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A simple method to stand outside oneself.

Eric Lewin Altschuler1, Vilayanur S Ramachandran

  • 1Brain and Perception Laboratory, University of California at San Diego, La Jolla 92093-0109, USA. eric.altschuler@umdnj.edu

Perception
|June 15, 2007
PubMed
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A simple two-mirror method reveals that aligning vision with touch and proprioception is key to self-perception. This technique may also decouple taste from physical sensations and actions.

Area of Science:

  • Neuroscience
  • Perception Science
  • Psychophysics

Background:

  • The sense of self, or corporeal self, is constructed from multisensory integration.
  • Understanding the specific sensory inputs critical for self-perception remains an active area of research.

Purpose of the Study:

  • To introduce a straightforward experimental method using mirrors to investigate the perception of the corporeal self.
  • To determine the role of visual-somatosensory integration in body ownership.
  • To explore the potential for dissociating gustatory perception from other sensory modalities.

Main Methods:

  • A simple setup employing two mirrors was devised to create an out-of-body experience.
  • Participants' perception of self and body ownership was assessed under manipulated visual-somatosensory feedback conditions.

Related Experiment Videos

  • The method allowed for the examination of taste perception independent of touch, proprioception, and movement.

    • Main Results:

    • The experimental method successfully induced a sensation of disembodiment, allowing individuals to perceive themselves as if from an external viewpoint.
    • The findings underscore the critical role of congruent visual, tactile, and proprioceptive information in maintaining a coherent sense of the corporeal self.
    • Preliminary results suggest the potential to dissociate the experience of taste from concurrent tactile, proprioceptive, and motor feedback.

    Conclusions:

    • The two-mirror technique provides a novel and accessible tool for studying body ownership and self-perception.
    • Multisensory integration, particularly the registration of vision with touch and proprioception, is fundamental for the perception of the corporeal self.
    • This method opens avenues for further research into sensory dissociation, including the decoupling of taste from other bodily sensations.