Incongruent multisensory stimuli alter bodily self-consciousness: Evidence from a first-person perspective experience

Valzolgher, Chiara; Mazzurega, Mara; Zampini, Massimiliano; Pavani, Francesco

doi:10.1016/j.actpsy.2018.09.009

Cited by 7 publications

(5 citation statements)

References 48 publications

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“…Participants were asked to estimate their height, and the width and the circumference of three different body parts (shoulders, abdomen, and hips), at three time points: before the VR-FBI, representing the baseline, and after both the two (synchronous and asynchronous) conditions of visuo-tactile stimulation. Moreover, in line with the traditional literature [1,2,3,4,5,6,7,8,9,10,11,12,20,21], we adopted the Embodiment Questionnaire [1]: this questionnaire, administered after both stimulation conditions, allows to measure the strength of illusion in terms of: (1) Ownership over the virtual body; (2) Self-location , i.e., being in the same location of the virtual body; and (3) Sense of agency over the virtual body.…”

Section: Introductionsupporting

confidence: 80%

“…This aspect should be taken in account when a task about the estimation of body parts or whole body is chosen as measure of the illusion. Moreover, it should be noted that in the Body Size Estimation Task [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20], participants are explicitly required to estimate the horizontal distance between the left and right side of each body part placing adhesive stickers on the wall. To avoid that they used their body as a reference for giving a correct body size estimation, we explicitly required participants to do not look at their own body during the task.…”

Section: Discussionmentioning

confidence: 99%

“…The efficacy of the illusory ownership over an artificial body (i.e., body-ownership illusion) as a method for modulating body representations in both healthy such as [1,2,3,4,5,6] and clinical population (such as individuals suffering of eating disorders [7,8], Complex Regional Pain Syndrome [9] and Disturbed Body Integrity [10,11] has been repeatedly reported in recent literature. Indeed, since from the traditional Rubber Hand Illusion [12], it was speculated if bodily illusions might be adopted in therapeutic settings [13,14,15,16,17] for enhancing positive rehabilitative outcomes.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of a Virtual-Reality Full-Body Illusion on Body Representation in Obesity

Scarpina

Serino

Keizer

et al. 2019

JCM

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Background. The effective illusory ownership over an artificial body in modulating body representations in healthy and eating disorders population has been repeatedly reported in recent literature. In this study, we extended this research in the field of obesity: specifically, we investigated whether ownership over a virtual body with a skinny abdomen might be successfully experienced by participants affected by obesity. Methods. Fifteen participants with obesity and fifteen healthy-weight participants took part at this study in which the VR-Full-Body Illusion was adopted. The strength of illusion was investigated through the traditional Embodiment Questionnaire, while changes in bodily experience were measured through a body size estimation task. Results. Participants with obesity as well as healthy-weight participants reported to experience the illusion. About the body size estimation task, both groups reported changes only in the estimation of the abdomen’s circumference after the experimental condition, in absence of any another difference. Discussion. Participants with obesity reported to experience the illusion over a skinny avatar, but the modulation of the bodily experience seems controversial. Future lines of research exploiting this technique for modulating body representations in obesity, specifically in terms of potential therapeutic use, were discussed.

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Section: Introductionsupporting

confidence: 80%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Effect of a Virtual-Reality Full-Body Illusion on Body Representation in Obesity

Scarpina

Serino

Keizer

et al. 2019

JCM

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“…For instance, Projected hand illusion 34,35 uses the videos of participant's own hand that are projected on a table in front of them, either in live timing, or with a delay (which creates asynchronous stimulation). In more immersive setups, such as the MIRAGE system, the videos of the own hand are projected on the same plane as the real hand 18 , or presented in a head-mounted display (HMD) 36,37 . Moreover, other variations of the experimental procedure used augmented- 38 and mixed reality 10 .…”

mentioning

confidence: 99%

Visual appearance of the virtual hand affects embodiment in the virtual hand illusion

Pyasik

Tieri

Pia

2020

Sci Rep

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Body ownership (the feeling that one's body belongs to oneself) is commonly studied with Rubber hand illusion (RHI) paradigm that allows inducing a temporary illusory feeling of ownership of a life-sized rubber hand. However, it remains unclear whether illusory ownership of the fake hand relies on the same mechanisms as ownership of one's own real hand. Here, we directly compared ownership of the own hand (OH) and fake hand (FH) in the same set of conditions within immersive virtual reality. We obtained behavioral (proprioceptive drift) and subjective (questionnaire) measures of ownership and disownership for virtual OH, FH and object (Obj) that were located congruently or incongruently with the participant's real hand and were stimulated synchronously or asynchronously with the real hand. Both OH and FH (but not Obj) were embodied after synchronous stimulation in both locations. Crucially, subjective ownership of the OH was stronger than of the FH in congruent location after synchronous stimulation. It was also present after asynchronous stimulation, being stronger when the virtual OH was subjectively more similar to the real hand. The results suggest that the detailed appearance of the body might act as an additional component in the construction of body ownership.

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“…Moreover, being embodied in full virtual child body can modulate the subsequent real speaking (Tajadura-Jiménez et al, 2017). Five studies investigated the influence of a full virtual body illusion from a 1PP: (1) to induce real body postural discomfort (Bergström et al, 2016); (2) to stimulate some motor responses such as the walking illusion (Kokkinara et al, 2016); (3) for motor errors monitoring (Pavone et al, 2016;Valzolgher et al, 2018); or (4) to incorporate robotic hands into the own body through synchronous VMC controlled by a brain machine interface (Alimardani et al, 2013). Serino and colleagues (2018) observed that there are age related changes when perceiving a virtual FBOI, where participants between 26-to-55-year-old were more resistant to changes induced by the bodily illusion, compared to a young group of people (19-to-25 years old) (S. Serino et al, 2018).…”

Section: Bi To Modulate Body Representation Evidence From Healthymentioning

confidence: 99%

Body illusions for mental health: a systematic review

Matamala-Gomez¹,

Maselli²,

Malighetti³

et al. 2020

Preprint

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Body illusions (BIs) refer to altered perceptual states where the perception of the self-body significantly deviates from the configuration of the physical body, for example, in aspects like perceived size, shape, posture, location, and sense of ownership. Different established experimental paradigms allow to temporarily induce such altered perceptual states in a predictable and systematic manner. There is evidence demonstrating the use of BIs in clinical neuroscience, however, to our knowledge, this is the first systematic review evaluating the effectiveness of BIs in healthy and clinical populations. This systematic review examined the use of BIs in the healthy and clinical populations, and review how BIs can be adopted to enhance mental health in different mental illness conditions. The systematic review was conducted following the PRISMA guidelines. Of the 8086 studies identified, 189 studies were included for full-text analyses. Seventy-seven studies used BIs in clinical populations. Most of the studies using BIs with clinical populations used body illusions toward a body part, modulating the external aspects of body representation. Even though clinical studies showed the positive effects of BIs to improve mental illness conditions, future technologies using BIs targeting both the external (exteroceptive) and the internal (interoceptive) aspects of body representations can further improve the efficacy of this approach.

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Incongruent multisensory stimuli alter bodily self-consciousness: Evidence from a first-person perspective experience

Cited by 7 publications

References 48 publications

The Effect of a Virtual-Reality Full-Body Illusion on Body Representation in Obesity

The Effect of a Virtual-Reality Full-Body Illusion on Body Representation in Obesity

Visual appearance of the virtual hand affects embodiment in the virtual hand illusion

Body illusions for mental health: a systematic review

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