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Somatosensation alone, without vision, can lead to tool embodiment. Blindfolded participants showed changes in arm movement kinematics after using a tool, suggesting their arm representation expanded implicitly.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Human Motor Control

Background:

  • Tool use alters body representations and peripersonal space, a phenomenon known as tool embodiment.
  • Previous studies often combined vision and somatosensation, leaving the role of somatosensation alone in tool embodiment unclear.

Purpose of the Study:

  • To investigate whether somatosensation alone is sufficient for tool embodiment.
  • To assess implicit changes in arm length representation following tool use in blindfolded individuals.

Main Methods:

  • Participants (healthy, blindfolded) grasped an object before and after tool use.
  • Movement kinematics (arm transport, hand grip) were analyzed to assess implicit arm length representation.
  • Control experiments were conducted to rule out alternative explanations.

Main Results:

  • Tool use led to longer latencies and smaller peak velocities in arm transport, indicating an expanded arm representation.
  • No significant changes were observed in the hand grip component.
  • Effects were specific to implicit arm representation, with no changes in explicit forearm length estimates.

Conclusions:

  • Somatosensory input alone is sufficient for tool embodiment, even with novel, unseen tools.
  • Tool use can implicitly alter body representations, specifically the perceived length of the arm.
  • Findings highlight the brain's capacity to integrate sensory information for body schema adaptation.