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Related Experiment Video

Updated: Jun 19, 2026

High-definition Transcranial Direct Current Stimulation over Right Dorsolateral Prefrontal Cortex to Enhance Metacognitive Sensitivity
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Prefrontal hemodynamic changes produced by anodal direct current stimulation.

A C Merzagora1, G Foffani, I Panyavin

  • 1Neurosignals Group, Hospital Nacional de Parapléjicos, SESCAM, Finca La Peraleda s/n, 45071 Toledo, Spain.

Neuroimage
|October 27, 2009
PubMed
Summary
This summary is machine-generated.

Transcranial direct current stimulation (tDCS) increases blood oxygenation in the brain, as measured by functional near-infrared spectroscopy (fNIRS). This effect, particularly from anodal tDCS, persists for up to 10 minutes post-stimulation.

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Last Updated: Jun 19, 2026

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Neuroimaging

Background:

  • Transcranial direct current stimulation (tDCS) modulates cortical excitability for neurological disorders.
  • Mechanisms of tDCS-induced modulations and their persistence remain unclear.
  • Regional blood flow and metabolism changes can indicate cortical activity variations.

Purpose of the Study:

  • To investigate the effects of tDCS on cortical oxygenation using functional near-infrared spectroscopy (fNIRS).
  • To evaluate the temporal dynamics of tDCS-induced neuromodulation.
  • To validate fNIRS as a tool for monitoring tDCS effects.

Main Methods:

  • Healthy volunteers underwent active or sham tDCS over prefrontal locations for 10 minutes.
  • fNIRS was used to measure cortical oxygenation (HbO2) for 20 minutes post-stimulation.
  • Comparison of fNIRS data between active (anodal/cathodal) and sham tDCS conditions.

Main Results:

  • Anodal tDCS significantly increased oxyhemoglobin (HbO2) concentration compared to sham stimulation.
  • The observed increase in HbO2 persisted for 8-10 minutes after active tDCS cessation.
  • Cathodal tDCS showed a negligible effect on cortical oxygenation.

Conclusions:

  • Anodal tDCS induces measurable changes in cortical oxygenation, supporting its neuromodulatory effects.
  • fNIRS effectively monitors these regional alterations, validating its use in tDCS research.
  • Findings contribute to understanding tDCS mechanisms and its clinical applications.