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Related Experiment Video

Updated: Jan 5, 2026

In Vivo Intracellular Recording of Type-Identified Rat Spinal Motoneurons During Trans-Spinal Direct Current Stimulation
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In Vivo Intracellular Recording of Type-Identified Rat Spinal Motoneurons During Trans-Spinal Direct Current Stimulation

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Cervical trans-spinal direct current stimulation: a modelling-experimental approach.

Sofia Rita Fernandes1,2, Mariana Pereira3, Ricardo Salvador4

  • 1Instituto de Fisiologia, Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Avenida Professor Egas Moniz, 1649-028, Lisbon, Portugal. srcfernandes@fc.ul.pt.

Journal of Neuroengineering and Rehabilitation
|October 27, 2019
PubMed
Summary
This summary is machine-generated.

Computational models identified the C3-T3 electrode montage as optimal for maximizing electric field delivery during cervical trans-spinal direct current stimulation (tsDCS). This montage showed polarity-dependent effects on motor responses, suggesting improved spinal motor modulation.

Keywords:
CervicalComputational modelingDirect current stimulationNeuromodulationSpinal cord

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Computational Modeling

Background:

  • Trans-spinal direct current stimulation (tsDCS) is a non-invasive neuromodulatory technique targeting spinal cord (SC) circuitry.
  • Computational modeling is crucial for optimizing tsDCS protocols for clinical applications.
  • This study aimed to identify the optimal electrode montage for cervical tsDCS using combined modeling and experimental approaches.

Purpose of the Study:

  • To determine the electrode montage that maximizes electric field (E-field) delivery in the cervical spinal cord during tsDCS.
  • To investigate the neuromodulatory effects of the optimal tsDCS montage on upper limb motor and sensory pathways.

Main Methods:

  • Human realistic computational models were used to predict current and E-field distributions for four electrode montages.
  • A double-blind, randomized crossover study in 10 healthy subjects applied tsDCS using the optimal montage (C3-T3).
  • Motor evoked potentials (MEP), sensory evoked potentials (SEP), M-waves, H-reflex, and F-wave responses were analyzed to assess neurophysiological changes.

Main Results:

  • The C3-T3 electrode montage yielded the highest E-field magnitude in the cervical SC.
  • Significant changes in N9 SEP latency and MEP latency/central motor conduction time (CMCT) were observed with the C3-T3 montage.
  • Pairwise comparisons revealed significant differences between sham and cathodal conditions for MEP latency and CMCT.

Conclusions:

  • Computational modeling successfully identified the C3-T3 montage for enhanced cervical tsDCS E-field delivery.
  • The C3-T3 montage demonstrated polarity-dependent modulation of spinal motor responses.
  • Modeling-guided tsDCS protocol design is recommended to improve the effectiveness of spinal neuromodulation.