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Body ownership: When feeling and knowing diverge
Institution:1. Pain and Integrative Neuroscience Branch, National Center for Complementary and Integrative Health, Bethesda, MD, United States;2. Center for Neuroprosthetics, Laboratory of Cognitive Neuroscience, Brain-Mind Institute, École Polytechnique Fédérale de Lausanne-EPFL, Lausanne, Switzerland;3. Department of Psychiatry, University Hospital Geneva, Geneva, Switzerland;4. Department of Neurology, University Hospital Geneva, Geneva, Switzerland;5. Laboratoire de Psychologie et Neurocognition, LPNC CNRS 5105, Université Grenoble Alpes, France
Abstract:Individuals with the peculiar disturbance of ‘overcompleteness’ experience an intense desire to amputate one of their healthy limbs, describing a sense of disownership for it (Body Integrity Identity Disorder – BIID). This condition is similar to somatoparaphrenia, the acquired delusion that one’s own limb belongs to someone else. In ten individuals with BIID, we measured skin conductance response to noxious stimuli, delivered to the accepted and non-accepted limb, touching the body part or simulating the contact (stimuli approach the body without contacting it), hypothesizing that these individuals have responses like somatoparaphrenic patients, who previously showed reduced pain anticipation, when the threat was directed to the disowned limb. We found reduced anticipatory response to stimuli approaching, but not contacting, the unwanted limb. Conversely, stimuli contacting the non-accepted body-part, induced stronger SCR than those contacting the healthy parts, suggesting that feeling of ownership is critically related to a proper processing of incoming threats.
Keywords:Ownership  Self consciousness  Body representation  BIID  Xenomelia  Pain anticipation  Body  Somatoparaphrenia  Consciousness  Self awareness
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