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Higher-level brain areas represent action types, like tool use, independent of the body part used. This abstract action representation develops even without hand experience, showing motor system flexibility.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Cognitive Neuroscience

Background:

  • The sensorimotor system is organized somatotopically, but higher-level areas encode action types irrespective of the body part.
  • It remains unclear if this body-part independence extends to newer actions like tool use.
  • Investigating tool use in individuals with congenital handlessness can clarify the role of manual experience.

Purpose of the Study:

  • To determine if the brain represents tool-use actions independently of the acting body part (hands vs. feet).
  • To examine if sensorimotor experience with hands is essential for developing body-part-independent action representations.
  • To understand the hierarchical organization of the motor system for action representation.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
  • Participants performed tool-use actions with their hands and feet.
  • The study included individuals with and without congenital handlessness.

Main Results:

  • Primary sensorimotor cortices showed body-part specific information for both groups.
  • Higher-level motor areas in the tool-use network displayed abstract, body-part-independent action-type information.
  • Functional reorganization in congenital handlessness mirrored intact cortex organization, indicating plasticity limits.

Conclusions:

  • The hierarchical organization of the motor system for action representation is not dependent on evolutionary history or individual manual experience.
  • This abstract coding in higher motor areas supports generalization across different body parts for action execution.
  • Findings suggest potential for using abstract action codes in hierarchical brain-computer interfaces.