Research article

Experimental Brain Research

, Volume 204, Issue 3, pp 343-352

First online:

Hands only illusion: multisensory integration elicits sense of ownership for body parts but not for non-corporeal objects

  • Manos TsakirisAffiliated withDepartment of Psychology, Royal Holloway, University of London Email author 
  • , Lewis CarpenterAffiliated withDepartment of Psychology, Royal Holloway, University of London
  • , Dafydd JamesAffiliated withDepartment of Psychology, Royal Holloway, University of London
  • , Aikaterini FotopoulouAffiliated withDepartment of Psychology, Institute of Cognitive Neuroscience, University College London

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Abstract

The experience of body ownership can be successfully manipulated during the rubber hand illusion using synchronous multisensory stimulation. The hypothesis that multisensory integration is both a necessary and sufficient condition for body ownership is debated. We systematically varied the appearance of the object that was stimulated in synchrony or asynchrony with the participant’s hand. A viewed object that was transformed in three stages from a plain wooden block to a wooden hand was compared to a realistic rubber hand. Introspective and behavioural results show that participants experience a sense of ownership only for the realistic prosthetic hand, suggesting that not all objects can be experienced as part of one’s body. Instead, the viewed object must fit with a reference model of the body that contains important structural information about body parts. This body model can distinguish between corporeal and non-corporeal objects, and it therefore plays a critical role in maintaining a coherent sense of one’s body.

Keywords

Rubber hand illusion Body ownership Multisensory integration Body model Body representations