Visual perception of one’s own body under vestibular stimulation using biometric self-avatars in virtual reality
Hans-Otto Karnath,Hans-Otto Karnath,Simone Claire Mölbert,Simone Claire Mölbert,Anna Katharina Klaner,Joachim Tesch,Katrin Elisabeth Giel,Hong Yu Wong,Betty J. Mohler +8 more
TLDR
The results suggest that vestibular stimulation does not directly influence the explicit somatosensory representation of the authors' body, and multisensory integration and not the processing of a single sensory input is the crucial mechanism in generating their body representation in relation to the external world.Abstract:
Background and purpose
Vestibular input is projected to "multisensory (vestibular) cortex" where it converges with input from other sensory modalities. It has been assumed that this multisensory integration enables a continuous perception of state and presence of one’s own body. The present study thus asked whether or not vestibular stimulation may impact this perception.
Methods
We used an immersive virtual reality setup to realistically manipulate the length of extremities of first person biometric avatars. Twenty-two healthy participants had to adjust arms and legs to their correct length from various start lengths before, during, and after vestibular stimulation.
Results
Neither unilateral caloric nor galvanic vestibular stimulation had a modulating effect on the perceived size of own extremities.
Conclusion
Our results suggest that vestibular stimulation does not directly influence the explicit somatosensory representation of our body. It is possible that in non-brain-damaged, healthy subjects, changes in whole body size perception are principally not mediated by vestibular information. Alternatively, visual feedback and/or memory may dominate multisensory integration and thereby override possibly existing modulations of body perception by vestibular stimulation. The present observations suggest that multisensory integration and not the processing of a single sensory input is the crucial mechanism in generating our body representation in relation to the external world.read more
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References
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The building blocks of the full body ownership illusion
TL;DR: It is found that the illusion of ownership can be generated when the virtual body has a realistic skin tone and spatially substitutes the real body seen from a first person perspective, and the processing of incongruent perceptual cues can be modulated by the level of the illusion.
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Evidence for Multiple, Distinct Representations of the Human Body
John Schwoebel,H. Branch Coslett +1 more
TL;DR: Lesions of the left temporal lobe were most consistently associated with impaired performance on tasks assessing knowledge of the shape or lexical-semantic information about the body, whereas lesions of the dorsolateral frontal and parietal regions resulted in impaired performance in tasks requiring on-line coding of body posture.
Remission of hemineglect andanosognosia during vestibular stimulation
TL;DR: Preliminary findings indicate a possible role of vestibular stimulation on hemispheric activation and neglect phenomena improved in all patients, while an effect on anosognosia was found in two cases.
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Caloric stimulation and unilateral visual neglect
TL;DR: Patients with left-sided visual neglect after strokes improved during caloric stimulation on the left by cold or on the right by warm water, and improvement seemed to depend on the 'facilitation of left lateral gaze and on past-pointing to the left.
Journal ArticleDOI
Remission of hemineglect and anosognosia during vestibular stimulation.
TL;DR: In this paper, the effects of vestibular stimulation on extrapersonal and personal neglect and on awareness of disease were investigated in four patients with severe neglect and anosognosia.
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