Body visual discontinuity affects feeling of ownership and skin conductance responses

Tieri, Gaetano; Tidoni, Emmanuele; Pavone, Enea Francesco; Aglioti, Salvatore Maria

Abstract

When we look at our hands we are immediately aware that they belong to us and we rarely doubt about the integrity, continuity and sense of ownership of our bodies. Here we explored whether the mere manipulation of the visual appearance of a virtual limb could influence the subjective feeling of ownership and the physiological responses (Skin Conductance Responses, SCRs) associated to a threatening stimulus approaching the virtual hand. Participants observed in first person perspective a virtual body having the right hand-forearm (i) connected by a normal wrist (Full-Limb) or a thin rigid wire connection (Wire) or (ii) disconnected because of a missing wrist (m-Wrist) or a missing wrist plus a plexiglass panel positioned between the hand and the forearm (Plexiglass). While the analysis of subjective ratings revealed that only the observation of natural full connected virtual limb elicited high levels of ownership, high amplitudes of SCRs were found also during observation of the non-natural, rigid wire connection condition. This result suggests that the conscious embodiment of an artificial limb requires a natural looking visual body appearance while implicit reactivity to threat may require physical body continuity, even non-naturally looking, that allows the implementation of protective reactions to threat.

Citation

Tieri, G., Tidoni, E., Pavone, E. F., & Aglioti, S. M. (2015). Body visual discontinuity affects feeling of ownership and skin conductance responses. Scientific reports, 5(1), Article 17139. https://doi.org/10.1038/srep17139

• Journal Article Type: Article
• Acceptance Date: Oct 26, 2015
• Online Publication Date: Nov 25, 2015
• Publication Date: Nov 25, 2015
• Deposit Date: Mar 24, 2019
• Publicly Available Date: Mar 25, 2019
• Journal: Scientific Reports
• Print ISSN: 2045-2322
• Publisher: Nature Publishing Group
• Peer Reviewed: Peer Reviewed
• Volume: 5
• Issue: 1
• Article Number: 17139
• DOI: https://doi.org/10.1038/srep17139
• Keywords: Human behaviour; Sensory processing
• Public URL: https://hull-repository.worktribe.com/output/1420778
• Contract Date: Mar 25, 2019