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Effects of anodal tDCS on resting state eeg power and motor function in acute stroke: a randomized controlled trial.

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Related Experiment Video

Updated: Jun 13, 2026

Randomized, Triple-Blind, and Parallel-Controlled Trial of Transcranial Direct Current Stimulation for Cognitive Rehabilitation after Stroke
08:53

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Published on: June 6, 2025

Brain Activity Changes Induced by Transcranial Direct Current Stimulation in Post-Stroke Motor Recovery: A Narrative

Irin Apiworajirawit1, Wanalee Klomjai1, Thatchaya Prathum1

  • 1Faculty of Physical Therapy, Neuro Electrical Stimulation Laboratory (NeuE), Mahidol University, Nakhon Pathom, Thailand.

Clinical EEG and Neuroscience
|June 12, 2026
PubMed
Summary

This review shows that specific transcranial direct current stimulation (tDCS) methods, like ipsilesional anodal and bilateral M1, may enhance brain activity for stroke motor recovery. Standardized electroencephalography (EEG) analysis is needed for future guidelines.

Keywords:
brain activityelectroencephalographyevent-related brain responsestroketranscranial direct current stimulation

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Area of Science:

  • Neuroscience
  • Rehabilitation Medicine
  • Biomedical Engineering

Background:

  • Electroencephalography (EEG) measures brain activity via power spectral density (PSD), functional connectivity, brain symmetry index (BSI), and event-related responses.
  • Transcranial direct current stimulation (tDCS) is used in post-stroke motor rehabilitation with various montages (e.g., ipsilesional anodal, contralesional cathodal, bilateral M1).
  • A comprehensive review of EEG-derived neurophysiological responses linked to tDCS-assisted motor recovery is lacking.

Purpose of the Study:

  • To comprehensively review EEG-derived neurophysiological responses associated with motor recovery following tDCS in stroke patients.
  • To analyze findings from studies investigating tDCS effects on brain activity, both alone and combined with rehabilitation.
  • To identify trends and inconsistencies in EEG measures related to different tDCS montages and their impact on motor function.

Main Methods:

  • A PubMed search (2000-2025) identified 15 studies: 12 on tDCS and oscillatory activity, 3 on tDCS and event-related brain responses.
  • Studies were categorized based on whether tDCS was administered alone (5 studies) or with rehabilitation (10 studies).
  • EEG measures analyzed included PSD, functional connectivity, BSI, and event-related desynchronization (ERD).

Main Results:

  • For tDCS alone, ipsilesional anodal and bilateral M1 stimulation showed trends toward enhanced high-frequency power and functional connectivity.
  • Contralesional cathodal stimulation tended to decrease beta band connectivity.
  • Combined with rehabilitation, ipsilesional anodal stimulation consistently showed increased high-frequency activity (BSI, ERD) linked to motor improvement; bilateral M1 stimulation also showed ERD enhancements.

Conclusions:

  • Current evidence suggests ipsilesional anodal and bilateral M1 tDCS may enhance high-frequency brain activity in stroke survivors.
  • Inconsistent findings may stem from heterogeneity in EEG analytical methods.
  • Future systematic studies with standardized EEG analyses and clinical outcomes are crucial for developing EEG-based guidelines for tDCS in stroke rehabilitation.