Children's responses to the rubber-hand illusion reveal dissociable pathways in body representation

Area of Science:

• Neuroscience
• Developmental Psychology
• Body Representation

Background:

• The sense of self arises from integrating multisensory information.
• The developmental trajectory of multisensory integration and its link to self-perception remains unclear.

Purpose of the Study:

• To investigate the relationship between multisensory development and the emerging sense of self in children.
• To determine the maturation timeline of distinct sensory pathways contributing to body representation.

Main Methods:

• The rubber-hand illusion was employed to assess body ownership and hand position perception.
• Intermanual pointing tasks were used to measure sensitivity to visual-tactile synchrony.
• Comparisons were made between young children (4-9 years) and adults.

Main Results:

• Children (4-9 years) and adults showed equal sensitivity to visual-tactile synchrony, indicating early maturation of this pathway.
• Children exhibited a stronger illusion (perceived hand position closer to the rubber hand) than adults, irrespective of synchrony.
• This suggests a second, later-maturing process involving visual-proprioceptive information.

Conclusions:

• Two distinct processes underpin body representation: an early-maturing visual-tactile pathway and a later-maturing visual-proprioceptive pathway.
• Explicit feelings of embodiment are linked to the visual-tactile process.
• Findings challenge current adult models of body representation and ownership, highlighting developmental dissociations.