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Paired Stimulation for Spike-Timing-Dependent Plasticity in Primate Sensorimotor Cortex.

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The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 18, 2017
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Researchers induced spike-timing-dependent plasticity (STDP) in awake monkeys using paired electrical stimulation. This demonstrates a viable in vivo method for modifying cortical connections, crucial for injury recovery.

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Area of Science:

  • Neuroscience
  • Neurophysiology
  • Computational Neuroscience

Background:

  • Spike-timing-dependent plasticity (STDP) is a cellular mechanism where synaptic strength changes based on the precise timing of pre- and post-synaptic neuron firing.
  • Previous in vitro studies established STDP, and in vivo studies suggested behavioral relevance, often relying on single-unit recordings.
  • Modifying cortical connections is vital for recovery after injury, but in vivo methods avoiding complex single-unit isolation are needed.

Purpose of the Study:

  • To test if prolonged paired electrical stimulation can induce STDP in the sensorimotor cortex of awake, behaving nonhuman primates.
  • To quantify STDP induction using cortical evoked potentials (EPs) as a direct measure of population-level plasticity.
  • To investigate the feasibility of using paired stimulation as a tool for in vivo cortical plasticity modulation.

Main Methods:

  • Paired electrical stimulation was applied between two interconnected cortical sites in awake, behaving monkeys.
  • Cortical evoked potentials (EPs) were recorded to measure changes in synaptic strength and network excitability.
  • The study analyzed the effects of stimulation timing and site-specific connectivity on plasticity induction.

Main Results:

  • Paired stimulation induced robust effects consistent with STDP in EPs for a subset (2/15) of tested cortical pairs.
  • The stimulation protocol frequently led to increased global network excitability or depression of the specifically conditioned pair.
  • Plasticity effects were site-dependent, indicating that not all interconnected cortical areas responded uniformly to the stimulation.

Conclusions:

  • Paired electrical stimulation in vivo is a viable method for inducing STDP between cortical populations.
  • Cortical architecture and site-specific factors significantly influence the success of plasticity induction, beyond mere activation timing.
  • These findings bridge in vitro STDP mechanisms with in vivo population-level plasticity, offering potential for therapeutic interventions in neurological injury.