scholarly journals Self-Body Recognition through a Mirror: Easing Spatial-Consistency Requirements for Rubber Hand Illusion

Psych ◽  
2020 ◽  
Vol 2 (2) ◽  
pp. 114-127
Author(s):  
Hikaru Hasegawa ◽  
Shogo Okamoto ◽  
Ken Itoh ◽  
Masayuki Hara ◽  
Noriaki Kanayama ◽  
...  
Keyword(s):  
Visual Cues ◽  
Mirror Image ◽  
Rubber Hand Illusion ◽  
Main Experiment ◽  
Rubber Hand ◽  
Subjective Evaluations ◽  
Screening Experiment ◽  
Spatial Consistency ◽  
Body Recognition ◽  
Spatial Recognition

Considering that humans recognize mirror images as copies of the real world despite misinterpreting optical reflections, spatial disagreement may be accepted in rubber hand illusion (RHI) settings when a mirror is used to show a fake hand. The present study performed two experiments to reveal how self-body recognition of a fake hand via a mirror affects RHI. First, we tested whether illusory ownership of a fake hand seen in a mirror could be induced in our experimental environment (screening experiment). Subjective evaluations using an RHI questionnaire demonstrated that embodiment of the rubber hand was evoked in the presence or absence of a mirror. We then examined whether using a mirror image for RHI allows disagreement in orientation (45 ∘ ) between the rubber and actual hands (main experiment). The participants experienced RHI even when the actual and rubber hands were incongruent in terms of orientation. These findings suggest that using a mirror masks subtle spatial incongruency or degrades the contribution of visual cues for spatial recognition and facilitates multisensory integration for bodily illusions.

scholarly journals Self-body recognition through a mirror: Easing spatial-consistency requirements for rubber hand illusion

2019 ◽  
Author(s):  
Hikaru Hasegawa ◽  
Shogo Okamoto ◽  
Ken Ito ◽  
Masayuki Hara ◽  
Noriaki Kanayama ◽  
...  
Keyword(s):  
Visual Cues ◽  
Mirror Image ◽  
Rubber Hand Illusion ◽  
Body Ownership ◽  
Rubber Hand ◽  
Subjective Evaluations ◽  
Spatial Consistency ◽  
Tactile Stimuli ◽  
Significant Difference ◽  
Body Recognition

AbstractTypical experiments to induce the rubber hand illusion (RHI) require experimental participants to gaze at a fake hand while tactile stimuli are provided to both the fake and hidden actual hands in a synchronous manner. However, under such conditions, postural and apparent disagreement between a seen fake hand and hidden actual hand prevents illusory body ownership. Provided that humans recognize mirror images as copies of the real world in spite of their spatial uncertainties or incongruence, the sensory disagreement may be accepted in RHI settings if using a mirror to show a fake hand. The present study performed two experiments to reveal how self-body recognition of a fake hand feature via mirror affects the RHI. These experiments were conducted in an RHI environment involving voluntary hand movements to investigate not only body ownership but also agency. The first experiment (Experiment 1) examined whether illusory ownership of a fake hand seen in a mirror could be induced. Then, we examined whether the RHI using a mirror image allows disagreement in orientation between the rubber and actual hands (Experiment 2). Subjective evaluations using a RHI questionnaire demonstrated that evoked embodiment of the rubber hand was stronger in the presence of a mirror than in the absence of it (Experiment 1) and that participants experienced the RHI even if the actual and rubber hands were incongruent in terms of orientation (45 °; Experiment 2). No significant difference was found in the change of perceived finger location (proprioceptive drift) between these experiments. These findings suggest that the use of a mirror masks subtle spatial incongruency or degrades the contribution of visual cues for spatial recognition and facilitates multisensory integration for bodily illusions.

Auditory cues influence the rubber-hand illusion.

2018 ◽  
Vol 44 (7) ◽  
pp. 1012-1021 ◽  
Author(s):  
Dominika Radziun ◽  
H. Henrik Ehrsson
Keyword(s):  
Rubber Hand Illusion ◽  
Rubber Hand ◽  
Auditory Cues

Causal Dynamics of Scalp Electroencephalography Oscillation During the Rubber Hand Illusion

2016 ◽  
Vol 30 (1) ◽  
pp. 122-135 ◽  
Author(s):  
Noriaki Kanayama ◽  
Alberto Morandi ◽  
Kazuo Hiraki ◽  
Francesco Pavani
Keyword(s):  
Rubber Hand Illusion ◽  
Rubber Hand

scholarly journals The rubber hand illusion induced by visual-thermal stimulation

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Jörg Trojan ◽  
Xaver Fuchs ◽  
Sophie-Louise Speth ◽  
Martin Diers
Keyword(s):  
Thermal Stimulation ◽  
Rubber Hand Illusion ◽  
Rubber Hand

scholarly journals Dissociation of feeling and belief in the rubber hand illusion

PLoS ONE ◽  
2018 ◽  
Vol 13 (10) ◽  
pp. e0206367 ◽  
Author(s):  
Luigi Tamè ◽  
Sally A. Linkenauger ◽  
Matthew R. Longo
Keyword(s):  
Rubber Hand Illusion ◽  
Rubber Hand

scholarly journals Age-related changes in the sense of body ownership: New insights from the rubber hand illusion

PLoS ONE ◽  
2018 ◽  
Vol 13 (11) ◽  
pp. e0207528 ◽  
Author(s):  
Angela Marotta ◽  
Massimiliano Zampini ◽  
Michele Tinazzi ◽  
Mirta Fiorio
Keyword(s):  
Rubber Hand Illusion ◽  
Body Ownership ◽  
Rubber Hand ◽  
Age Related ◽  
Age Related Changes

scholarly journals Subjective embodiment during the rubber hand illusion predicts severity of premonitory sensations and tics in Tourette Syndrome

2018 ◽  
Author(s):  
Charlotte Rae ◽  
Dennis Larsson ◽  
Jessica Eccles ◽  
Jamie Ward ◽  
HUgo Critchley
Keyword(s):  
Tourette Syndrome ◽  
Prediction Error ◽  
Tactile Stimulation ◽  
Self Control ◽  
Rubber Hand Illusion ◽  
Neural Pathways ◽  
Rubber Hand ◽  
Artificial Hand ◽  
Error Index ◽  
Proprioceptive Drift

The rubber hand illusion describes a sense of embodiment over a fake hand induced by synchronous visuo-tactile stimulation. In Tourette Syndrome, the expression of involuntary tics and preceding premonitory sensations is associated with the perturbation of subjective feelings of self-control and agency. We compared responses to induction of the Rubber Hand Illusion in 23 adults with TS and 22 matched controls. Both TS and control participants reported equivalent subjective embodiment of the artificial hand: feelings of ownership, location, and agency were greater during synchronous visuo-tactile stimulation, compared to asynchronous stimulation. However, individuals with TS did not manifest greater proprioceptive drift during synchronous relative to asynchronous stimulation, an objective marker of embodiment observed in controls. We computed an ‘embodiment prediction error’ index from the difference between subjective embodiment and objective proprioceptive drift. This embodiment prediction error correlated with severity of premonitory sensations according to the Premonitory Urge for Tics Scale (PUTS). Feelings of ownership over the artificial hand also correlated with premonitory sensation severity, and feelings of agency with tic severity (YGTSS). Together our findings suggest that the subjective strength of bodily ownership, as measured by the rubber hand illusion, contributes to susceptibility to the premonitory sensations that are a precipitating factor in tics. These results also suggest that somatosensory neural pathways underpinning visuo-tactile integration are likely altered in TS and may interact with other sensory and motor systems to engender premonitory sensations and tics.

scholarly journals Virtual limbs and body space: The effects of the rubber hand illusion

2010 ◽  
Vol 8 (6) ◽  
pp. 1049-1049
Author(s):  
F. Short ◽  
R. Ward
Keyword(s):  
Rubber Hand Illusion ◽  
Rubber Hand
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