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Related Experiment Video

Updated: May 1, 2026

Creating Virtual-hand and Virtual-face Illusions to Investigate Self-representation
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Crossing the hands increases illusory self-touch.

Polona Pozeg1, Giulio Rognini2, Roy Salomon1

  • 1Center for Neuroprosthetics, School of Life Science, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland; Laboratory of Cognitive Neuroscience, Brain Mind Institute, School of Life Science, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.

Plos One
|April 5, 2014
PubMed
Summary
This summary is machine-generated.

Crossing hands enhances the illusory self-touch in a non-visual rubber hand illusion (RHI) paradigm. This posture may alter tactile-proprioceptive integration, leading to a stronger sense of self-touch without visual input.

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Area of Science:

  • Neuroscience
  • Somatosensory processing
  • Body representation

Background:

  • Hand posture influences spatial representation in the brain.
  • Crossed arms can impair tactile remapping and processing.
  • The rubber hand illusion (RHI) is used to study body representation.

Purpose of the Study:

  • Investigate how crossed hand posture affects illusory self-touch in a non-visual RHI.
  • Determine if hand crossing impacts tactile-proprioceptive integration.
  • Compare effects in non-visual vs. visuo-tactile RHI.

Main Methods:

  • Blindfolded participants performed a non-visual RHI with uncrossed or crossed hands.
  • Illusion strength measured via questionnaire ratings and proprioceptive drift.
  • Controlled for hand position familiarity and location in peripersonal space.

Main Results:

  • Synchronous tactile stimulation with crossed hands significantly increased illusory self-touch strength.
  • This boost was evident in subjective ratings but not proprioceptive drift.
  • Crossed hands did not affect illusion strength in the visuo-tactile RHI.

Conclusions:

  • Crossing hands can enhance illusory self-touch, particularly in non-visual contexts.
  • The effect is linked to somatotopic and external reference frame misalignment.
  • Tactile-proprioceptive integration is re-weighted, influencing self-touch perception.