semantic processing outcomes, study design, and tDCS effects.

Main Results:

  • Eight of the 27 reviewed studies found significant main effects of tDCS on semantic processing.
  • Seventeen studies reported interactions between stimulus types and tDCS conditions, indicating modulation of semantic task performance.
  • Findings support the involvement of frontal, temporal, and parietal cortices in semantic processing.

Conclusions:

  • tDCS is a viable tool for modulating semantic processing.
  • tDCS research provides valuable insights into the functional roles of specific brain regions within the semantic network.