The Rubber Hand Illusion (RHI) is used widely to investigate the multisensory integration mechanisms that support bodily self-consciousness and, more specifically, body ownership and self-location. It has been reported that individuals affected by obesity show anomalous multisensory integration processes. We propose that these obesity-induced changes could lead to an unusual susceptibility to the RHI and anomalous bodily self-experience. To test this hypothesis, we administered a modified version of the RHI (using a picture of the participant's hand) to individuals affected by obesity and participants with a healthy weight. During synchronous and asynchronous stimulation, we compared the subjective experience of the illusion (using a questionnaire) and the effect of the illusion on self-location (i.e., proprioceptive drift). In accordance with the illusion phenomenology, both groups had a comparable subjective illusory experience after the synchronous stimulation. Nevertheless, individuals affected by obesity showed less recalibration of self-location than healthy weight participants. In light of a recent interpretation of the multisensory integration mechanisms that underpin the RHI, our findings suggest that in obesity visuo-tactile integration supporting the subjective experience of the illusion is preserved, whereas visuo-proprioceptive integration for self-location is reduced.
The Virtual Hand Illusion in Obesity : Dissociation Between Multisensory Interactions Supporting Illusory Experience and Self-Location Recalibration / S. Tagini, F. Scarpina, F. Bruni, M. Scacchi, A. Mauro, M. Zampini. - In: MULTISENSORY RESEARCH. - ISSN 2213-4794. - 33:3(2020 Feb), pp. 337-361.
|Titolo:||The Virtual Hand Illusion in Obesity : Dissociation Between Multisensory Interactions Supporting Illusory Experience and Self-Location Recalibration|
|Parole Chiave:||Multisensory integration; bodily self-consciousness; body representation; obesity; rubber hand illusion|
|Settore Scientifico Disciplinare:||Settore MED/13 - Endocrinologia|
|Data di pubblicazione:||feb-2020|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1163/22134808-20191425|
|Appare nelle tipologie:||01 - Articolo su periodico|