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.
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Acknowledgments
Dr. Tsakiris and Dr. Fotopoulou were supported by the European Platform for Life Sciences, Mind Sciences, and the Humanities” grant by the Volkswagen Stiftung for the “Body-Project: interdisciplinary investigations on bodily experiences”. The authors would like to thank Philip Roberts for developing the stimuli.
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Appendix
Appendix
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Ownership statements
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…it seemed like I was looking directly at my own left hand, rather than at an object.
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…it seemed like the object began to resemble my real hand.
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…it seemed like the object belonged to me.
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…it seemed like the object was my left hand
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…it seemed like the object was part of my body.
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Location statements
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…it seemed like I was feeling the touch of the paintbrush in the location where I saw the object touched.
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…it seemed like my left hand was in the location where the object was.
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…it seemed like the object was in the location where my left hand was.
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…it seemed like the touch I felt was caused by the paintbrush touching the object.
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Loss of one’s hand statements
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…it seemed like I was unable to move my left hand.
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…it seemed like I couldn’t really tell where my left hand was.
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…it seemed like my left hand had disappeared.
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…it seemed like my left hand was out of my control.
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Agency statements
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…it seemed like I could have moved my left hand if I had wanted.
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…it seemed like I could have moved the object if I had wanted.
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…it seemed like I was in control of the object.
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Tsakiris, M., Carpenter, L., James, D. et al. Hands only illusion: multisensory integration elicits sense of ownership for body parts but not for non-corporeal objects. Exp Brain Res 204, 343–352 (2010). https://doi.org/10.1007/s00221-009-2039-3
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DOI: https://doi.org/10.1007/s00221-009-2039-3