Abstract
The virtual-reality full-body illusion paradigm has been suggested to not only trigger the illusory ownership of the avatar's body but also the attitudinal and behavioral components stereotypically associated to that kind of virtual body. In the present study, we investigated whether this was true for stereotypes related to body size: body satisfaction and eating control behavior. Healthy participants underwent the full-body illusion paradigm with an avatar having either a larger or a slimmer body than their own, and were assessed for implicit attitudes towards body image and food calorie content at baseline and after each full-body illusion session. Results showed that the illusion emerged regardless of the avatar's body size, whereas the perceived dimension of the own body size changed according to the avatar's body size (i.e., participants felt to be slimmer after embodying their slim avatar and larger after embodying their large avatar). Crucially, we found that implicit attitudes towards food, but not those towards one's own body, were modulated by the size of the virtual body. Compared to baseline, ownership of a slimmer avatar increased the avoidance of high-calorie food, whereas ownership of a larger avatar did not induce changes. Our findings suggest that the illusory feeling of being slimmer drives also the food-related stereotypes associated with that body size, increasing the regulation of eating behaviors.
Highlights
Body ownership is the non-conceptual and perceptual status that the physical body belongs to oneself [1]
Body Size Estimation Task (BSET): the estimation of the own body size changed according to the avatar's body size
To assess the subjective perception of the own body size, we administered the BSET to each subject before and after the full body illusion paradigm
Summary
Body ownership is the non-conceptual and perceptual status that the physical body belongs to oneself [1]. Researchers have begun to employ a variety of paradigms to manipulate the properties subserving body ownership and examine how and to what extent being aware of one's own body affects human cognition and behavior. A life-sized fake hand is placed in front of the participant congruently with his/her body (i.e., in 1st person perspective), while the corresponding real hand is hidden from the view. When both the fake and real hands are synchronously touched, the illusion arises.
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