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The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
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Can Neural Activity Propagate by Endogenous Electrical Field?

Chen Qiu1, Rajat S Shivacharan1, Mingming Zhang1

  • 1Department of Biomedical Engineering, Neural Engineering Center, Case Western Reserve University, Cleveland, Ohio 44106.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|December 4, 2015
PubMed
Summary

Neural electric fields, not synapses, drive signal propagation at ~0.1 m/s. This study demonstrates endogenous electric fields are sufficient for neural wave propagation, impacting understanding of both normal and pathological brain activity.

Keywords:
epilepticalfield effectneural propagationosmolarity

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Biophysics

Background:

  • Synaptic transmission and gap junctions are primary neural signal mechanisms.
  • A subset of neural waves propagate at ~0.1 m/s independent of these known pathways.
  • Axonal conduction and ionic diffusion speeds do not align with observed wave propagation.

Purpose of the Study:

  • To test the hypothesis that endogenous electric fields alone mediate neural signal propagation.
  • To investigate the role of electric field effects in neural wave speed and amplitude.
  • To explore the biophysical parameters influencing electric field-mediated propagation.

Main Methods:

  • In silico modeling of neuronal networks to simulate electric field effects.
  • In vitro electrophysiological recordings in mouse hippocampi.
  • Osmolarity experiments to manipulate cell-to-cell distances.
  • Application of blocking electric fields to assess propagation disruption.

Main Results:

  • Simulations showed electric fields alone mediate propagation at 0.11-0.12 m/s with weak field amplitudes (2-6 mV/mm).
  • In vitro experiments confirmed similar speeds (0.10 m/s) and amplitudes (2.5-5 mV/mm) in mouse hippocampi.
  • Propagation speed was inversely proportional to cell-to-cell distance, consistent with model predictions.
  • Blocking electric fields significantly reduced propagation speed.

Conclusions:

  • Endogenous electric fields are sufficient to explain neural signal propagation at ~0.1 m/s.
  • This electric field effect is independent of synaptic transmission and gap junctions.
  • The findings offer a new mechanism for understanding slow physiological and pathological neural activity, such as epileptic propagation.