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Related Experiment Videos

Bodily illusions modulate tactile perception.

Frédérique de Vignemont1, Henrik H Ehrsson, Patrick Haggard

  • 1Institute of Cognitive Neuroscience and Department of Psychology, University College London, 17 Queen Square, London WC1N3 AR, United Kingdom. fvignemont@isc.cnrs.fr

Current Biology : CB
|July 30, 2005
PubMed
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Proprioception, the sense of body position, influences touch perception. Our study shows that altering the perceived size of a finger through proprioceptive illusions changes how tactile distances are felt.

Area of Science:

  • Neuroscience
  • Somatosensation
  • Body Representation

Background:

  • Touch perception is unique as the body is part of the tactile experience.
  • Proprioception and touch interactions offer insights into implicit body representations.

Purpose of the Study:

  • To investigate how the perceived size of a body part affects tactile perception of object properties.
  • To demonstrate that tactile object qualities, like size, are modulated by body representation.

Main Methods:

  • Elicited proprioceptive illusions of finger elongation/shrinking via tendon vibration.
  • Subjects estimated tactile distances on the modified finger.
  • Controlled for non-illusory vibration effects.

Main Results:

Related Experiment Videos

  • Tactile distances were perceived as larger when the finger felt elongated.
  • This effect was directly linked to the induced proprioceptive illusion of finger size.
  • Vibrations without illusion did not alter tactile perception.

Conclusions:

  • Tactile object perception is anchored to an implicit body representation.
  • Proprioception plays a crucial role in shaping this body representation.
  • Provided a novel quantitative measure for body size distortions.