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  The plasticity of the bodily self: Head movements in bodily illusions and their relation to gallagher's body image and body schema

Lesur, M. R., Gaebler, M., Bertrand, P., & Lenggenhager, B. (2018). The plasticity of the bodily self: Head movements in bodily illusions and their relation to gallagher's body image and body schema. Constructivist Foundations, 14(1), 94-105. doi:10.5167/uzh-162795.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-92AD-6 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-9381-4
Genre: Journal Article

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 Creators:
Lesur , Marte Roel 1, Author
Gaebler, Michael2, Author              
Bertrand , Philippe 3, Author
Lenggenhager , Bigna 1, Author
Affiliations:
1University of Zurich, Switzerland, ou_persistent22              
2Department Neurology, MPI for Human Cognitive and Brain Sciences, Max Planck Society, ou_634549              
3Université Paris Descartes, France, ou_persistent22              

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Free keywords: Bodily illusions; Bodily self; Body image; Body schema; Sensorimotor integration
 Abstract: Context • The integration of sensorimotor signals and prior beliefs contribute to our sense of body. An influential framework in the study of the bodily self is Gallagher's distinction between body image and body schema, which are roughly comparable to the perceived body and the lived body, respectively. Through systematic manipulations of sensorimotor signals, it is possible to induce the illusion of agency or ownership over foreign limbs or full bodies. Yet, there is diverging empirical evidence regarding the coherence of sensorimotor signals necessary to elicit such illusions. > P roblem • The large amount of empirical evidence and its relation to the concepts of body image and schema is not well understood and requires more fine-graded distinctions of various aspects of sensorimotor coherences. > Method • We systematically discuss literature on sensorimotor coherence during bodily illusions and argue for the importance of distinguishing between head- and limb-related coherences. To support this discussion, we present new experimental findings where participants experienced a first-person perspective (1PP) full-body illusion over another human through the manipulation of hand-related visuotactile or visuomotor coherence. > R esults • Participants showed no significant reduction in ownership after asynchronous visuotactile, but after asynchronous visuomotor stimulation. Based on these results and the literature, we propose that head-related temporal sensorimotor coherences are necessary to integrate limb-related incoherent signals during full-body illusions. Furthermore, we speculate that during full-body illusions, head-related coherences are a binding factor between the body image and the body schema; that is, only through the coherent manipulation of the visual field over a 1PP resulting from an immersive image (body image) is our body schema manipulated. > I mplications • While yet to be experimentally tested, distinguishing head- and limb-related sensorimotor integration and their influences on body image and body schema could refine the study of the bodily self. > Constructivist content • The plasticity of the bodily self - as shown in bodily illusions - reflects the dynamism of the subject as observer and its binding to its environment.

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Language(s): eng - English
 Dates: 2018-11-15
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.5167/uzh-162795
 Degree: -

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Project name : Plasticity of the bodily self in a life span approach
Grant ID : PP00P1_170511
Funding program : -
Funding organization : Swiss National Science Foundation

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Title: Constructivist Foundations
Source Genre: Journal
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Publ. Info: Brussels : Vrije Universiteit
Pages: - Volume / Issue: 14 (1) Sequence Number: - Start / End Page: 94 - 105 Identifier: ISSN: 1782-348X
CoNE: https://pure.mpg.de/cone/journals/resource/1782-348X