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Vision influences tactile perception without proprioceptive orienting

S P Tipper1, D Lloyd, B Shorland

  • 1University of Wales, Bangor, UK.

Neuroreport
|July 17, 1998
PubMed
Summary
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Looking at a body part enhances touch perception, even without proprioceptive cues. This study shows that visual information alone can improve somatosensation, demonstrating a direct link between sight and touch.

Area of Science:

  • Neuroscience
  • Somatosensation
  • Human sensory perception

Background:

  • Tactile perception is enhanced when attention is directed towards the stimulated body site.
  • This enhancement occurs even in the absence of visual information, suggesting a role for proprioception.
  • It remains unclear if visual input itself, independent of proprioceptive orienting, contributes to tactile facilitation.

Purpose of the Study:

  • To investigate whether visual information of a body part can facilitate somatosensation independently of proprioceptive orienting.
  • To dissociate the effects of vision and proprioception on tactile perception.

Main Methods:

  • An experiment was designed to separate visual input from proprioceptive orienting.
  • Participants' tactile perception was assessed under conditions manipulating visual and proprioceptive cues.

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Main Results:

  • Vision of a body part was shown to facilitate somatosensation.
  • This facilitation occurred independently of proprioceptive orienting of the eye and head.
  • This provides the first evidence for vision's independent effect on touch.

Conclusions:

  • Visual information directed at a body part can enhance tactile perception.
  • This visual facilitation of somatosensation is distinct from proprioceptive contributions.
  • The findings highlight a direct influence of vision on the processing of tactile stimuli.