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Related Concept Videos

Action Potential: Phases of Stimulation01:28

Action Potential: Phases of Stimulation

The action potential is a complex electrical event that occurs in excitable cells, such as neurons and muscle cells. It consists of several distinct phases, each with specific characteristics.
Resting Phase:
In this phase, the cell's membrane is at its resting potential, typically around -70 millivolts (mV) for neurons. Inside the cell, there is a higher concentration of potassium ions (K+) and a lower concentration of sodium ions (Na+). Voltage-gated sodium channels are closed, and...
Resting Potential Decay01:15

Resting Potential Decay

The resting membrane potential of a neuron (-70mV) is sustained due to the selective ion permeability of the membrane. At the resting potential, the membrane is slightly permeable to ions like sodium (Na+) and chloride (Cl−) and highly permeable to potassium ions (K+). Differences in the ions' concentration inside the cell compared to the outside are maintained by membrane transport proteins like channels and pumps.
At rest, the K+ is the main ion that moves across the membrane through...
Resting Potential Decay01:15

Resting Potential Decay

The resting membrane potential of a neuron (-70mV) is sustained due to the selective ion permeability of the membrane. At the resting potential, the membrane is slightly permeable to ions like sodium (Na+) and chloride (Cl−) and highly permeable to potassium ions (K+). Differences in the ions' concentration inside the cell compared to the outside are maintained by membrane transport proteins like channels and pumps.
At rest, the K+ is the main ion that moves across the membrane through...
Action Potentials01:41

Action Potentials

Overview
Propagation of Action Potentials01:23

Propagation of Action Potentials

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...
Excitatory and Inhibitory Effects of Neurotransmitters01:29

Excitatory and Inhibitory Effects of Neurotransmitters

When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical synapse. The released neurotransmitter can be excitatory or inhibitory. The critical criteria commonly used to determine whether a molecule is a neurotransmitter at a chemical synapse are the molecule's presence in the presynaptic neuron. Second, its release is in response to strong presynaptic depolarization. And lastly, the presence of specific...

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Related Experiment Video

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Real-time Electrophysiology: Using Closed-loop Protocols to Probe Neuronal Dynamics and Beyond
08:08

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Published on: June 24, 2015

A novel phase portrait for neuronal excitability.

Guillaume Drion1, Alessio Franci, Vincent Seutin

  • 1Neurophysiology Unit and GIGA Neurosciences, University of Liège, Liège, Belgium.

Plos One
|August 21, 2012
PubMed
Summary

The FitzHugh-Nagumo model was revised to include calcium channels, enhancing its ability to model neuronal excitability and firing patterns. This updated model better captures essential electrophysiological signatures, improving neural modeling capabilities.

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Area of Science:

  • Computational Neuroscience
  • Mathematical Biology

Background:

  • The FitzHugh-Nagumo model, a simplified representation of neuronal excitability, has been a cornerstone in neural modeling for decades.
  • Classical models often overlook the significant role of calcium channels in neuronal firing mechanisms.

Purpose of the Study:

  • To revise the FitzHugh-Nagumo phase portrait by incorporating calcium channel dynamics.
  • To enhance the reduced modeling of neural excitability and capture complex firing patterns more accurately.

Main Methods:

  • Incorporation of calcium channel current into the Hodgkin-Huxley dynamics.
  • Analysis of the revised FitzHugh-Nagumo phase portrait to understand its impact on neural excitability.

Main Results:

  • The revised model fundamentally alters the FitzHugh-Nagumo phase portrait, expanding its modeling power.
  • The new model captures essential electrophysiological signatures without non-physiological alterations or complexification.
  • Demonstrated a dynamical mechanism by which calcium channels control distinct firing modes in thalamocortical neurons.

Conclusions:

  • Including calcium channels in neural models offers a more comprehensive understanding of neuronal excitability.
  • The revisited FitzHugh-Nagumo model provides a powerful and more accurate framework for studying neural firing patterns.
  • This approach highlights the critical role of calcium channels in diverse neuronal functions, such as thalamocortical neuron firing modes.