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Related Experiment Videos

Seeing or not seeing where your hands are.

E Làdavas1, A Farnè, G Zeloni

  • 1Department of Psychology, University of Bologna, Italy. ladavas@psibo.unibo.it

Experimental Brain Research
|May 10, 2000
PubMed
Summary

Seeing your hand is crucial for how vision influences touch perception in your personal space. Preventing hand vision weakens this cross-modal interaction, suggesting vision, not proprioception, is key.

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Area of Science:

  • Neuroscience
  • Sensory Perception
  • Human Motor Control

Background:

  • Vision modulates tactile perception within a 'visual peripersonal space' near the hand.
  • This effect is stronger when visual stimuli are close to the hand.

Purpose of the Study:

  • To investigate if proprioception or direct sensory interaction mediates cross-modal links between vision and touch.
  • To determine the role of hand visibility in shaping visual modulation of tactile perception.

Main Methods:

  • Cross-modal effects were compared in two experiments: one with hand visibility, one without.
  • Participants' tactile perception was assessed under varying visual stimulus conditions near the hand.

Main Results:

  • Strong visual modulation of touch occurred when hands were visible near the stimulus.
  • Mild modulatory effects were observed when hand vision was prevented.
  • Proprioceptive signals did not appear relevant to this cross-modal interaction.

Conclusions:

  • Visual input of the hand is essential for establishing the spatial mapping between vision and touch in peripersonal space.
  • Bimodal neurons in premotor and parietal cortex likely underpin these effects, with responsiveness dependent on body part visibility.

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