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Plastic changes in primate motor cortex following paired peripheral nerve stimulation.

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Paired peripheral nerve stimulation alters motor cortex excitability. Asynchronous stimulation enhances task performance and neural encoding, while synchronous stimulation impairs them, showing timing-dependent plasticity.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Neuroplasticity

Background:

  • Peripheral nerve stimulation can induce lasting changes in motor cortical excitability.
  • The precise neuronal mechanisms underlying these changes remain largely unknown.

Purpose of the Study:

  • To investigate the effects of synchronous and asynchronous paired peripheral nerve stimulation on motor cortical activity and behavior.
  • To determine if stimulus timing influences neuroplasticity in the motor cortex.

Main Methods:

  • Two macaque monkeys performed selective finger abduction tasks.
  • Neural activity was recorded from the primary motor cortex.
  • Synchronous or asynchronous paired ulnar/median nerve stimulation was applied for 1 hour.
  • Linear discriminant analysis decoded nerve stimulation and digit movement.

Main Results:

  • Asynchronous stimulation enhanced task performance and neural response amplitude, while synchronous stimulation impaired performance and altered neural activity patterns.
  • Decoding accuracy for nerve stimulation improved after asynchronous and decreased after synchronous stimulation.
  • Synchronous stimulation altered motor cortex activity during specific finger movements.

Conclusions:

  • Paired peripheral nerve stimulation induces lasting, timing-dependent changes in motor cortical circuits.
  • These neuroplastic changes can modulate behavioral performance and the neural encoding of sensory and motor information.
  • Non-invasive peripheral nerve stimulation techniques can effectively alter central motor circuits.