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Motor augmentation with a robotic thumb enhanced control and embodiment. However, this led to altered neural representations and motor control of the biological hand.

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Area of Science:

  • Neuroscience
  • Robotics
  • Human-Computer Interaction

Background:

  • Human augmentation is a long-standing fascination, relying on technological advancement and the brain's adaptability.
  • Understanding the neural implications of integrating assistive devices is crucial for future human augmentation.

Purpose of the Study:

  • To investigate the feasibility of motor augmentation using an extra robotic thumb (Third Thumb).
  • To examine the impact of using the Third Thumb on the neural representation and function of the biological hand.

Main Methods:

  • Able-bodied participants trained for 5 days with a robotic Third Thumb in lab and daily settings.
  • Behavioral and brain imaging (fMRI) tests assessed motor control, embodiment, and neural hand representation before and after training.

Main Results:

  • Training improved Third Thumb control, dexterity, and hand-robot coordination, even under increased cognitive load or visual occlusion.
  • Participants reported increased embodiment of the Third Thumb.
  • Third Thumb use weakened biological hand kinematic synergies and led to a mild collapse in the augmented hand's motor representation.

Conclusions:

  • Motor augmentation with a robotic thumb is achievable, offering flexible use and enhanced embodiment.
  • Augmentation can alter biological hand representation and motor control, with potential neurocognitive consequences.
  • These findings are critical for the successful implementation of future augmentation technologies.