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Related Experiment Videos

Spike initiation by transmembrane current: a white-noise analysis

H L Bryant, J P Segundo

    The Journal of Physiology
    |September 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

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    This study reveals that specific transmembrane current patterns reliably trigger action potentials in Aplysia neurons. Statistical analysis identified key current features, like slope and acceleration, crucial for spike initiation.

    Area of Science:

    • Neuroscience
    • Computational Neuroscience
    • Electrophysiology

    Background:

    • Understanding action potential initiation is fundamental to neuroscience.
    • Neuronal excitability is governed by transmembrane currents.
    • Previous studies often used limited stimulus patterns, potentially missing diverse triggers.

    Purpose of the Study:

    • To characterize the transmembrane current features that reliably initiate action potentials (spikes) in Aplysia neurons.
    • To investigate the reliability and waveform diversity preceding spike initiation.
    • To determine the role of stimulus dynamics and bias in spike triggering.

    Main Methods:

    • Utilized Gaussian white-noise current stimulation in Aplysia neurons.
    • Employed statistical analysis, including probability densities and correlation coefficients, of preceding current waveforms.

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  • Examined the influence of direct current (d.c.) bias on current trajectories.

    • Main Results:

    • Neuronal firing times showed remarkable invariance, indicating high response reliability.
    • A wide variety of current waveforms could precede spikes, but an average multiphasic trajectory was identified.
    • The average current trajectory featured an early phase opposing d.c. bias and a late outward phase peaking before the action potential.
    • Current slope and acceleration were critical in the 200 ms before spike triggering, especially under depolarizing bias.

    Conclusions:

    • Transmembrane current dynamics, particularly slope and acceleration, play a crucial role in spike initiation.
    • Despite waveform diversity, a preferred average current trajectory appears to guide spike triggering.
    • The findings provide insights into the statistical properties of neuronal excitability and spike generation mechanisms.