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Related Experiment Video

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Creating Virtual-hand and Virtual-face Illusions to Investigate Self-representation
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The Marble-Hand Illusion.

Irene Senna1, Angelo Maravita2, Nadia Bolognini3

  • 1Faculty of Psychology, Milano-Bicocca University, Milan, Italy; Cognitive Neuroscience Department and Cognitive Interaction Technology-Center of Excellence, Bielefeld University, Bielefeld, Germany.

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|March 14, 2014
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Summary
This summary is machine-generated.

Humans can experience a bodily illusion where their hand feels harder and heavier after multisensory integration. This

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Area of Science:

  • Neuroscience
  • Psychology
  • Sensory Perception

Background:

  • Our sense of the body's material properties is generally stable.
  • Multisensory integration typically reinforces our understanding of the physical self.

Purpose of the Study:

  • To investigate if multisensory experiences can alter the perceived material qualities of the human body.
  • To demonstrate a novel bodily illusion affecting hand material perception.

Main Methods:

  • Participants' hands were repeatedly tapped, with natural impact sounds gradually replaced by marble impact sounds.
  • Perceptual reports of hand properties and Galvanic Skin Response (GSR) were measured.
  • Experiments controlled for audio-tactile synchrony to isolate the effect of sound material information.

Main Results:

  • Participants perceived their hands as stiffer, heavier, harder, and less sensitive after the manipulation.
  • Enhanced GSR to threatening stimuli correlated with perceived hand stiffness.
  • Temporal correlation between sound and touch was necessary for the illusion; mere synchrony was insufficient.

Conclusions:

  • The 'Marble-Hand Illusion' shows that perceived bodily material can be rapidly updated via multisensory integration.
  • Auditory information about impact material significantly influences tactile perception of the body.
  • The stability of bodily self-perception is more malleable than previously assumed.