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Related Experiment Video

Updated: Dec 20, 2025

Creating Virtual-hand and Virtual-face Illusions to Investigate Self-representation
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Transcranial Direct Current Stimulation Effect on Virtual Hand Illusion.

Hyunmi Lim1, Won-Seok Kim2, Jeonghun Ku1

  • 1Department of Biomedical Engineering, School of Medicine, Keimyung University, Daegu, Republic of Korea.

Cyberpsychology, Behavior and Social Networking
|June 2, 2020
PubMed
Summary
This summary is machine-generated.

Transcranial direct current stimulation (tDCS) enhances the virtual reality mirror hand illusion (MVHI) by modulating brain activity. This combination of virtual reality and tDCS boosts immersion and may aid in stroke recovery.

Keywords:
mu suppressionproprioceptive drifttranscranial direct current stimulationvirtual hand illusionvirtual reality

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Area of Science:

  • Neuroscience
  • Virtual Reality Technology
  • Human-Computer Interaction

Background:

  • Virtual reality (VR) effectively induces illusions, and transcranial direct current stimulation (tDCS) can enhance these effects.
  • The mirror virtual hand illusion (MVHI) uses VR to create a sense of embodiment with a virtual limb.

Purpose of the Study:

  • To investigate if tDCS applied to the primary motor cortex modulates the MVHI.
  • To explore the neural correlates and subjective experience of tDCS-enhanced MVHI.

Main Methods:

  • Fourteen healthy adults participated in a within-subjects study comparing VR with and without tDCS.
  • Participants experienced an immersive, first-person VR system where their real hand movements controlled a virtual hand.
  • Electroencephalography (EEG), proprioceptive shift measurements, and questionnaires assessed the illusion's magnitude and ownership.

Main Results:

  • tDCS significantly altered the proprioceptive shift compared to sham stimulation.
  • EEG data showed suppressed mu power and augmented beta power in specific brain regions.
  • Participants reported significantly higher hand ownership in the tDCS condition.

Conclusions:

  • tDCS applied to the motor cortex facilitates the MVHI, likely by engaging attentional networks in the parietal and frontal lobes.
  • The combination of VR and tDCS enhances immersive effects, suggesting potential therapeutic applications for conditions like stroke.