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Related Experiment Video

Updated: Aug 12, 2025

Effects of Transcranial Alternating Current Stimulation on the Primary Motor Cortex by Online Combined Approach with Transcranial Magnetic Stimulation
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Transcranial Alternating Current Stimulation to Modulate Alpha Activity: A Systematic Review.

Beatrice P De Koninck1, Daphnée Brazeau1, Samuel Guay1

  • 1Sports and Trauma Applied Research Lab, Montreal Sacred Heart Hospital, CIUSSS North-Montreal-Island, Montreal, Quebec, Canada; University of Montreal, Montréal, Quebec, Canada.

Neuromodulation : Journal of the International Neuromodulation Society
|February 1, 2023
PubMed
Summary

Transcranial alternating current stimulation (tACS) shows potential for modulating alpha brain power, though results vary. Further research is needed to standardize parameters and reduce bias for clinical applications.

Keywords:
Alpha rhythmbrain waveselectric stimulation therapyelectroencephalographytranscranial electrical stimulation

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Area of Science:

  • Neuroscience
  • Brain Stimulation
  • Cognitive Science

Background:

  • Transcranial alternating current stimulation (tACS) is investigated for modulating brain oscillations.
  • Existing research on tACS yields contradictory results and lacks standardization.

Approach:

  • Systematic review assessing tACS potential to modulate alpha spectral power in healthy adults.
  • Included studies used active and sham tACS interventions.
  • Evaluated methodologic parameters, sensations, and adverse effects using Cochrane assessment tool.

Key Points:

  • Most studies (20 included) reported significant alpha-power increases with tACS, whether continuous or intermittent, within or outside the alpha range.
  • Heterogeneity in stimulation parameters was observed.
  • Mild adverse effects were reported; double-blinding proved challenging due to artifacts.

Conclusions:

  • tACS demonstrates potential for modulating brain alpha power, with possible clinical applications for neurological conditions.
  • Standardization of optimal parameters, bias reduction, and improved study quality are crucial for advancing tACS.
  • Further research is necessary to optimize tACS for lasting modulation effects.