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Manipulation of Human Verticality Using High-Definition Transcranial Direct Current Stimulation.

Taiza E G Santos1, Diandra B Favoretto1, Iman Ghodratti Toostani2,3

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Summary
This summary is machine-generated.

High-definition transcranial direct current stimulation (HD-tDCS) over the temporo-parietal junction modulates visual and postural control. This study establishes dose-response effects for potential clinical applications.

Keywords:
electroencephalographyhigh-definition transcranial direct current stimulationpostural controltemporo-parietal junctionverticality

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Area of Science:

  • Neuroscience
  • Neuromodulation
  • Clinical Trials

Background:

  • Conventional transcranial direct current stimulation (tDCS) can alter subjective visual vertical (SVV) and postural control.
  • High-definition tDCS (HD-tDCS) offers improved cortical stimulation focality compared to conventional tDCS.
  • Establishing dose-response effects for HD-tDCS is crucial for clinical relevance.

Purpose of the Study:

  • Investigate polarity and intensity-dependent effects of HD-tDCS on the right temporo-parietal junction (TPJ).
  • Assess behavioral (SVV, weight-bearing asymmetry) and physiological (EEG-PSD) outcomes.
  • Determine the feasibility, safety, and tolerability of the HD-tDCS protocol.

Main Methods:

  • Three randomized, double-blind, crossover phase I clinical trials in healthy adults.
  • HD-tDCS3x1 montage over the right TPJ.
  • Tested 1, 2, and 3 mA intensities with anode center, cathode center, or sham stimulation.

Main Results:

  • Significant SVV deviation observed with cathode center stimulation, increasing with intensity.
  • Significant weight-bearing asymmetry (WBA) dependent on stimulation polarity.
  • Increased gamma band EEG power spectral density (PSD) at 3 mA under cathode stimulation.

Conclusions:

  • Converging evidence supports focal neuromodulation via HD-tDCS over the right TPJ.
  • Modulation of physiology and behavior has potential clinical applications.
  • The tested HD-tDCS protocol is feasible, safe, and tolerable.