Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/49266
Title: Extending body space in immersive virtual reality: a very long arm illusion
Author: Kilteni, Konstantina
Normand, Jean-Marie
Sánchez-Vives, María Victoria
Slater, Mel
Keywords: Realitat virtual
Simulació per ordinador
Virtual reality
Computer simulation
Issue Date: 19-Jul-2012
Publisher: Public Library of Science (PLoS)
Abstract: Recent studies have shown that a fake body part can be incorporated into human body representation through synchronous multisensory stimulation on the fake and corresponding real body part- the most famous example being the Rubber Hand Illusion. However, the extent to which gross asymmetries in the fake body can be assimilated remains unknown. Participants experienced, through a head-tracked stereo head-mounted display a virtual body coincident with their real body. There were 5 conditions in a between-groups experiment, with 10 participants per condition. In all conditions there was visuo-motor congruence between the real and virtual dominant arm. In an Incongruent condition (I), where the virtual arm length was equal to the real length, there was visuo-tactile incongruence. In four Congruent conditions there was visuo-tactile congruence, but the virtual arm lengths were either equal to (C1), double (C2), triple (C3) or quadruple (C4) the real ones. Questionnaire scores and defensive withdrawal movements in response to a threat showed that the overall level of ownership was high in both C1 and I, and there was no significant difference between these conditions. Additionally, participants experienced ownership over the virtual arm up to three times the length of the real one, and less strongly at four times the length. The illusion did decline, however, with the length of the virtual arm. In the C2-C4 conditions although a measure of proprioceptive drift positively correlated with virtual arm length, there was no correlation between the drift and ownership of the virtual arm, suggesting different underlying mechanisms between ownership and drift. Overall, these findings extend and enrich previous results that multisensory and sensorimotor information can reconstruct our perception of the body shape, size and symmetry even when this is not consistent with normal body proportions.
Note: Reproducció del document publicat a: http://dx.doi.org/10.1371/journal.pone.0040867
It is part of: PLoS One, 2012, vol. 7, num. 7, p. e40867
Related resource: http://dx.doi.org/10.1371/journal.pone.0040867
URI: http://hdl.handle.net/2445/49266
ISSN: 1932-6203
Appears in Collections:Articles publicats en revistes (Psicologia Clínica i Psicobiologia)

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