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Propagation of Action Potentials

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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.
Neurons (nerve cells) have a resting membrane potential, with a slightly negative charge inside compared to outside. This is maintained by ion channels, such as sodium (Na+) and potassium (K+) channels, which control the flow of ions. When a stimulus, like a touch or a signal from another neuron, triggers the neuron, sodium channels open, allowing sodium ions to...

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Related Experiment Video

Updated: Jun 17, 2026

Statistical Modelling of Cortical Connectivity Using Non-invasive Electroencephalograms

Statistical Modelling of Cortical Connectivity Using Non-invasive Electroencephalograms

Published on: November 1, 2019

Coherence potentials: loss-less, all-or-none network events in the cortex.

Tara C Thiagarajan¹, Mikhail A Lebedev, Miguel A Nicolelis

¹Section on Critical Brain Dynamics, National Institute of Mental Health, Bethesda, Maryland, United States of America.

|January 20, 2010

Summary

This summary is machine-generated.

New research reveals

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Area of Science:

Neuroscience
Computational Neuroscience

Background:

Transient neuronal associations are crucial for memory and behavior.
Mechanisms of neuronal association formation and identification remain unclear.

Purpose of the Study:

To investigate the mechanisms underlying the formation and identification of neuronal associations.
To characterize novel electrophysiological phenomena related to neuronal communication.

Main Methods:

Recorded local field potential (LFP) activity from multiple cortical sites in awake monkeys and organotypic cortical cultures.
Analyzed LFP patterns to identify synchronized neuronal activity and information transmission.

Main Results:

Identified large-amplitude LFPs, termed 'coherence potentials', that propagate across cortical sites via fast synaptic transmission.
Coherence potentials represent periods of lossless information spread, similar to action potentials but with diverse waveforms.
Waveform diversity in coherence potentials offers a high-dimensional parameter for encoding information and identifying specific neuronal associations.

Conclusions:

Coherence potentials provide a novel mechanism for information encoding and transmission across neuronal populations.
These findings offer insights into how the brain forms and identifies transient neuronal associations underlying cognitive functions.
The nonlinear spread of coherence potentials is analogous to information diffusion in social networks.