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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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Consistent inter-individual differences in susceptibility to bodily illusions.

Sarah A Cutts1, Dorothy M Fragaszy1, Madhur Mangalam2

  • 1Department of Psychology, University of Georgia, Athens, GA 30602, USA.

Consciousness and Cognition
|November 1, 2019
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Summary

Illusory senses of ownership and agency can be induced over prosthetic devices. Sensory stimulation strength was similar across modalities, but ownership and agency illusions were distinct processes.

Keywords:
AgencyBody ownershipRubber finger illusionRubber hand illusionTemporal binding

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Area of Science:

  • Neuroscience
  • Human-Computer Interaction
  • Psychology

Background:

  • Illusory senses of ownership and agency are crucial for embodiment in prosthetic limbs and human-machine interfaces.
  • These illusions allow users to feel a connection to and control over external devices.

Purpose of the Study:

  • To investigate the relationship between illusory ownership and agency.
  • To determine if sensory stimulation modalities affect illusion strength.
  • To explore the distinct underlying neuropsychological processes of ownership and agency.

Main Methods:

  • Forty-eight participants were exposed to four procedures designed to elicit illusory ownership or agency over a rubber hand or finger.
  • Sensory stimulation involved visual, tactile, and kinesthetic modalities.

Main Results:

  • Illusory ownership and agency over the hand correlated with those of the finger.
  • Sensory stimulation across different modalities (visual-tactile, visual-kinesthetic) produced illusions of similar strength.
  • The strengths of ownership and agency illusions were unrelated within individuals.

Conclusions:

  • Distinct neuropsychological processes underlie the senses of ownership and agency.
  • Developing training to enhance these illusions could improve prosthetic and human-machine interface applications.
  • Individual susceptibility to these illusions can vary.