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Seeing or not seeing where your hands are.
1Department of Psychology, University of Bologna, Italy. ladavas@psibo.unibo.it
Experimental Brain Research
|May 10, 2000
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.
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.