Modulation of Bodily Self-Consciousness by Self and External Touch

The full body illusion (FBI) is a bodily illusion based on the application of multisensory conflicts inducing changes in bodily self-consciousness (BSC), which has been used to study cognitive brain mechanisms underlying body ownership and related aspects of self-consciousness. Typically, such paradigms have employed external passive multisensory stimulation, thus neglecting possible contributions of self-generated action and haptic cue to body ownership. The present paper examined the effects of both external and voluntary self-touch on the BSC with a robotics-based FBI paradigm. We compared the effects of classical passive visuo-tactile stimulation and active self-touch (in which experimental participants have the sense of agency over the tactile stimulation) on the FBI. We evaluated these effects by a questionnaire, a crossmodal congruency task, and measurements of changes in self-location. The results indicated that both the synchronous passive visuo-tactile stimulation and synchronous active self-touch induced illusory ownership over a virtual body, without significant differences in their magnitudes. However, the FBI induced by the active self-touch was associated with larger drift in self-location towards the virtual body. These results show that movement-related signals arising from self-touch impact the BSC not only for hand ownership, but also for torso-centered body ownership and related aspects of BSC.

À propos de ce résultat

Cette page est générée automatiquement et peut contenir des informations qui ne sont pas correctes, complètes, à jour ou pertinentes par rapport à votre recherche. Il en va de même pour toutes les autres pages de ce site. Veillez à vérifier les informations auprès des sources officielles de l'EPFL.

Olaf Blanke, Roy Salomon, Masayuki Hara, Noriaki Kanayama
2021
Article

Résumé

Source officielle

https://infoscience.epfl.ch/record/287172?ln=fr

À propos de ce résultat

Concepts associés (3)

Multisensory integration

Multisensory integration, also known as multimodal integration, is the study of how information from the different sensory modalities (such as sight, sound, touch, smell, self-motion, and taste) may be integrated by the nervous system. A coherent representation of objects combining modalities enables animals to have meaningful perceptual experiences. Indeed, multisensory integration is central to adaptive behavior because it allows animals to perceive a world of coherent perceptual entities.

Self-consciousness

Self-consciousness is a heightened sense of awareness of oneself. It is not to be confused with consciousness in the sense of qualia. Historically, "self-consciousness" was synonymous with "self-awareness", referring to a state of awareness that one exists and that one has consciousness. While "self-conscious" and "self-aware" are still sometimes used interchangeably, particularly in philosophy, self-consciousness is now also commonly used to refer to a preoccupation with oneself, especially with how others might perceive one's appearance or one's actions.

Illusion

vignette|La « tête sur un plat », une attraction du musée régional des sciences de Bophal, en Inde, en 2012. Une illusion (du latin illusio) est une perception qui diffère de la réalité considérée comme objective. Dans le domaine de la pensée, l'illusion d'un individu est une conception erronée, une croyance, causée par un jugement biaisé ou un raisonnement incorrect. La désillusion est le sentiment que ce que nous avons perçu ou compris dément la façon, généralement optimiste, dont nous percevions les choses auparavant.