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Restoring continuous finger function with temporarily paralyzed nonhuman primates using brain-machine interfaces.

Samuel R Nason-Tomaszewski1, Matthew J Mender1, Eric Kennedy1

  • 1Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109, United States of America.

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Summary
This summary is machine-generated.

Brain-controlled functional electrical stimulation (BCFES) restored continuous finger control in a temporarily paralyzed monkey. This brain-machine interface (BMI) technology shows promise for neuroprosthetics, suggesting brain control is not the primary limitation.

Keywords:
brain–machine interfacefingerfunctional electrical stimulation

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Rehabilitation Technology

Background:

  • Brain-machine interfaces (BMIs) show potential for restoring upper extremity function.
  • Functional electrical stimulation (FES) has restored discrete grasps, but continuous finger movement control remains challenging.
  • Low-power brain-controlled functional electrical stimulation (BCFES) systems offer a new avenue for restoring volitional movement.

Purpose of the Study:

  • To investigate the efficacy of a BCFES system in restoring continuous finger position control in a nonhuman primate with temporary paralysis.
  • To assess the performance of a closed-loop BMI in controlling both FES-driven finger movements and virtual finger movements.
  • To determine if BMI performance can be recovered after temporary paralysis through recalibrated feedback-intention training.

Main Methods:

  • Simulated temporary paralysis by applying a nerve block to the median, radial, and ulnar nerves.
  • Utilized a closed-loop BMI to predict intended finger movements.
  • Controlled FES of finger muscles in a one-dimensional task and virtual finger movements in a two-dimensional task.

Main Results:

  • The monkey achieved an 83% success rate with BCFES, a significant improvement from 8.8% during paralysis without BCFES.
  • Median acquisition time decreased from 9.5 seconds to 1.5 seconds with BCFES.
  • BMI performance in a virtual two-finger task was fully recovered after paralysis with one session of recalibrated feedback-intention training.

Conclusions:

  • BCFES can effectively restore continuous finger function during temporary paralysis.
  • Existing low-power technologies are sufficient for BCFES neuroprostheses.
  • Brain control may not be the limiting factor in the development of BCFES neuroprosthetic systems.