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Statistical study on reverberation between two mutually excitatory neuron groups.

Y Kitatsuji, T Kuroda

    Journal of Theoretical Biology
    |January 7, 1983
    PubMed
    Summary
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    This study models reverberation between neuron groups, finding that summed excitatory post-synaptic potentials (EPSPs) and neural noise determine the firing threshold. Relative refractory periods slightly slow firing activity increases.

    Area of Science:

    • Computational Neuroscience
    • Theoretical Neuroscience
    • Neural Dynamics

    Background:

    • Neural reverberation is crucial for cognitive functions.
    • Understanding the factors influencing firing activity in connected neuron groups is essential.
    • Existing models may not fully capture the interplay of synaptic potentials, noise, and refractoriness.

    Purpose of the Study:

    • To theoretically investigate reverberation between two neuron groups with random excitatory connections.
    • To model the effects of excitatory post-synaptic potential (EPSP) summation, spontaneous neural firing (noise), and relative refractory periods on neural firing.
    • To explain observed firing patterns in reverberating systems.

    Main Methods:

    • Development of a theoretical model neuron capturing key characteristics of real neurons.

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  • Inclusion of three primary effects: EPSP summation, spontaneous firing as noise, and the relative refractory period.
  • Analysis of how these factors influence the systematic threshold (p theta) and firing activity increase (pi).

    • Main Results:

    • The model demonstrates that EPSP summation and neural noise lead to a systematic threshold (p theta) consistent with experimental observations.
    • The relative refractory period was found to slightly suppress the speed of firing activity increase (pi) in the reverberating system.
    • Increasing the strength of the refractory effect further suppresses the firing activity increase (pi).

    Conclusions:

    • The interplay of EPSP summation and neural noise is critical in establishing the firing threshold in reverberating neuron networks.
    • While relative refractoriness influences firing rate, it alone cannot fully account for the rapid initial increase in firing activity observed experimentally.
    • Further investigation may be needed to explain the high-speed initial firing increase in reverberating systems.