4.5 Article

Effects of Transcranial Direct Current Stimulation Over the Left Primary Motor Cortex on Verbal Intelligence

Journal

FRONTIERS IN HUMAN NEUROSCIENCE
Volume 16, Issue -, Pages -

Publisher

FRONTIERS MEDIA SA
DOI: 10.3389/fnhum.2022.888590

Keywords

verbal intelligence; performance intelligence; left primary motor cortex; transcranial direct current stimulation (tDCS); anodal stimulation

Funding

  1. Fundamental Research Funds for the Central Universities
  2. Research Funds of Renmin University of China [21XNA031]

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This study found that transcranial direct current stimulation (tDCS) over the left primary motor cortex has a positive effect on verbal intelligence, but no effect on performance intelligence.
Previous studies have shown that changes in gray matter density and volume in the left primary motor cortex are significantly associated with changes in individuals' verbal intelligence quotient (VIQ), but not with their performance intelligence quotient (PIQ). In the present study, we examined the effects of transcranial direct current stimulation (tDCS) over the left primary motor cortex on performance in intelligence tests. We chose four subtests (two each for VIQ and PIQ) of the Wechsler Adult Intelligence Scale-Chinese Revised version and randomized participants into anodal, cathodal, and sham groups. We found that anodal stimulation significantly improved performance in verbal intelligence subtests compared to cathodal and sham stimulation, while performance intelligence subtest scores did not change in any stimulation condition. These findings suggest that the excitation level of the left primary motor cortex has a unique effect on verbal intelligence.

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